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OpenFPGA/vpr7_x2p/vpr/SRC/fpga_x2p/verilog/verilog_mux.cpp

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developed subgraph extraction and start refactoring mux generation
2019-08-19 21:13:18 -05:00
/***********************************************
* This file includes functions to generate
* Verilog submodules for multiplexers.
* including both fundamental submodules
* such as a branch in a multiplexer
* and the full multiplexer
**********************************************/
rework on the circuit model ports and start prototyping mux Verilog generation
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#include <string>
implementing mux Verilog generation. Bugs detected, fixing ongoing
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#include <algorithm>
developed subgraph extraction and start refactoring mux generation
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#include "util.h"
#include "vtr_assert.h"
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/* Device-level header files */
#include "mux_graph.h"
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#include "module_manager.h"
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#include "physical_types.h"
#include "vpr_types.h"
bug fixing for datapath mux size in Verilog generation
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#include "mux_utils.h"
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/* FPGA-X2P context header files */
#include "spice_types.h"
#include "fpga_x2p_naming.h"
add missing files and try to refactor submodule essential
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#include "fpga_x2p_utils.h"
developed subgraph extraction and start refactoring mux generation
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rework on the circuit model ports and start prototyping mux Verilog generation
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/* FPGA-Verilog context header files */
#include "verilog_global.h"
#include "verilog_writer_utils.h"
renaming files
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#include "verilog_mux.h"
developed subgraph extraction and start refactoring mux generation
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refactored behavioral mux branch verilog generation
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/*********************************************************************
* Generate structural Verilog codes (consist of transmission-gates or
* pass-transistor) modeling an branch circuit
developed subgraph extraction and start refactoring mux generation
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* for a multiplexer with the given size
refactored behavioral mux branch verilog generation
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*********************************************************************/
static
void generate_verilog_cmos_mux_branch_body_structural(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const CircuitModelId& tgate_model,
const ModuleId& module_id,
const BasicPort& input_port,
const BasicPort& output_port,
const BasicPort& mem_port,
const BasicPort& mem_inv_port,
const MuxGraph& mux_graph) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Get the module id of tgate in Module manager */
ModuleId tgate_module_id = module_manager.find_module(circuit_lib.model_name(tgate_model));
VTR_ASSERT(ModuleId::INVALID() != tgate_module_id);
/* TODO: move to check_circuit_library? Get model ports of tgate */
std::vector<CircuitPortId> tgate_input_ports = circuit_lib.model_ports_by_type(tgate_model, SPICE_MODEL_PORT_INPUT, true);
std::vector<CircuitPortId> tgate_output_ports = circuit_lib.model_ports_by_type(tgate_model, SPICE_MODEL_PORT_OUTPUT, true);
VTR_ASSERT(3 == tgate_input_ports.size());
VTR_ASSERT(1 == tgate_output_ports.size());
/* Verilog Behavior description for a MUX */
print_verilog_comment(fp, std::string("---- Structure-level description -----"));
/* Output the netlist following the connections in mux_graph */
/* Iterate over the inputs */
for (const auto& mux_input : mux_graph.inputs()) {
BasicPort cur_input_port(input_port.get_name(), size_t(mux_graph.input_id(mux_input)), size_t(mux_graph.input_id(mux_input)));
/* Iterate over the outputs */
for (const auto& mux_output : mux_graph.outputs()) {
BasicPort cur_output_port(output_port.get_name(), size_t(mux_graph.output_id(mux_output)), size_t(mux_graph.output_id(mux_output)));
/* if there is a connection between the input and output, a tgate will be outputted */
std::vector<MuxEdgeId> edges = mux_graph.find_edges(mux_input, mux_output);
/* There should be only one edge or no edge*/
VTR_ASSERT((1 == edges.size()) || (0 == edges.size()));
/* No need to output tgates if there are no edges between two nodes */
if (0 == edges.size()) {
continue;
}
implementing mux Verilog generation. Bugs detected, fixing ongoing
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/* Output a tgate use a module manager */
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/* Create a port-to-port name map */
std::map<std::string, BasicPort> port2port_name_map;
/* input port */
port2port_name_map[circuit_lib.port_lib_name(tgate_input_ports[0])] = cur_input_port;
/* output port */
port2port_name_map[circuit_lib.port_lib_name(tgate_output_ports[0])] = cur_output_port;
/* Find the mem_id controlling the edge */
MuxMemId mux_mem = mux_graph.find_edge_mem(edges[0]);
BasicPort cur_mem_port(mem_port.get_name(), size_t(mux_mem), size_t(mux_mem));
BasicPort cur_mem_inv_port(mem_inv_port.get_name(), size_t(mux_mem), size_t(mux_mem));
/* mem port */
if (false == mux_graph.is_edge_use_inv_mem(edges[0])) {
/* wire mem to mem of module, and wire mem_inv to mem_inv of module */
port2port_name_map[circuit_lib.port_lib_name(tgate_input_ports[1])] = cur_mem_port;
port2port_name_map[circuit_lib.port_lib_name(tgate_input_ports[2])] = cur_mem_inv_port;
} else {
/* wire mem_inv to mem of module, wire mem to mem_inv of module */
port2port_name_map[circuit_lib.port_lib_name(tgate_input_ports[1])] = cur_mem_inv_port;
port2port_name_map[circuit_lib.port_lib_name(tgate_input_ports[2])] = cur_mem_port;
}
/* Output an instance of the module */
print_verilog_module_instance(fp, module_manager, module_id, tgate_module_id, port2port_name_map, circuit_lib.dump_explicit_port_map(tgate_model));
/* IMPORTANT: this update MUST be called after the instance outputting!!!!
* update the module manager with the relationship between the parent and child modules
*/
module_manager.add_child_module(module_id, tgate_module_id);
}
}
}
/*********************************************************************
* Generate behavior-level Verilog codes modeling an branch circuit
* for a multiplexer with the given size
*********************************************************************/
static
void generate_verilog_cmos_mux_branch_body_behavioral(std::fstream& fp,
const BasicPort& input_port,
const BasicPort& output_port,
const BasicPort& mem_port,
const MuxGraph& mux_graph,
const size_t& default_mem_val) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Verilog Behavior description for a MUX */
print_verilog_comment(fp, std::string("---- Behavioral-level description -----"));
/* Add an internal register for the output */
BasicPort outreg_port("out_reg", mux_graph.num_outputs());
/* Print the port */
fp << "\t" << generate_verilog_port(VERILOG_PORT_REG, outreg_port) << ";" << std::endl;
/* Generate the case-switch table */
fp << "\talways @(" << generate_verilog_port(VERILOG_PORT_CONKT, input_port) << ", " << generate_verilog_port(VERILOG_PORT_CONKT, mem_port) << ")" << std::endl;
fp << "\tcase (" << generate_verilog_port(VERILOG_PORT_CONKT, mem_port) << ")" << std::endl;
/* Output the netlist following the connections in mux_graph */
/* Iterate over the inputs */
for (const auto& mux_input : mux_graph.inputs()) {
BasicPort cur_input_port(input_port.get_name(), size_t(mux_graph.input_id(mux_input)), size_t(mux_graph.input_id(mux_input)));
/* Iterate over the outputs */
for (const auto& mux_output : mux_graph.outputs()) {
BasicPort cur_output_port(output_port.get_name(), size_t(mux_graph.output_id(mux_output)), size_t(mux_graph.output_id(mux_output)));
/* if there is a connection between the input and output, a tgate will be outputted */
std::vector<MuxEdgeId> edges = mux_graph.find_edges(mux_input, mux_output);
/* There should be only one edge or no edge*/
VTR_ASSERT((1 == edges.size()) || (0 == edges.size()));
/* No need to output tgates if there are no edges between two nodes */
if (0 == edges.size()) {
continue;
}
/* For each case, generate the logic levels for all the inputs */
/* In each case, only one mem is enabled */
fp << "\t\t" << mem_port.get_width() << "'b";
std::string case_code(mem_port.get_width(), default_mem_val);
/* Find the mem_id controlling the edge */
MuxMemId mux_mem = mux_graph.find_edge_mem(edges[0]);
/* Flip a bit by the mem_id */
if (false == mux_graph.is_edge_use_inv_mem(edges[0])) {
case_code[size_t(mux_mem)] = '1';
} else {
case_code[size_t(mux_mem)] = '0';
}
fp << case_code << ": " << generate_verilog_port(VERILOG_PORT_CONKT, outreg_port) << " <= ";
fp << generate_verilog_port(VERILOG_PORT_CONKT, cur_input_port) << ";" << std::endl;
}
}
/* Default case: outputs are at high-impedance state 'z' */
std::string default_case(mux_graph.num_outputs(), 'z');
fp << "\t\tdefault: " << generate_verilog_port(VERILOG_PORT_CONKT, outreg_port) << " <= ";
fp << mux_graph.num_outputs() << "'b" << default_case << ";" << std::endl;
/* End the case */
fp << "\tendcase" << std::endl;
/* Wire registers to output ports */
fp << "\tassign " << generate_verilog_port(VERILOG_PORT_CONKT, output_port) << " = ";
fp << generate_verilog_port(VERILOG_PORT_CONKT, outreg_port) << ";" << std::endl;
}
/*********************************************************************
* Generate Verilog codes modeling an branch circuit
refactored rram mux generation
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* for a CMOS multiplexer with the given size
refactored behavioral mux branch verilog generation
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* Support structural and behavioral Verilog codes
*********************************************************************/
developed subgraph extraction and start refactoring mux generation
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static
refactored behavioral mux branch verilog generation
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void generate_verilog_cmos_mux_branch_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const CircuitModelId& circuit_model,
const std::string& module_name,
const MuxGraph& mux_graph,
const bool& use_structural_verilog) {
rework on the circuit model ports and start prototyping mux Verilog generation
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/* Get the tgate model */
CircuitModelId tgate_model = circuit_lib.pass_gate_logic_model(circuit_model);
/* Skip output if the tgate model is a MUX2, it is handled by essential-gate generator */
if (SPICE_MODEL_GATE == circuit_lib.model_type(tgate_model)) {
VTR_ASSERT(SPICE_MODEL_GATE_MUX2 == circuit_lib.gate_type(tgate_model));
return;
}
add recursive global port searching for circuit library
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std::vector<CircuitPortId> tgate_global_ports = circuit_lib.model_global_ports_by_type(tgate_model, SPICE_MODEL_PORT_INPUT, true);
rework on the circuit model ports and start prototyping mux Verilog generation
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/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Generate the Verilog netlist according to the mux_graph */
/* Find out the number of inputs */
size_t num_inputs = mux_graph.num_inputs();
/* Find out the number of outputs */
size_t num_outputs = mux_graph.num_outputs();
/* Find out the number of memory bits */
size_t num_mems = mux_graph.num_memory_bits();
/* Check codes to ensure the port of Verilog netlists will match */
/* MUX graph must have only 1 output */
VTR_ASSERT(1 == num_outputs);
/* MUX graph must have only 1 level*/
VTR_ASSERT(1 == mux_graph.num_levels());
develop and plug mux_lib_builder, refactoring the mux submodule generation
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/* Create a Verilog Module based on the circuit model, and add to module manager */
ModuleId module_id = module_manager.add_module(module_name);
VTR_ASSERT(ModuleId::INVALID() != module_id);
/* Add module ports */
/* Add each global port */
for (const auto& port : tgate_global_ports) {
/* Configure each global port */
BasicPort global_port(circuit_lib.port_lib_name(port), circuit_lib.port_size(port));
module_manager.add_port(module_id, global_port, ModuleManager::MODULE_GLOBAL_PORT);
}
/* Add each input port */
complete refacotriing the inv and buf part in submodules
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BasicPort input_port("in", num_inputs);
develop and plug mux_lib_builder, refactoring the mux submodule generation
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module_manager.add_port(module_id, input_port, ModuleManager::MODULE_INPUT_PORT);
/* Add each output port */
complete refacotriing the inv and buf part in submodules
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BasicPort output_port("out", num_outputs);
develop and plug mux_lib_builder, refactoring the mux submodule generation
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module_manager.add_port(module_id, output_port, ModuleManager::MODULE_OUTPUT_PORT);
/* Add each memory port */
complete refacotriing the inv and buf part in submodules
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BasicPort mem_port("mem", num_mems);
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module_manager.add_port(module_id, mem_port, ModuleManager::MODULE_INPUT_PORT);
complete refacotriing the inv and buf part in submodules
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BasicPort mem_inv_port("mem_inv", num_mems);
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module_manager.add_port(module_id, mem_inv_port, ModuleManager::MODULE_INPUT_PORT);
rework on the circuit model ports and start prototyping mux Verilog generation
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develop and plug mux_lib_builder, refactoring the mux submodule generation
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/* dump module definition + ports */
print_verilog_module_declaration(fp, module_manager, module_id);
rework on the circuit model ports and start prototyping mux Verilog generation
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refactored behavioral mux branch verilog generation
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/* Print the internal logic in either structural or behavioral Verilog codes */
if (true == use_structural_verilog) {
generate_verilog_cmos_mux_branch_body_structural(module_manager, circuit_lib, fp, tgate_model, module_id, input_port, output_port, mem_port, mem_inv_port, mux_graph);
} else {
VTR_ASSERT_SAFE(false == use_structural_verilog);
/* Get the default value of SRAM ports */
std::vector<CircuitPortId> sram_ports = circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_SRAM, true);
std::vector<CircuitPortId> non_mode_select_sram_ports;
/* We should have only have 1 sram port except those are mode_bits */
for (const auto& port : sram_ports) {
if (true == circuit_lib.port_is_mode_select(port)) {
Merge branch 'refactoring' of https://github.com/LNIS-Projects/OpenFPGA into refactoring
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continue;
rework on the circuit model ports and start prototyping mux Verilog generation
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}
refactored behavioral mux branch verilog generation
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non_mode_select_sram_ports.push_back(port);
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}
refactored behavioral mux branch verilog generation
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VTR_ASSERT(1 == non_mode_select_sram_ports.size());
std::string mem_default_val = std::to_string(circuit_lib.port_default_value(non_mode_select_sram_ports[0]));
/* Mem string must be only 1-bit! */
VTR_ASSERT(1 == mem_default_val.length());
generate_verilog_cmos_mux_branch_body_behavioral(fp, input_port, output_port, mem_port, mux_graph, mem_default_val[0]);
rework on the circuit model ports and start prototyping mux Verilog generation
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}
try to reduce precision in timing assignment of Verilog netlist (travis iverilog was not happy)
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/* Put an end to the Verilog module */
print_verilog_module_end(fp, module_name);
developed subgraph extraction and start refactoring mux generation
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}
refactored rram mux generation
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/*********************************************************************
* Dump a structural verilog for RRAM MUX basis module
* This is only called when structural verilog dumping option is enabled for this spice model
* IMPORTANT: the structural verilog can NOT be used for functionality verification!!!
* TODO: This part is quite restricted to the way we implemented our RRAM FPGA
* Should be reworked to be more generic !!!
*
* By structural the schematic is splitted into two parts: left part and right part
* The left part includes BLB[0..N-1] and WL[0..N-1] signals as well as RRAMs
* The right part includes BLB[N] and WL[N]
* Corresponding Schematic is as follows:
*
* LEFT PART | RIGHT PART
*
* BLB[0] BLB[N]
* | |
* \|/ \|/
* in[0] ---->RRAM[0]-----+
* |
* BLB[1] |
* | |
* \|/ |
* in[1] ---->RRAM[1]-----+
* |-----> out[0]
* ...
* |
* in[N-1] ---->RRAM[N-1]---+
* /|\ /|\
* | |
* BLB[N-1] WL[N]
*
* Working principle:
* 1. Set a RRAM[i]: enable BLB[i] and WL[N]
* 2. Reset a RRAM[i]: enable BLB[N] and WL[i]
* 3. Operation: disable all BLBs and WLs
*
* The structure is done in the way we implement the physical layout of RRAM MUX
* It is NOT the only road to the goal!!!
*********************************************************************/
static
void generate_verilog_rram_mux_branch_body_structural(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const ModuleId& module_id,
const CircuitModelId& circuit_model,
const BasicPort& input_port,
const BasicPort& output_port,
const BasicPort& blb_port,
const BasicPort& wl_port,
const MuxGraph& mux_graph) {
std::string progTE_module_name("PROG_TE");
std::string progBE_module_name("PROG_BE");
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Verilog Behavior description for a MUX */
print_verilog_comment(fp, std::string("---- Structure-level description of RRAM MUX -----"));
/* Print internal structure of 4T1R programming structures
* Written in structural Verilog
* The whole structure-level description is divided into two parts:
* 1. Left part consists of N PROG_TE modules, each of which
* includes a PMOS, a NMOS and a RRAM, which is actually the left
* part of a 4T1R programming structure
* 2. Right part includes only a PROG_BE module, which consists
* of a PMOS and a NMOS, which is actually the right part of a
* 4T1R programming sturcture
*/
/* Create a module for the progTE and register it in the module manager
* Structure of progTE
*
* +----------+
* in--->| |
* BLB-->| progTE |--> out
* WL--->| |
* +----------+
*/
ModuleId progTE_module_id = module_manager.add_module(progTE_module_name);
/* If there is already such as module inside, we just ned to find the module id */
if (ModuleId::INVALID() == progTE_module_id) {
progTE_module_id = module_manager.find_module(progTE_module_name);
/* We should have a valid id! */
VTR_ASSERT(ModuleId::INVALID() != progTE_module_id);
}
/* Add ports to the module */
/* input port */
BasicPort progTE_in_port("A", 1);
module_manager.add_port(progTE_module_id, progTE_in_port, ModuleManager::MODULE_INPUT_PORT);
/* WL port */
BasicPort progTE_wl_port("WL", 1);
module_manager.add_port(progTE_module_id, progTE_wl_port, ModuleManager::MODULE_INPUT_PORT);
/* BLB port */
BasicPort progTE_blb_port("BLB", 1);
module_manager.add_port(progTE_module_id, progTE_blb_port, ModuleManager::MODULE_INPUT_PORT);
/* output port */
BasicPort progTE_out_port("Z", 1);
module_manager.add_port(progTE_module_id, progTE_out_port, ModuleManager::MODULE_INPUT_PORT);
/* LEFT part: Verilog code generation */
/* Iterate over the inputs */
for (const auto& mux_input : mux_graph.inputs()) {
BasicPort cur_input_port(input_port.get_name(), size_t(mux_graph.input_id(mux_input)), size_t(mux_graph.input_id(mux_input)));
/* Iterate over the outputs */
for (const auto& mux_output : mux_graph.outputs()) {
BasicPort cur_output_port(output_port.get_name(), size_t(mux_graph.output_id(mux_output)), size_t(mux_graph.output_id(mux_output)));
/* if there is a connection between the input and output, a tgate will be outputted */
std::vector<MuxEdgeId> edges = mux_graph.find_edges(mux_input, mux_output);
/* There should be only one edge or no edge*/
VTR_ASSERT((1 == edges.size()) || (0 == edges.size()));
/* No need to output tgates if there are no edges between two nodes */
if (0 == edges.size()) {
continue;
}
/* Create a port-to-port name map */
std::map<std::string, BasicPort> port2port_name_map;
/* input port */
port2port_name_map[progTE_in_port.get_name()] = cur_input_port;
/* output port */
port2port_name_map[progTE_out_port.get_name()] = cur_output_port;
/* Find the mem_id controlling the edge */
MuxMemId mux_mem = mux_graph.find_edge_mem(edges[0]);
BasicPort cur_blb_port(blb_port.get_name(), size_t(mux_mem), size_t(mux_mem));
BasicPort cur_wl_port(wl_port.get_name(), size_t(mux_mem), size_t(mux_mem));
/* RRAM configuration port: there should not be any inverted edge in RRAM MUX! */
VTR_ASSERT( false == mux_graph.is_edge_use_inv_mem(edges[0]) );
/* wire mem to mem of module, and wire mem_inv to mem_inv of module */
port2port_name_map[progTE_blb_port.get_name()] = cur_blb_port;
port2port_name_map[progTE_wl_port.get_name()] = cur_wl_port;
/* Output an instance of the module */
print_verilog_module_instance(fp, module_manager, module_id, progTE_module_id, port2port_name_map, circuit_lib.dump_explicit_port_map(circuit_model));
/* IMPORTANT: this update MUST be called after the instance outputting!!!!
* update the module manager with the relationship between the parent and child modules
*/
module_manager.add_child_module(module_id, progTE_module_id);
}
}
/* Create a module for the progBE and register it in the module manager
* Structure of progBE
*
* +----------+
* | |
* BLB-->| progBE |<-> out
* WL--->| |
* +----------+
*/
ModuleId progBE_module_id = module_manager.add_module(progBE_module_name);
/* If there is already such as module inside, we just ned to find the module id */
if (ModuleId::INVALID() == progBE_module_id) {
progBE_module_id = module_manager.find_module(progBE_module_name);
/* We should have a valid id! */
VTR_ASSERT(ModuleId::INVALID() != progBE_module_id);
}
/* Add ports to the module */
/* inout port */
BasicPort progBE_inout_port("INOUT", 1);
module_manager.add_port(progBE_module_id, progBE_inout_port, ModuleManager::MODULE_INOUT_PORT);
/* WL port */
BasicPort progBE_wl_port("WL", 1);
module_manager.add_port(progBE_module_id, progBE_wl_port, ModuleManager::MODULE_INPUT_PORT);
/* BLB port */
BasicPort progBE_blb_port("BLB", 1);
module_manager.add_port(progBE_module_id, progBE_blb_port, ModuleManager::MODULE_INPUT_PORT);
/* RIGHT part: Verilog code generation */
/* Iterate over the outputs */
for (const auto& mux_output : mux_graph.outputs()) {
BasicPort cur_output_port(output_port.get_name(), size_t(mux_graph.output_id(mux_output)), size_t(mux_graph.output_id(mux_output)));
/* Create a port-to-port name map */
std::map<std::string, BasicPort> port2port_name_map;
/* Wire the output port to the INOUT port */
port2port_name_map[progBE_inout_port.get_name()] = cur_output_port;
/* Find the mem_id controlling the edge */
BasicPort cur_blb_port(blb_port.get_name(), mux_graph.num_memory_bits(), mux_graph.num_memory_bits());
BasicPort cur_wl_port(wl_port.get_name(), mux_graph.num_memory_bits(), mux_graph.num_memory_bits());
port2port_name_map[progBE_blb_port.get_name()] = cur_blb_port;
port2port_name_map[progBE_wl_port.get_name()] = cur_wl_port;
/* Output an instance of the module */
print_verilog_module_instance(fp, module_manager, module_id, progBE_module_id, port2port_name_map, circuit_lib.dump_explicit_port_map(circuit_model));
/* IMPORTANT: this update MUST be called after the instance outputting!!!!
* update the module manager with the relationship between the parent and child modules
*/
module_manager.add_child_module(module_id, progBE_module_id);
}
}
/*********************************************************************
* Generate behavior-level Verilog codes modeling an branch circuit
* for a RRAM-based multiplexer with the given size
* Corresponding Schematic is as follows:
*
* BLB[0] BLB[N]
* | |
* \|/ \|/
* in[0] ---->RRAM[0]-----+
* |
* BLB[1] |
* | |
* \|/ |
* in[1] ---->RRAM[1]-----+
* |-----> out[0]
* ...
* |
* in[N-1] ---->RRAM[N-1]---+
* /|\ /|\
* | |
* BLB[N-1] WL[N]
*
* Working principle:
* 1. Set a RRAM[i]: enable BLB[i] and WL[N]
* 2. Reset a RRAM[i]: enable BLB[N] and WL[i]
* 3. Operation: disable all BLBs and WLs
*
* TODO: Elaborate the codes to output the circuit logic
* following the mux_graph!
*********************************************************************/
static
void generate_verilog_rram_mux_branch_body_behavioral(std::fstream& fp,
const CircuitLibrary& circuit_lib,
const CircuitModelId& circuit_model,
const BasicPort& input_port,
const BasicPort& output_port,
const BasicPort& blb_port,
const BasicPort& wl_port,
const MuxGraph& mux_graph) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Verilog Behavior description for a MUX */
print_verilog_comment(fp, std::string("---- Behavioral-level description of RRAM MUX -----"));
/* Add an internal register for the output */
BasicPort outreg_port("out_reg", mux_graph.num_inputs());
/* Print the port */
fp << "\t" << generate_verilog_port(VERILOG_PORT_REG, outreg_port) << ";" << std::endl;
/* Print the internal logics */
fp << "\t" << "always @(";
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fp << generate_verilog_port(VERILOG_PORT_CONKT, blb_port);
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fp << ", ";
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fp << generate_verilog_port(VERILOG_PORT_CONKT, wl_port);
fp << ")";
fp << " begin" << std::endl;
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/* Only when the last bit of wl is enabled,
* the propagating path can be changed
* (RRAM value can be changed) */
fp << "\t\t" << "if (";
BasicPort set_enable_port(wl_port.get_name(), wl_port.get_width() - 1, wl_port.get_width() - 1);
fp << generate_verilog_port(VERILOG_PORT_CONKT, set_enable_port);
/* We need two config-enable ports: prog_EN and prog_ENb */
bool find_prog_EN = false;
bool find_prog_ENb = false;
for (const auto& port : circuit_lib.model_global_ports(circuit_model, true)) {
/* Bypass non-config-enable ports */
if (false == circuit_lib.port_is_config_enable(port)) {
continue;
}
/* Reach here, the port should be is_config_enable */
/* Create a port object */
fp << " && ";
BasicPort prog_en_port(circuit_lib.port_prefix(port), circuit_lib.port_size(port));
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if ( 0 == circuit_lib.port_default_value(port)) {
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/* Default value = 0 means that this is a prog_EN port */
fp << generate_verilog_port(VERILOG_PORT_CONKT, prog_en_port);
find_prog_EN = true;
} else {
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VTR_ASSERT ( 1 == circuit_lib.port_default_value(port));
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/* Default value = 1 means that this is a prog_ENb port, add inversion in the if condition */
fp << "(~" << generate_verilog_port(VERILOG_PORT_CONKT, prog_en_port) << ")";
find_prog_ENb = true;
}
}
/* Check if we find any config_enable signals */
if (false == find_prog_EN) {
vpr_printf(TIO_MESSAGE_ERROR,
"(File:%s,[LINE%d])Unable to find a config_enable signal with default value 0 for a RRAM MUX (%s)!\n",
__FILE__, __LINE__, circuit_lib.model_name(circuit_model).c_str());
exit(1);
}
if (false == find_prog_ENb) {
vpr_printf(TIO_MESSAGE_ERROR,
"(File:%s,[LINE%d])Unable to find a config_enable signal with default value 1 for a RRAM MUX (%s)!\n",
__FILE__, __LINE__, circuit_lib.model_name(circuit_model).c_str());
exit(1);
}
/* Finish the if clause */
fp << ") begin" << std::endl;
for (const auto& mux_input : mux_graph.inputs()) {
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/* First if clause need tabs */
if ( 0 == size_t(mux_graph.input_id(mux_input)) ) {
fp << "\t\t\t";
}
fp << "if (1 == ";
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/* Create a temp port of a BLB bit */
BasicPort cur_blb_port(blb_port.get_name(), size_t(mux_graph.input_id(mux_input)), size_t(mux_graph.input_id(mux_input)));
fp << generate_verilog_port(VERILOG_PORT_CONKT, cur_blb_port);
fp << ") begin" << std::endl;
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fp << "\t\t\t\t" << "assign ";
fp << outreg_port.get_name();
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fp << " = " << size_t(mux_graph.input_id(mux_input)) << ";" << std::endl;
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fp << "\t\t\t" << "end else ";
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}
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fp << "begin" << std::endl;
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fp << "\t\t\t\t" << "assign ";
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fp << outreg_port.get_name();
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fp << " = 0;" << std::endl;
fp << "\t\t\t" << "end" << std::endl;
fp << "\t\t" << "end" << std::endl;
fp << "\t" << "end" << std::endl;
fp << "\t" << "assign ";
fp << generate_verilog_port(VERILOG_PORT_CONKT, output_port);
fp << " = ";
fp << input_port.get_name() << "[";
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fp << outreg_port.get_name();
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fp << "];" << std::endl;
}
/*********************************************************************
* Generate Verilog codes modeling an branch circuit
* for a RRAM-based multiplexer with the given size
* Support structural and behavioral Verilog codes
*********************************************************************/
static
void generate_verilog_rram_mux_branch_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const CircuitModelId& circuit_model,
const std::string& module_name,
const MuxGraph& mux_graph,
const bool& use_structural_verilog) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Generate the Verilog netlist according to the mux_graph */
/* Find out the number of inputs */
size_t num_inputs = mux_graph.num_inputs();
/* Find out the number of outputs */
size_t num_outputs = mux_graph.num_outputs();
/* Find out the number of memory bits */
size_t num_mems = mux_graph.num_memory_bits();
/* Check codes to ensure the port of Verilog netlists will match */
/* MUX graph must have only 1 output */
VTR_ASSERT(1 == num_outputs);
/* MUX graph must have only 1 level*/
VTR_ASSERT(1 == mux_graph.num_levels());
/* Create a Verilog Module based on the circuit model, and add to module manager */
ModuleId module_id = module_manager.add_module(module_name);
VTR_ASSERT(ModuleId::INVALID() != module_id);
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/* Add module ports */
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/* Add each global programming enable/disable ports */
std::vector<CircuitPortId> prog_enable_ports = circuit_lib.model_global_ports_by_type(circuit_model, SPICE_MODEL_PORT_INPUT, true);
for (const auto& port : prog_enable_ports) {
/* Configure each global port */
BasicPort global_port(circuit_lib.port_lib_name(port), circuit_lib.port_size(port));
module_manager.add_port(module_id, global_port, ModuleManager::MODULE_GLOBAL_PORT);
}
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/* Add each input port */
BasicPort input_port("in", num_inputs);
module_manager.add_port(module_id, input_port, ModuleManager::MODULE_INPUT_PORT);
/* Add each output port */
BasicPort output_port("out", num_outputs);
module_manager.add_port(module_id, output_port, ModuleManager::MODULE_OUTPUT_PORT);
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/* Add RRAM programming ports,
* RRAM MUXes require one more pair of BLB and WL
* to configure the memories. See schematic for details
*/
BasicPort blb_port("blb", num_mems + 1);
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module_manager.add_port(module_id, blb_port, ModuleManager::MODULE_INPUT_PORT);
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BasicPort wl_port("wl", num_mems + 1);
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module_manager.add_port(module_id, wl_port, ModuleManager::MODULE_INPUT_PORT);
/* dump module definition + ports */
print_verilog_module_declaration(fp, module_manager, module_id);
/* Print the internal logic in either structural or behavioral Verilog codes */
if (true == use_structural_verilog) {
generate_verilog_rram_mux_branch_body_structural(module_manager, circuit_lib, fp, module_id, circuit_model, input_port, output_port, blb_port, wl_port, mux_graph);
} else {
generate_verilog_rram_mux_branch_body_behavioral(fp, circuit_lib, circuit_model, input_port, output_port, blb_port, wl_port, mux_graph);
}
/* Put an end to the Verilog module */
print_verilog_module_end(fp, module_name);
}
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/***********************************************
* Generate Verilog codes modeling an branch circuit
* for a multiplexer with the given size
**********************************************/
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static
void generate_verilog_mux_branch_module(ModuleManager& module_manager,
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const CircuitLibrary& circuit_lib,
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std::fstream& fp,
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const CircuitModelId& circuit_model,
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const size_t& mux_size,
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const MuxGraph& mux_graph) {
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std::string module_name = generate_verilog_mux_branch_subckt_name(circuit_lib, circuit_model, mux_size, mux_graph.num_inputs(), verilog_mux_basis_posfix);
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/* Multiplexers built with different technology is in different organization */
switch (circuit_lib.design_tech_type(circuit_model)) {
case SPICE_MODEL_DESIGN_CMOS:
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generate_verilog_cmos_mux_branch_module(module_manager, circuit_lib, fp, circuit_model, module_name, mux_graph,
circuit_lib.dump_structural_verilog(circuit_model));
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break;
case SPICE_MODEL_DESIGN_RRAM:
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generate_verilog_rram_mux_branch_module(module_manager, circuit_lib, fp, circuit_model, module_name, mux_graph,
circuit_lib.dump_structural_verilog(circuit_model));
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break;
default:
vpr_printf(TIO_MESSAGE_ERROR,
"(FILE:%s,LINE[%d]) Invalid design technology of multiplexer (name: %s)\n",
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__FILE__, __LINE__, circuit_lib.model_name(circuit_model).c_str());
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exit(1);
}
}
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/********************************************************************
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* Generate the standard-cell-based internal logic (multiplexing structure)
* for a multiplexer or LUT in Verilog codes
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* This function will :
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* 1. build a multiplexing structure by instanciating standard cells MUX2
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* 2. add intermediate buffers between multiplexing stages if specified.
*******************************************************************/
static
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void generate_verilog_cmos_mux_module_mux2_multiplexing_structure(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const ModuleId& module_id,
const CircuitModelId& circuit_model,
const CircuitModelId& std_cell_model,
const MuxGraph& mux_graph) {
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/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* TODO: these are duplicated codes, find a way to simplify it!!!
* Get the regular (non-mode-select) sram ports from the mux
*/
std::vector<CircuitPortId> mux_regular_sram_ports;
for (const auto& port : circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_SRAM, true)) {
/* Multiplexing structure does not mode_sram_ports, they are handled in LUT modules
* Here we just bypass it.
*/
if (true == circuit_lib.port_is_mode_select(port)) {
continue;
}
mux_regular_sram_ports.push_back(port);
}
VTR_ASSERT(1 == mux_regular_sram_ports.size());
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/* Find the input ports and output ports of the standard cell */
std::vector<CircuitPortId> std_cell_input_ports = circuit_lib.model_ports_by_type(std_cell_model, SPICE_MODEL_PORT_INPUT, true);
std::vector<CircuitPortId> std_cell_output_ports = circuit_lib.model_ports_by_type(std_cell_model, SPICE_MODEL_PORT_OUTPUT, true);
/* Quick check the requirements on port map */
VTR_ASSERT(3 == std_cell_input_ports.size());
VTR_ASSERT(1 == std_cell_output_ports.size());
/* Build the location map of intermediate buffers */
std::vector<bool> inter_buffer_location_map = build_mux_intermediate_buffer_location_map(circuit_lib, circuit_model, mux_graph.num_node_levels());
print_verilog_comment(fp, std::string("---- BEGIN Internal Logic of a CMOS MUX module based on Standard Cells -----"));
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print_verilog_comment(fp, std::string("---- BEGIN Internal wires of a CMOS MUX module -----"));
/* Print local wires which are the nodes in the mux graph */
for (size_t level = 0; level < mux_graph.num_levels(); ++level) {
/* Print the internal wires located at this level */
BasicPort internal_wire_port(generate_verilog_mux_node_name(level, false), mux_graph.num_nodes_at_level(level));
fp << "\t" << generate_verilog_port(VERILOG_PORT_WIRE, internal_wire_port) << ";" << std::endl;
/* Identify if an intermediate buffer is needed */
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if (false == inter_buffer_location_map[level]) {
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continue;
}
BasicPort internal_wire_buffered_port(generate_verilog_mux_node_name(level, true), mux_graph.num_nodes_at_level(level));
fp << "\t" << generate_verilog_port(VERILOG_PORT_WIRE, internal_wire_buffered_port) << std::endl;
}
print_verilog_comment(fp, std::string("---- END Internal wires of a CMOS MUX module -----"));
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fp << std::endl;
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/* Iterate over all the internal nodes and output nodes in the mux graph */
for (const auto& node : mux_graph.non_input_nodes()) {
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print_verilog_comment(fp, std::string("---- BEGIN Instanciation of a branch CMOS MUX modules -----"));
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/* Get the size of branch circuit
* Instanciate an branch circuit by the size (fan-in) of the node
*/
size_t branch_size = mux_graph.node_in_edges(node).size();
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/* Get the nodes which drive the root_node */
std::vector<MuxNodeId> input_nodes;
for (const auto& edge : mux_graph.node_in_edges(node)) {
/* Get the nodes drive the edge */
for (const auto& src_node : mux_graph.edge_src_nodes(edge)) {
input_nodes.push_back(src_node);
}
}
/* Number of inputs should match the branch_input_size!!! */
VTR_ASSERT(input_nodes.size() == branch_size);
/* Get the node level and index in the current level */
size_t output_node_level = mux_graph.node_level(node);
size_t output_node_index_at_level = mux_graph.node_index_at_level(node);
/* Get the mems in the branch circuits */
std::vector<MuxMemId> mems;
for (const auto& edge : mux_graph.node_in_edges(node)) {
/* Get the mem control the edge */
MuxMemId mem = mux_graph.find_edge_mem(edge);
/* Add the mem if it is not in the list */
if (mems.end() == std::find(mems.begin(), mems.end(), mem)) {
mems.push_back(mem);
}
}
/* Instanciate the branch module, which is a standard cell MUX2
* We follow a fixed port map:
* TODO: the port map could be more flexible?
* input_port[0] of MUX2 standard cell is wired to input_node[0]
* input_port[1] of MUX2 standard cell is wired to input_node[1]
* output_port[0] of MUX2 standard cell is wired to output_node[0]
* input_port[2] of MUX2 standard cell is wired to mem_node[0]
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*/
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std::string branch_module_name= circuit_lib.model_name(std_cell_model);
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/* Get the moduleId for the submodule */
ModuleId branch_module_id = module_manager.find_module(branch_module_name);
/* We must have one */
VTR_ASSERT(ModuleId::INVALID() != branch_module_id);
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/* Create a port-to-port map */
std::map<std::string, BasicPort> port2port_name_map;
/* To match the standard cell MUX2: We should have only 2 input_nodes */
VTR_ASSERT(2 == input_nodes.size());
/* Build the link between input_node[0] and std_cell_input_port[0]
* Build the link between input_node[1] and std_cell_input_port[1]
*/
for (const auto& input_node : input_nodes) {
/* Generate the port info of each input node */
size_t input_node_level = mux_graph.node_level(input_node);
size_t input_node_index_at_level = mux_graph.node_index_at_level(input_node);
BasicPort instance_input_port(generate_verilog_mux_node_name(input_node_level, inter_buffer_location_map[input_node_level]), input_node_index_at_level, input_node_index_at_level);
/* Link nodes to input ports for the branch module */
std::string module_input_port_name = circuit_lib.port_lib_name(std_cell_input_ports[&input_node - &input_nodes[0]]);
port2port_name_map[module_input_port_name] = instance_input_port;
}
/* Build the link between output_node[0] and std_cell_output_port[0] */
{ /* Create a code block to accommodate the local variables */
BasicPort instance_output_port(generate_verilog_mux_node_name(output_node_level, false), output_node_index_at_level, output_node_index_at_level);
std::string module_output_port_name = circuit_lib.port_lib_name(std_cell_output_ports[0]);
port2port_name_map[module_output_port_name] = instance_output_port;
}
/* To match the standard cell MUX2: We should have only 1 mem_node */
VTR_ASSERT(1 == mems.size());
/* Build the link between mem_node[0] and std_cell_intput_port[2] */
for (const auto& mem : mems) {
/* Generate the port info of each mem node */
BasicPort instance_mem_port(circuit_lib.port_lib_name(mux_regular_sram_ports[0]), size_t(mem), size_t(mem));
std::string module_mem_port_name = circuit_lib.port_lib_name(std_cell_input_ports[2]);
port2port_name_map[module_mem_port_name] = instance_mem_port;
}
/* Output an instance of the module */
print_verilog_module_instance(fp, module_manager, module_id, branch_module_id, port2port_name_map, circuit_lib.dump_explicit_port_map(std_cell_model));
/* IMPORTANT: this update MUST be called after the instance outputting!!!!
* update the module manager with the relationship between the parent and child modules
*/
module_manager.add_child_module(module_id, branch_module_id);
print_verilog_comment(fp, std::string("---- END Instanciation of a branch CMOS MUX modules -----"));
if (false == inter_buffer_location_map[output_node_level]) {
continue; /* No need for intermediate buffers */
}
print_verilog_comment(fp, std::string("---- BEGIN Instanciation of a intermediate buffer modules -----"));
/* Now we need to add intermediate buffers by instanciating the modules */
CircuitModelId buffer_model = circuit_lib.lut_intermediate_buffer_model(circuit_model);
/* We must have a valid model id */
VTR_ASSERT(CircuitModelId::INVALID() != buffer_model);
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BasicPort buffer_instance_input_port(generate_verilog_mux_node_name(output_node_level, false), output_node_index_at_level, output_node_index_at_level);
BasicPort buffer_instance_output_port(generate_verilog_mux_node_name(output_node_level, true), output_node_index_at_level, output_node_index_at_level);
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print_verilog_buffer_instance(fp, module_manager, circuit_lib, module_id, buffer_model, buffer_instance_input_port, buffer_instance_output_port);
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print_verilog_comment(fp, std::string("---- END Instanciation of a intermediate buffer modules -----"));
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fp << std::endl;
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}
print_verilog_comment(fp, std::string("---- END Internal Logic of a CMOS MUX module based on Standard Cells -----"));
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fp << std::endl;
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}
/********************************************************************
* Generate the pass-transistor/transmission-gate -based internal logic
* (multiplexing structure) for a multiplexer or LUT in Verilog codes
* This function will :
* 1. build a multiplexing structure by instanciating the branch circuits
* generated before
* 2. add intermediate buffers between multiplexing stages if specified.
*******************************************************************/
static
void generate_verilog_cmos_mux_module_tgate_multiplexing_structure(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const ModuleId& module_id,
const CircuitModelId& circuit_model,
const MuxGraph& mux_graph) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Find the actual mux size */
size_t mux_size = find_mux_num_datapath_inputs(circuit_lib, circuit_model, mux_graph.num_inputs());
/* TODO: these are duplicated codes, find a way to simplify it!!!
* Get the regular (non-mode-select) sram ports from the mux
*/
std::vector<CircuitPortId> mux_regular_sram_ports;
for (const auto& port : circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_SRAM, true)) {
/* Multiplexing structure does not mode_sram_ports, they are handled in LUT modules
* Here we just bypass it.
*/
if (true == circuit_lib.port_is_mode_select(port)) {
continue;
}
mux_regular_sram_ports.push_back(port);
}
VTR_ASSERT(1 == mux_regular_sram_ports.size());
/* Build the location map of intermediate buffers */
std::vector<bool> inter_buffer_location_map = build_mux_intermediate_buffer_location_map(circuit_lib, circuit_model, mux_graph.num_node_levels());
print_verilog_comment(fp, std::string("---- BEGIN Internal Logic of a CMOS MUX module based on Pass-transistor/Transmission-gates -----"));
print_verilog_comment(fp, std::string("---- BEGIN Internal wires of a CMOS MUX module -----"));
/* Print local wires which are the nodes in the mux graph */
for (size_t level = 0; level < mux_graph.num_levels(); ++level) {
/* Print the internal wires located at this level */
BasicPort internal_wire_port(generate_verilog_mux_node_name(level, false), mux_graph.num_nodes_at_level(level));
fp << "\t" << generate_verilog_port(VERILOG_PORT_WIRE, internal_wire_port) << ";" << std::endl;
/* Identify if an intermediate buffer is needed */
if (false == inter_buffer_location_map[level]) {
continue;
}
BasicPort internal_wire_buffered_port(generate_verilog_mux_node_name(level, true), mux_graph.num_nodes_at_level(level));
fp << "\t" << generate_verilog_port(VERILOG_PORT_WIRE, internal_wire_buffered_port) << std::endl;
}
print_verilog_comment(fp, std::string("---- END Internal wires of a CMOS MUX module -----"));
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fp << std::endl;
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print_verilog_comment(fp, std::string("---- BEGIN Instanciation of a branch CMOS MUX module -----"));
/* Iterate over all the internal nodes and output nodes in the mux graph */
for (const auto& node : mux_graph.non_input_nodes()) {
print_verilog_comment(fp, std::string("---- BEGIN Instanciation of a branch CMOS MUX module -----"));
/* Get the size of branch circuit
* Instanciate an branch circuit by the size (fan-in) of the node
*/
size_t branch_size = mux_graph.node_in_edges(node).size();
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/* Get the node level and index in the current level */
size_t output_node_level = mux_graph.node_level(node);
size_t output_node_index_at_level = mux_graph.node_index_at_level(node);
/* Get the nodes which drive the root_node */
std::vector<MuxNodeId> input_nodes;
for (const auto& edge : mux_graph.node_in_edges(node)) {
/* Get the nodes drive the edge */
for (const auto& src_node : mux_graph.edge_src_nodes(edge)) {
input_nodes.push_back(src_node);
}
}
/* Number of inputs should match the branch_input_size!!! */
VTR_ASSERT(input_nodes.size() == branch_size);
/* Get the mems in the branch circuits */
std::vector<MuxMemId> mems;
for (const auto& edge : mux_graph.node_in_edges(node)) {
/* Get the mem control the edge */
MuxMemId mem = mux_graph.find_edge_mem(edge);
/* Add the mem if it is not in the list */
if (mems.end() == std::find(mems.begin(), mems.end(), mem)) {
mems.push_back(mem);
}
}
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/* Instanciate the branch module which is a tgate-based module
*/
std::string branch_module_name= generate_verilog_mux_branch_subckt_name(circuit_lib, circuit_model, mux_size, branch_size, verilog_mux_basis_posfix);
/* Get the moduleId for the submodule */
ModuleId branch_module_id = module_manager.find_module(branch_module_name);
/* We must have one */
VTR_ASSERT(ModuleId::INVALID() != branch_module_id);
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/* Create a port-to-port map */
std::map<std::string, BasicPort> port2port_name_map;
/* TODO: the branch module name should NOT be hard-coded. Use the port lib_name given by users! */
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/* All the input node names organized in bus */
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std::vector<BasicPort> branch_node_input_ports;
for (const auto& input_node : input_nodes) {
/* Generate the port info of each input node */
size_t input_node_level = mux_graph.node_level(input_node);
size_t input_node_index_at_level = mux_graph.node_index_at_level(input_node);
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BasicPort branch_node_input_port(generate_verilog_mux_node_name(input_node_level, inter_buffer_location_map[input_node_level]), input_node_index_at_level, input_node_index_at_level);
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branch_node_input_ports.push_back(branch_node_input_port);
}
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/* Create the port info for the input */
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/* TODO: the naming could be more flexible? */
BasicPort instance_input_port = generate_verilog_bus_port(branch_node_input_ports, std::string(generate_verilog_mux_node_name(output_node_level, false) + "_in"));
/* If we have more than 1 port in the combined instance ports ,
* output a local wire */
if (1 < combine_verilog_ports(branch_node_input_ports).size()) {
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/* Print a local wire for the merged ports */
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fp << "\t" << generate_verilog_local_wire(instance_input_port, branch_node_input_ports) << std::endl;
} else {
/* Safety check */
VTR_ASSERT(1 == combine_verilog_ports(branch_node_input_ports).size());
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}
/* Link nodes to input ports for the branch module */
ModulePortId module_input_port_id = module_manager.find_module_port(branch_module_id, "in");
VTR_ASSERT(ModulePortId::INVALID() != module_input_port_id);
/* Get the port from module */
BasicPort module_input_port = module_manager.module_port(branch_module_id, module_input_port_id);
port2port_name_map[module_input_port.get_name()] = instance_input_port;
/* Link nodes to output ports for the branch module */
BasicPort instance_output_port(generate_verilog_mux_node_name(output_node_level, false), output_node_index_at_level, output_node_index_at_level);
ModulePortId module_output_port_id = module_manager.find_module_port(branch_module_id, "out");
VTR_ASSERT(ModulePortId::INVALID() != module_output_port_id);
/* Get the port from module */
BasicPort module_output_port = module_manager.module_port(branch_module_id, module_output_port_id);
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port2port_name_map[module_output_port.get_name()] = instance_output_port;
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/* All the mem node names organized in bus */
std::vector<BasicPort> branch_node_mem_ports;
for (const auto& mem : mems) {
/* Generate the port info of each mem node */
BasicPort branch_node_mem_port(circuit_lib.port_lib_name(mux_regular_sram_ports[0]), size_t(mem), size_t(mem));
branch_node_mem_ports.push_back(branch_node_mem_port);
}
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/* Create the port info for the input */
/* TODO: the naming could be more flexible? */
BasicPort instance_mem_port = generate_verilog_bus_port(branch_node_mem_ports, std::string(generate_verilog_mux_node_name(output_node_level, false) + "_mem"));
/* If we have more than 1 port in the combined instance ports ,
* output a local wire */
if (1 < combine_verilog_ports(branch_node_mem_ports).size()) {
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/* Print a local wire for the merged ports */
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fp << "\t" << generate_verilog_local_wire(instance_mem_port, branch_node_mem_ports) << std::endl;
} else {
/* Safety check */
VTR_ASSERT(1 == combine_verilog_ports(branch_node_mem_ports).size());
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}
/* Link nodes to input ports for the branch module */
/* TODO: the naming could be more flexible? */
ModulePortId module_mem_port_id = module_manager.find_module_port(branch_module_id, "mem");
VTR_ASSERT(ModulePortId::INVALID() != module_mem_port_id);
/* Get the port from module */
BasicPort module_mem_port = module_manager.module_port(branch_module_id, module_mem_port_id);
port2port_name_map[module_mem_port.get_name()] = instance_mem_port;
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/* TODO: the postfix _inv can be soft coded in the circuit library as a port_inv_postfix */
/* Create the port info for the mem_inv */
std::vector<BasicPort> branch_node_mem_inv_ports;
for (const auto& mem : mems) {
/* Generate the port info of each mem node */
BasicPort branch_node_mem_inv_port(circuit_lib.port_lib_name(mux_regular_sram_ports[0]) + "_inv", size_t(mem), size_t(mem));
branch_node_mem_inv_ports.push_back(branch_node_mem_inv_port);
}
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/* Create the port info for the input */
/* TODO: the naming could be more flexible? */
BasicPort instance_mem_inv_port = generate_verilog_bus_port(branch_node_mem_inv_ports, std::string(generate_verilog_mux_node_name(output_node_level, false) + "_mem_inv"));
/* If we have more than 1 port in the combined instance ports ,
* output a local wire */
if (1 < combine_verilog_ports(branch_node_mem_inv_ports).size()) {
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/* Print a local wire for the merged ports */
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fp << "\t" << generate_verilog_local_wire(instance_mem_port, branch_node_mem_inv_ports) << std::endl;
} else {
/* Safety check */
VTR_ASSERT(1 == combine_verilog_ports(branch_node_mem_inv_ports).size());
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}
/* Link nodes to input ports for the branch module */
/* TODO: the naming could be more flexible? */
ModulePortId module_mem_inv_port_id = module_manager.find_module_port(branch_module_id, "mem_inv");
VTR_ASSERT(ModulePortId::INVALID() != module_mem_inv_port_id);
/* Get the port from module */
BasicPort module_mem_inv_port = module_manager.module_port(branch_module_id, module_mem_inv_port_id);
port2port_name_map[module_mem_inv_port.get_name()] = instance_mem_inv_port;
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/* Output an instance of the module */
print_verilog_module_instance(fp, module_manager, module_id, branch_module_id, port2port_name_map, circuit_lib.dump_explicit_port_map(circuit_model));
/* IMPORTANT: this update MUST be called after the instance outputting!!!!
* update the module manager with the relationship between the parent and child modules
*/
module_manager.add_child_module(module_id, branch_module_id);
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print_verilog_comment(fp, std::string("---- END Instanciation of a branch CMOS MUX module -----"));
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fp << std::endl;
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if (false == inter_buffer_location_map[output_node_level]) {
continue; /* No need for intermediate buffers */
}
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print_verilog_comment(fp, std::string("---- BEGIN Instanciation of an intermediate buffer modules -----"));
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/* Now we need to add intermediate buffers by instanciating the modules */
CircuitModelId buffer_model = circuit_lib.lut_intermediate_buffer_model(circuit_model);
/* We must have a valid model id */
VTR_ASSERT(CircuitModelId::INVALID() != buffer_model);
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BasicPort buffer_instance_input_port(generate_verilog_mux_node_name(output_node_level, false), output_node_index_at_level, output_node_index_at_level);
BasicPort buffer_instance_output_port(generate_verilog_mux_node_name(output_node_level, true), output_node_index_at_level, output_node_index_at_level);
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print_verilog_buffer_instance(fp, module_manager, circuit_lib, module_id, buffer_model, buffer_instance_input_port, buffer_instance_output_port);
print_verilog_comment(fp, std::string("---- END Instanciation of an intermediate buffer module -----"));
fp << std::endl;
}
print_verilog_comment(fp, std::string("---- END Internal Logic of a CMOS MUX module based on Pass-transistor/Transmission-gates -----"));
fp << std::endl;
}
/********************************************************************
* Generate the input bufferes for a multiplexer or LUT in Verilog codes
* 1. If input are required to be buffered (specified by users),
* buffers will be added to all the datapath inputs.
* 2. If input are required to NOT be buffered (specified by users),
* all the datapath inputs will be short wired to MUX inputs.
*
* For those Multiplexers or LUTs require a constant input:
* the last input of multiplexer will be wired to a constant voltage level
*******************************************************************/
static
void generate_verilog_cmos_mux_module_input_buffers(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const ModuleId& module_id,
const CircuitModelId& circuit_model,
const MuxGraph& mux_graph) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Get the input ports from the mux */
std::vector<CircuitPortId> mux_input_ports = circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_INPUT, true);
/* We should have only 1 input port! */
VTR_ASSERT(1 == mux_input_ports.size());
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/* Get the input port from MUX module */
ModulePortId module_input_port_id = module_manager.find_module_port(module_id, circuit_lib.port_lib_name(mux_input_ports[0]));
VTR_ASSERT(ModulePortId::INVALID() != module_input_port_id);
/* Get the port from module */
BasicPort module_input_port = module_manager.module_port(module_id, module_input_port_id);
/* Iterate over all the inputs in the MUX graph */
for (const auto& input_node : mux_graph.inputs()) {
/* Fetch fundamental information from MUX graph w.r.t. the input node */
MuxInputId input_index = mux_graph.input_id(input_node);
VTR_ASSERT(MuxInputId::INVALID() != input_index);
size_t input_node_level = mux_graph.node_level(input_node);
size_t input_node_index_at_level = mux_graph.node_index_at_level(input_node);
/* Create the port information of the MUX input, which is the input of buffer instance */
BasicPort instance_input_port(module_input_port.get_name(), size_t(input_index), size_t(input_index));
/* Create the port information of the MUX graph input, which is the output of buffer instance */
BasicPort instance_output_port(generate_verilog_mux_node_name(input_node_level, false), input_node_index_at_level, input_node_index_at_level);
/* For last input:
* Add a constant value to the last input, if this MUX needs a constant input
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*/
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if ( (MuxInputId(mux_graph.num_inputs() - 1) == mux_graph.input_id(input_node))
&& (true == circuit_lib.mux_add_const_input(circuit_model)) ) {
/* Get the constant input value */
size_t const_value = circuit_lib.mux_const_input_value(circuit_model);
VTR_ASSERT( (0 == const_value) || (1 == const_value) );
/* For the output of the buffer instance:
* Get the last inputs from the MUX graph and generate the node name in MUX module.
*/
print_verilog_comment(fp, std::string("---- BEGIN short-wire a multiplexing structure input to a constant value -----"));
print_verilog_wire_constant_values(fp, instance_output_port, std::vector<size_t>(1, const_value));
print_verilog_comment(fp, std::string("---- END short-wire a multiplexing structure input to a constant value -----"));
fp << std::endl;
continue; /* Finish here */
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}
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/* If the inputs are not supposed to be buffered */
if (false == circuit_lib.is_input_buffered(circuit_model)) {
print_verilog_comment(fp, std::string("---- BEGIN short-wire a multiplexing structure input to MUX module input -----"));
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/* Short wire all the datapath inputs to the MUX inputs */
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print_verilog_wire_connection(fp, instance_output_port, instance_input_port, false);
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print_verilog_comment(fp, std::string("---- END short-wire a multiplexing structure input to MUX module input -----"));
fp << std::endl;
continue; /* Finish here */
}
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/* Reach here, we need a buffer, create a port-to-port map and output the buffer instance */
print_verilog_comment(fp, std::string("---- BEGIN Instanciation of an input buffer module -----"));
/* Now we need to add intermediate buffers by instanciating the modules */
CircuitModelId buffer_model = circuit_lib.input_buffer_model(circuit_model);
/* We must have a valid model id */
VTR_ASSERT(CircuitModelId::INVALID() != buffer_model);
print_verilog_buffer_instance(fp, module_manager, circuit_lib, module_id, buffer_model, instance_input_port, instance_output_port);
print_verilog_comment(fp, std::string("---- END Instanciation of an input buffer module -----"));
fp << std::endl;
}
}
/********************************************************************
* Generate the output bufferes for a multiplexer or LUT in Verilog codes
* 1. If output are required to be buffered (specified by users),
* buffers will be added to all the outputs.
* 2. If output are required to NOT be buffered (specified by users),
* all the outputs will be short wired to MUX outputs.
*******************************************************************/
static
void generate_verilog_cmos_mux_module_output_buffers(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const ModuleId& module_id,
const CircuitModelId& circuit_model,
const MuxGraph& mux_graph) {
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Get the output ports from the mux */
std::vector<CircuitPortId> mux_output_ports = circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_OUTPUT, true);
/* Iterate over all the outputs in the MUX module */
for (const auto& output_port : mux_output_ports) {
/* Get the output port from MUX module */
ModulePortId module_output_port_id = module_manager.find_module_port(module_id, circuit_lib.port_lib_name(output_port));
VTR_ASSERT(ModulePortId::INVALID() != module_output_port_id);
/* Get the port from module */
BasicPort module_output_port = module_manager.module_port(module_id, module_output_port_id);
/* Iterate over each pin of the output port */
for (const auto& pin : circuit_lib.pins(output_port)) {
/* Fetch fundamental information from MUX graph w.r.t. the input node */
/* Deposite the last level of the graph, which is a default value */
size_t output_node_level = mux_graph.num_node_levels() - 1;
/* If there is a fracturable level specified for the output, we find the exact level */
if (size_t(-1) != circuit_lib.port_lut_frac_level(output_port)) {
output_node_level = circuit_lib.port_lut_frac_level(output_port);
}
/* Deposite a zero, which is a default value */
size_t output_node_index_at_level = 0;
/* If there are output masks, we find the node_index */
if (!circuit_lib.port_lut_output_masks(output_port).empty()) {
output_node_index_at_level = circuit_lib.port_lut_output_masks(output_port).at(pin);
}
/* Double check the node exists in the Mux Graph */
VTR_ASSERT(MuxNodeId::INVALID() != mux_graph.node_id(output_node_level, output_node_index_at_level));
/* Create the port information of the MUX input, which is the input of buffer instance */
BasicPort instance_input_port(generate_verilog_mux_node_name(output_node_level, false), output_node_index_at_level, output_node_index_at_level);
/* Create the port information of the module output at the given pin range, which is the output of buffer instance */
BasicPort instance_output_port(module_output_port.get_name(), pin, pin);
/* If the output is not supposed to be buffered */
if (false == circuit_lib.is_output_buffered(circuit_model)) {
print_verilog_comment(fp, std::string("---- BEGIN short-wire a multiplexing structure output to MUX module output -----"));
/* Short wire all the datapath inputs to the MUX inputs */
refactoring local encoders. Ready to plug in
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print_verilog_wire_connection(fp, instance_output_port, instance_input_port, false);
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print_verilog_comment(fp, std::string("---- END short-wire a multiplexing structure output to MUX module output -----"));
fp << std::endl;
continue; /* Finish here */
}
/* Reach here, we need a buffer, create a port-to-port map and output the buffer instance */
print_verilog_comment(fp, std::string("---- BEGIN Instanciation of an output buffer module -----"));
/* Now we need to add intermediate buffers by instanciating the modules */
CircuitModelId buffer_model = circuit_lib.output_buffer_model(circuit_model);
/* We must have a valid model id */
VTR_ASSERT(CircuitModelId::INVALID() != buffer_model);
print_verilog_buffer_instance(fp, module_manager, circuit_lib, module_id, buffer_model, instance_input_port, instance_output_port);
print_verilog_comment(fp, std::string("---- END Instanciation of an output buffer module -----"));
fp << std::endl;
}
}
implementing mux Verilog generation. Bugs detected, fixing ongoing
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}
start developing mux Verilog module generation
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/*********************************************************************
* Generate Verilog codes modeling a CMOS multiplexer with the given size
* The Verilog module will consist of three parts:
* 1. instances of the branch circuits of multiplexers which are generated before
* This builds up the multiplexing structure
* 2. Input buffers/inverters
* 3. Output buffers/inverters
*********************************************************************/
static
void generate_verilog_cmos_mux_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const CircuitModelId& circuit_model,
const std::string& module_name,
const MuxGraph& mux_graph) {
/* Get the global ports required by MUX (and any submodules) */
std::vector<CircuitPortId> mux_global_ports = circuit_lib.model_global_ports_by_type(circuit_model, SPICE_MODEL_PORT_INPUT, true);
/* Get the input ports from the mux */
std::vector<CircuitPortId> mux_input_ports = circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_INPUT, true);
/* Get the output ports from the mux */
std::vector<CircuitPortId> mux_output_ports = circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_OUTPUT, true);
/* Get the sram ports from the mux */
std::vector<CircuitPortId> mux_sram_ports = circuit_lib.model_ports_by_type(circuit_model, SPICE_MODEL_PORT_SRAM, true);
/* Make sure we have a valid file handler*/
check_file_handler(fp);
/* Generate the Verilog netlist according to the mux_graph */
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/* Find out the number of data-path inputs */
size_t num_inputs = find_mux_num_datapath_inputs(circuit_lib, circuit_model, mux_graph.num_inputs());
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/* Find out the number of outputs */
size_t num_outputs = mux_graph.num_outputs();
/* Find out the number of memory bits */
size_t num_mems = mux_graph.num_memory_bits();
/* Check codes to ensure the port of Verilog netlists will match */
/* MUX graph must have only 1 output */
VTR_ASSERT(1 == mux_input_ports.size());
/* A quick check on the model ports */
if ((SPICE_MODEL_MUX == circuit_lib.model_type(circuit_model))
|| ((SPICE_MODEL_LUT == circuit_lib.model_type(circuit_model))
&& (false == circuit_lib.is_lut_fracturable(circuit_model))) ) {
VTR_ASSERT(1 == mux_output_ports.size());
VTR_ASSERT(1 == circuit_lib.port_size(mux_output_ports[0]));
} else {
VTR_ASSERT_SAFE( (SPICE_MODEL_LUT == circuit_lib.model_type(circuit_model))
&& (true == circuit_lib.is_lut_fracturable(circuit_model)) );
for (const auto& port : mux_output_ports) {
VTR_ASSERT(0 < circuit_lib.port_size(port));
}
}
/* Create a Verilog Module based on the circuit model, and add to module manager */
ModuleId module_id = module_manager.add_module(module_name);
VTR_ASSERT(ModuleId::INVALID() != module_id);
/* Add module ports */
/* Add each global port */
for (const auto& port : mux_global_ports) {
/* Configure each global port */
BasicPort global_port(circuit_lib.port_lib_name(port), circuit_lib.port_size(port));
module_manager.add_port(module_id, global_port, ModuleManager::MODULE_GLOBAL_PORT);
}
/* Add each input port
* Treat MUX and LUT differently
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* 1. MUXes: we do not have a specific input/output sizes, it is inferred by architecture
* 2. LUTes: we do have specific input/output sizes,
* but the inputs of MUXes are the SRAM ports of LUTs
* and the SRAM ports of MUXes are the inputs of LUTs
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*/
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size_t input_port_cnt = 0;
start developing mux Verilog module generation
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for (const auto& port : mux_input_ports) {
BasicPort input_port(circuit_lib.port_lib_name(port), num_inputs);
module_manager.add_port(module_id, input_port, ModuleManager::MODULE_INPUT_PORT);
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/* Update counter */
input_port_cnt++;
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}
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/* Double check: We should have only 1 input port generated here! */
VTR_ASSERT(1 == input_port_cnt);
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for (const auto& port : mux_output_ports) {
BasicPort output_port(circuit_lib.port_lib_name(port), num_outputs);
if (SPICE_MODEL_LUT == circuit_lib.model_type(circuit_model)) {
output_port.set_width(circuit_lib.port_size(port));
}
module_manager.add_port(module_id, output_port, ModuleManager::MODULE_OUTPUT_PORT);
}
bug fixing for datapath mux size in Verilog generation
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start developing mux Verilog module generation
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size_t sram_port_cnt = 0;
for (const auto& port : mux_sram_ports) {
/* Multiplexing structure does not mode_sram_ports, they are handled in LUT modules
* Here we just bypass it.
*/
if (true == circuit_lib.port_is_mode_select(port)) {
continue;
}
BasicPort mem_port(circuit_lib.port_lib_name(port), num_mems);
module_manager.add_port(module_id, mem_port, ModuleManager::MODULE_INPUT_PORT);
BasicPort mem_inv_port(std::string(circuit_lib.port_lib_name(port) + "_inv"), num_mems);
module_manager.add_port(module_id, mem_inv_port, ModuleManager::MODULE_INPUT_PORT);
/* Update counter */
sram_port_cnt++;
}
bug fixing for datapath mux size in Verilog generation
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start developing mux Verilog module generation
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/* dump module definition + ports */
print_verilog_module_declaration(fp, module_manager, module_id);
/* TODO: Print the internal logic in Verilog codes */
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/* Print the Multiplexing structure in Verilog codes
* Separated generation strategy on using standard cell MUX2 or TGATE,
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* 1. MUX2 has a fixed port map: input_port[0] and input_port[1] is the data_path input
* 2. Branch TGATE-based module has a fixed port name
* TODO: the naming could be more flexible?
*/
/* Get the tgate model */
CircuitModelId tgate_model = circuit_lib.pass_gate_logic_model(circuit_model);
/* Instanciate the branch module:
* Case 1: the branch module is a standard cell MUX2
* Case 2: the branch module is a tgate-based module
*/
std::string branch_module_name;
if (SPICE_MODEL_GATE == circuit_lib.model_type(tgate_model)) {
VTR_ASSERT(SPICE_MODEL_GATE_MUX2 == circuit_lib.gate_type(tgate_model));
generate_verilog_cmos_mux_module_mux2_multiplexing_structure(module_manager, circuit_lib, fp, module_id, circuit_model, tgate_model, mux_graph);
} else {
VTR_ASSERT(SPICE_MODEL_PASSGATE == circuit_lib.model_type(tgate_model));
generate_verilog_cmos_mux_module_tgate_multiplexing_structure(module_manager, circuit_lib, fp, module_id, circuit_model, mux_graph);
}
refactored CMOS MUX buffering
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/* Print the input and output buffers in Verilog codes */
generate_verilog_cmos_mux_module_input_buffers(module_manager, circuit_lib, fp, module_id, circuit_model, mux_graph);
generate_verilog_cmos_mux_module_output_buffers(module_manager, circuit_lib, fp, module_id, circuit_model, mux_graph);
start developing mux Verilog module generation
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/* Put an end to the Verilog module */
print_verilog_module_end(fp, module_name);
}
/***********************************************
* Generate Verilog codes modeling a multiplexer
* with the given graph-level description
**********************************************/
static
void generate_verilog_mux_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
std::fstream& fp,
const CircuitModelId& circuit_model,
const MuxGraph& mux_graph) {
bug fixing for datapath mux size in Verilog generation
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std::string module_name = generate_verilog_mux_subckt_name(circuit_lib, circuit_model,
find_mux_num_datapath_inputs(circuit_lib, circuit_model, mux_graph.num_inputs()),
std::string(""));
start developing mux Verilog module generation
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/* Multiplexers built with different technology is in different organization */
switch (circuit_lib.design_tech_type(circuit_model)) {
case SPICE_MODEL_DESIGN_CMOS:
/* SRAM-based Multiplexer Verilog module generation */
generate_verilog_cmos_mux_module(module_manager, circuit_lib, fp, circuit_model, module_name, mux_graph);
break;
case SPICE_MODEL_DESIGN_RRAM:
/* TODO: RRAM-based Multiplexer Verilog module generation */
/*
generate_verilog_rram_mux_branch_module(module_manager, circuit_lib, fp, circuit_model, module_name, mux_graph,
circuit_lib.dump_structural_verilog(circuit_model));
*/
break;
default:
vpr_printf(TIO_MESSAGE_ERROR,
"(FILE:%s,LINE[%d]) Invalid design technology of multiplexer (name: %s)\n",
__FILE__, __LINE__, circuit_lib.model_name(circuit_model).c_str());
exit(1);
}
}
develop and plug mux_lib_builder, refactoring the mux submodule generation
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/***********************************************
* Generate Verilog modules for all the unique
* multiplexers in the FPGA device
**********************************************/
void print_verilog_submodule_muxes(ModuleManager& module_manager,
const MuxLibrary& mux_lib,
const CircuitLibrary& circuit_lib,
t_sram_orgz_info* cur_sram_orgz_info,
char* verilog_dir,
char* submodule_dir) {
/* TODO: Generate modules into a .bak file now. Rename after it is verified */
std::string verilog_fname(my_strcat(submodule_dir, muxes_verilog_file_name));
verilog_fname += ".bak";
/* Create the file stream */
std::fstream fp;
fp.open(verilog_fname, std::fstream::out | std::fstream::trunc);
check_file_handler(fp);
/* Print out debugging information for if the file is not opened/created properly */
vpr_printf(TIO_MESSAGE_INFO,
"Creating Verilog netlist for Multiplexers (%s) ...\n",
verilog_fname.c_str());
print_verilog_file_header(fp, "Multiplexers");
print_verilog_include_defines_preproc_file(fp, verilog_dir);
/* Generate basis sub-circuit for unique branches shared by the multiplexers */
for (auto mux : mux_lib.muxes()) {
const MuxGraph& mux_graph = mux_lib.mux_graph(mux);
CircuitModelId mux_circuit_model = mux_lib.mux_circuit_model(mux);
/* Create a mux graph for the branch circuit */
std::vector<MuxGraph> branch_mux_graphs = mux_graph.build_mux_branch_graphs();
/* Create branch circuits, which are N:1 one-level or 2:1 tree-like MUXes */
for (auto branch_mux_graph : branch_mux_graphs) {
generate_verilog_mux_branch_module(module_manager, circuit_lib, fp, mux_circuit_model,
bug fixing for datapath mux size in Verilog generation
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find_mux_num_datapath_inputs(circuit_lib, mux_circuit_model, mux_graph.num_inputs()),
branch_mux_graph);
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}
}
start developing mux Verilog module generation
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/* Generate unique Verilog modules for the multiplexers */
for (auto mux : mux_lib.muxes()) {
const MuxGraph& mux_graph = mux_lib.mux_graph(mux);
CircuitModelId mux_circuit_model = mux_lib.mux_circuit_model(mux);
/* Create MUX circuits */
generate_verilog_mux_module(module_manager, circuit_lib, fp, mux_circuit_model, mux_graph);
}
develop and plug mux_lib_builder, refactoring the mux submodule generation
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/* Close the file steam */
fp.close();
/* TODO:
* Scan-chain configuration circuit does not need any BLs/WLs!
* SRAM MUX does not need any reserved BL/WLs!
*/
/* Determine reserved Bit/Word Lines if a memory bank is specified,
* At least 1 BL/WL should be reserved!
*/
try_update_sram_orgz_info_reserved_blwl(cur_sram_orgz_info,
mux_lib.max_mux_size(), mux_lib.max_mux_size());
/* TODO: Add fname to the linked list when debugging is finished */
/*
submodule_verilog_subckt_file_path_head = add_one_subckt_file_name_to_llist(submodule_verilog_subckt_file_path_head, verilog_name);
*/
}