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add memory module builder

This commit is contained in:
tangxifan 2020-02-12 20:06:38 -07:00
parent 8e381f0581
commit 002c2795fe
3 changed files with 744 additions and 3 deletions
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7
openfpga/src/fabric/build_device_module.cpp
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@ -13,7 +13,7 @@
#include "build_mux_modules.h"
#include "build_lut_modules.h"
#include "build_wire_modules.h"
//#include "build_memory_modules.h"
#include "build_memory_modules.h"
//#include "build_grid_modules.h"
//#include "build_routing_modules.h"
//#include "build_top_module.h"
@ -62,8 +62,9 @@ ModuleManager build_device_module_graph(const DeviceContext& vpr_device_ctx,
build_wire_modules(module_manager, openfpga_ctx.arch().circuit_lib);
/* Build memory modules */
//build_memory_modules(module_manager, mux_lib, arch.spice->circuit_lib,
// arch.sram_inf.verilog_sram_inf_orgz->type);
build_memory_modules(module_manager, openfpga_ctx.mux_lib(),
openfpga_ctx.arch().circuit_lib,
openfpga_ctx.arch().config_protocol.type());
/* Build grid and programmable block modules */
//build_grid_modules(module_manager, arch.spice->circuit_lib, mux_lib,

715
openfpga/src/fabric/build_memory_modules.cpp Normal file
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@ -0,0 +1,715 @@
/*********************************************************************
* This file includes functions to generate Verilog submodules for
* the memories that are affiliated to multiplexers and other programmable
* circuit models, such as IOPADs, LUTs, etc.
********************************************************************/
#include <ctime>
#include <string>
#include <algorithm>
/* Headers from vtrutil library */
#include "vtr_log.h"
#include "vtr_time.h"
#include "vtr_assert.h"
#include "mux_graph.h"
#include "module_manager.h"
#include "circuit_library_utils.h"
#include "module_manager_utils.h"
#include "mux_utils.h"
#include "openfpga_reserved_words.h"
#include "openfpga_naming.h"
#include "build_memory_modules.h"
/* begin namespace openfpga */
namespace openfpga {
/*********************************************************************
* Add module nets to connect an input port of a memory module to
* an input port of its child module
* Restriction: this function is really designed for memory modules
* 1. It assumes that input port name of child module is the same as memory module
* 2. It assumes exact pin-to-pin mapping:
* j-th pin of input port of the i-th child module is wired to the j + i*W -th
* pin of input port of the memory module, where W is the size of port
********************************************************************/
static
void add_module_input_nets_to_mem_modules(ModuleManager& module_manager,
const ModuleId& mem_module,
const CircuitLibrary& circuit_lib,
const std::vector<CircuitPortId>& circuit_ports,
const ModuleId& child_module,
const size_t& child_index,
const size_t& child_instance) {
/* Wire inputs of parent module to inputs of child modules */
for (const auto& port : circuit_ports) {
ModulePortId src_port_id = module_manager.find_module_port(mem_module, circuit_lib.port_prefix(port));
ModulePortId sink_port_id = module_manager.find_module_port(child_module, circuit_lib.port_prefix(port));
for (size_t pin_id = 0; pin_id < module_manager.module_port(mem_module, sink_port_id).pins().size(); ++pin_id) {
ModuleNetId net = module_manager.create_module_net(mem_module);
/* Source pin is shifted by the number of memories */
size_t src_pin_id = child_index * circuit_lib.port_size(port) + module_manager.module_port(mem_module, src_port_id).pins()[pin_id];
/* Source node of the input net is the input of memory module */
module_manager.add_module_net_source(mem_module, net, mem_module, 0, src_port_id, src_pin_id);
/* Sink node of the input net is the input of sram module */
size_t sink_pin_id = module_manager.module_port(child_module, sink_port_id).pins()[pin_id];
module_manager.add_module_net_sink(mem_module, net, child_module, child_instance, sink_port_id, sink_pin_id);
}
}
}
/*********************************************************************
* Add module nets to connect an output port of a memory module to
* an output port of its child module
* Restriction: this function is really designed for memory modules
* 1. It assumes that output port name of child module is the same as memory module
* 2. It assumes exact pin-to-pin mapping:
* j-th pin of output port of the i-th child module is wired to the j + i*W -th
* pin of output port of the memory module, where W is the size of port
********************************************************************/
static
void add_module_output_nets_to_mem_modules(ModuleManager& module_manager,
const ModuleId& mem_module,
const CircuitLibrary& circuit_lib,
const std::vector<CircuitPortId>& circuit_ports,
const ModuleId& child_module,
const size_t& child_index,
const size_t& child_instance) {
/* Wire inputs of parent module to inputs of child modules */
for (const auto& port : circuit_ports) {
ModulePortId src_port_id = module_manager.find_module_port(child_module, circuit_lib.port_prefix(port));
ModulePortId sink_port_id = module_manager.find_module_port(mem_module, circuit_lib.port_prefix(port));
for (size_t pin_id = 0; pin_id < module_manager.module_port(child_module, src_port_id).pins().size(); ++pin_id) {
ModuleNetId net = module_manager.create_module_net(mem_module);
/* Source pin is shifted by the number of memories */
size_t src_pin_id = module_manager.module_port(child_module, src_port_id).pins()[pin_id];
/* Source node of the input net is the input of memory module */
module_manager.add_module_net_source(mem_module, net, child_module, child_instance, src_port_id, src_pin_id);
/* Sink node of the input net is the input of sram module */
size_t sink_pin_id = child_index * circuit_lib.port_size(port) + module_manager.module_port(mem_module, sink_port_id).pins()[pin_id];
module_manager.add_module_net_sink(mem_module, net, mem_module, 0, sink_port_id, sink_pin_id);
}
}
}
/*********************************************************************
* Add module nets to connect an output port of a configuration-chain
* memory module to an output port of its child module
* Restriction: this function is really designed for memory modules
* 1. It assumes that output port name of child module is the same as memory module
* 2. It assumes exact pin-to-pin mapping:
* j-th pin of output port of the i-th child module is wired to the j + i*W -th
* pin of output port of the memory module, where W is the size of port
* 3. It assumes fixed port name for output ports
*
* We cache the module nets that have been created because they will be used later
********************************************************************/
static
std::vector<ModuleNetId> add_module_output_nets_to_chain_mem_modules(ModuleManager& module_manager,
const ModuleId& mem_module,
const std::string& mem_module_output_name,
const CircuitLibrary& circuit_lib,
const CircuitPortId& circuit_port,
const ModuleId& child_module,
const size_t& child_index,
const size_t& child_instance) {
std::vector<ModuleNetId> module_nets;
/* Wire inputs of parent module to inputs of child modules */
ModulePortId src_port_id = module_manager.find_module_port(child_module, circuit_lib.port_prefix(circuit_port));
ModulePortId sink_port_id = module_manager.find_module_port(mem_module, mem_module_output_name);
for (size_t pin_id = 0; pin_id < module_manager.module_port(child_module, src_port_id).pins().size(); ++pin_id) {
ModuleNetId net = module_manager.create_module_net(mem_module);
/* Source pin is shifted by the number of memories */
size_t src_pin_id = module_manager.module_port(child_module, src_port_id).pins()[pin_id];
/* Source node of the input net is the input of memory module */
module_manager.add_module_net_source(mem_module, net, child_module, child_instance, src_port_id, src_pin_id);
/* Sink node of the input net is the input of sram module */
size_t sink_pin_id = child_index * circuit_lib.port_size(circuit_port) + module_manager.module_port(mem_module, sink_port_id).pins()[pin_id];
module_manager.add_module_net_sink(mem_module, net, mem_module, 0, sink_port_id, sink_pin_id);
/* Cache the nets */
module_nets.push_back(net);
}
return module_nets;
}
/********************************************************************
* Connect all the memory modules under the parent module in a chain
*
* +--------+ +--------+ +--------+
* ccff_head --->| Memory |--->| Memory |--->... --->| Memory |----> ccff_tail
* | Module | | Module | | Module |
* | [0] | | [1] | | [N-1] |
* +--------+ +--------+ +--------+
* For the 1st memory module:
* net source is the configuration chain head of the primitive module
* net sink is the configuration chain head of the next memory module
*
* For the rest of memory modules:
* net source is the configuration chain tail of the previous memory module
* net sink is the configuration chain head of the next memory module
*
* Note that:
* This function is designed for memory modules ONLY!
* Do not use it to replace the
* add_module_nets_cmos_memory_chain_config_bus() !!!
*********************************************************************/
static
void add_module_nets_to_cmos_memory_chain_module(ModuleManager& module_manager,
const ModuleId& parent_module,
const std::vector<ModuleNetId>& output_nets,
const CircuitLibrary& circuit_lib,
const CircuitPortId& model_input_port,
const CircuitPortId& model_output_port) {
/* Counter for the nets */
size_t net_counter = 0;
for (size_t mem_index = 0; mem_index < module_manager.configurable_children(parent_module).size(); ++mem_index) {
ModuleId net_src_module_id;
size_t net_src_instance_id;
ModulePortId net_src_port_id;
ModuleId net_sink_module_id;
size_t net_sink_instance_id;
ModulePortId net_sink_port_id;
if (0 == mem_index) {
/* Find the port name of configuration chain head */
std::string src_port_name = generate_configuration_chain_head_name();
net_src_module_id = parent_module;
net_src_instance_id = 0;
net_src_port_id = module_manager.find_module_port(net_src_module_id, src_port_name);
/* Find the port name of next memory module */
std::string sink_port_name = circuit_lib.port_prefix(model_input_port);
net_sink_module_id = module_manager.configurable_children(parent_module)[mem_index];
net_sink_instance_id = module_manager.configurable_child_instances(parent_module)[mem_index];
net_sink_port_id = module_manager.find_module_port(net_sink_module_id, sink_port_name);
} else {
/* Find the port name of previous memory module */
std::string src_port_name = circuit_lib.port_prefix(model_output_port);
net_src_module_id = module_manager.configurable_children(parent_module)[mem_index - 1];
net_src_instance_id = module_manager.configurable_child_instances(parent_module)[mem_index - 1];
net_src_port_id = module_manager.find_module_port(net_src_module_id, src_port_name);
/* Find the port name of next memory module */
std::string sink_port_name = circuit_lib.port_prefix(model_input_port);
net_sink_module_id = module_manager.configurable_children(parent_module)[mem_index];
net_sink_instance_id = module_manager.configurable_child_instances(parent_module)[mem_index];
net_sink_port_id = module_manager.find_module_port(net_sink_module_id, sink_port_name);
}
/* Get the pin id for source port */
BasicPort net_src_port = module_manager.module_port(net_src_module_id, net_src_port_id);
/* Get the pin id for sink port */
BasicPort net_sink_port = module_manager.module_port(net_sink_module_id, net_sink_port_id);
/* Port sizes of source and sink should match */
VTR_ASSERT(net_src_port.get_width() == net_sink_port.get_width());
/* Create a net for each pin */
for (size_t pin_id = 0; pin_id < net_src_port.pins().size(); ++pin_id) {
/* Create a net and add source and sink to it */
ModuleNetId net;
if (0 == mem_index) {
net = module_manager.create_module_net(parent_module);
} else {
net = output_nets[net_counter];
}
/* Add net source */
module_manager.add_module_net_source(parent_module, net, net_src_module_id, net_src_instance_id, net_src_port_id, net_src_port.pins()[pin_id]);
/* Add net sink */
module_manager.add_module_net_sink(parent_module, net, net_sink_module_id, net_sink_instance_id, net_sink_port_id, net_sink_port.pins()[pin_id]);
/* Update net counter */
if (0 < mem_index) {
net_counter++;
}
}
}
/* For the last memory module:
* net source is the configuration chain tail of the previous memory module
* net sink is the configuration chain tail of the primitive module
*/
/* Find the port name of previous memory module */
std::string src_port_name = circuit_lib.port_prefix(model_output_port);
ModuleId net_src_module_id = module_manager.configurable_children(parent_module).back();
size_t net_src_instance_id = module_manager.configurable_child_instances(parent_module).back();
ModulePortId net_src_port_id = module_manager.find_module_port(net_src_module_id, src_port_name);
/* Find the port name of next memory module */
std::string sink_port_name = generate_configuration_chain_tail_name();
ModuleId net_sink_module_id = parent_module;
size_t net_sink_instance_id = 0;
ModulePortId net_sink_port_id = module_manager.find_module_port(net_sink_module_id, sink_port_name);
/* Get the pin id for source port */
BasicPort net_src_port = module_manager.module_port(net_src_module_id, net_src_port_id);
/* Get the pin id for sink port */
BasicPort net_sink_port = module_manager.module_port(net_sink_module_id, net_sink_port_id);
/* Port sizes of source and sink should match */
VTR_ASSERT(net_src_port.get_width() == net_sink_port.get_width());
/* Create a net for each pin */
for (size_t pin_id = 0; pin_id < net_src_port.pins().size(); ++pin_id) {
/* Create a net and add source and sink to it */
ModuleNetId net = output_nets[net_counter];
/* Add net source */
module_manager.add_module_net_source(parent_module, net, net_src_module_id, net_src_instance_id, net_src_port_id, net_src_port.pins()[pin_id]);
/* Add net sink */
module_manager.add_module_net_sink(parent_module, net, net_sink_module_id, net_sink_instance_id, net_sink_port_id, net_sink_port.pins()[pin_id]);
/* Update net counter */
net_counter++;
}
VTR_ASSERT(net_counter == output_nets.size());
}
/*********************************************************************
* Flat memory modules
*
* in[0] in[1] in[N]
* | | |
* v v v
* +-------+ +-------+ +-------+
* | SRAM | | SRAM | ... | SRAM |
* | [0] | | [1] | | [N-1] |
* +-------+ +-------+ +-------+
* | | ... |
* v v v
* +------------------------------------+
* | Multiplexer Configuration port |
*
********************************************************************/
static
void build_memory_standalone_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
const std::string& module_name,
const CircuitModelId& sram_model,
const size_t& num_mems) {
/* Get the global ports required by the SRAM */
std::vector<enum e_circuit_model_port_type> global_port_types;
global_port_types.push_back(CIRCUIT_MODEL_PORT_CLOCK);
global_port_types.push_back(CIRCUIT_MODEL_PORT_INPUT);
std::vector<CircuitPortId> sram_global_ports = circuit_lib.model_global_ports_by_type(sram_model, global_port_types, true, false);
/* Get the input ports from the SRAM */
std::vector<CircuitPortId> sram_input_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_INPUT, true);
/* Get the output ports from the SRAM */
std::vector<CircuitPortId> sram_output_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_OUTPUT, true);
/* Create a module and add to the module manager */
ModuleId mem_module = module_manager.add_module(module_name);
VTR_ASSERT(true == module_manager.valid_module_id(mem_module));
/* Add each input port */
for (const auto& port : sram_input_ports) {
BasicPort input_port(circuit_lib.port_prefix(port), num_mems);
module_manager.add_port(mem_module, input_port, ModuleManager::MODULE_INPUT_PORT);
}
/* Add each output port: port width should match the number of memories */
for (const auto& port : sram_output_ports) {
BasicPort output_port(circuit_lib.port_prefix(port), num_mems);
module_manager.add_port(mem_module, output_port, ModuleManager::MODULE_OUTPUT_PORT);
}
/* Find the sram module in the module manager */
ModuleId sram_mem_module = module_manager.find_module(circuit_lib.model_name(sram_model));
/* Instanciate each submodule */
for (size_t i = 0; i < num_mems; ++i) {
size_t sram_mem_instance = module_manager.num_instance(mem_module, sram_mem_module);
module_manager.add_child_module(mem_module, sram_mem_module);
module_manager.add_configurable_child(mem_module, sram_mem_module, sram_mem_instance);
/* Build module nets */
/* Wire inputs of parent module to inputs of child modules */
add_module_input_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_input_ports, sram_mem_module, i, sram_mem_instance);
/* Wire inputs of parent module to outputs of child modules */
add_module_output_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_output_ports, sram_mem_module, i, sram_mem_instance);
}
/* Add global ports to the pb_module:
* This is a much easier job after adding sub modules (instances),
* we just need to find all the global ports from the child modules and build a list of it
*/
add_module_global_ports_from_child_modules(module_manager, mem_module);
}
/*********************************************************************
* Scan-chain organization
*
* +-------+ +-------+ +-------+
* scan-chain--->| CCFF |--->| CCFF |--->... --->| CCFF |---->scan-chain
* input&clock | [0] | | [1] | | [N-1] | output
* +-------+ +-------+ +-------+
* | | ... |
* v v v
* +-----------------------------------------+
* | Multiplexer Configuration port |
*
********************************************************************/
static
void build_memory_chain_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
const std::string& module_name,
const CircuitModelId& sram_model,
const size_t& num_mems) {
/* Get the input ports from the SRAM */
std::vector<CircuitPortId> sram_input_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_INPUT, true);
/* Should have only 1 input port */
VTR_ASSERT( 1 == sram_input_ports.size() );
/* Get the output ports from the SRAM */
std::vector<CircuitPortId> sram_output_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_OUTPUT, true);
/* Should have only 1 or 2 output port */
VTR_ASSERT( (1 == sram_output_ports.size()) || ( 2 == sram_output_ports.size()) );
/* Create a module and add to the module manager */
ModuleId mem_module = module_manager.add_module(module_name);
VTR_ASSERT(true == module_manager.valid_module_id(mem_module));
/* Add an input port, which is the head of configuration chain in the module */
/* TODO: restriction!!!
* consider only the first input of the CCFF model as the D port,
* which will be connected to the head of the chain
*/
BasicPort chain_head_port(generate_configuration_chain_head_name(),
circuit_lib.port_size(sram_input_ports[0]));
module_manager.add_port(mem_module, chain_head_port, ModuleManager::MODULE_INPUT_PORT);
/* Add an output port, which is the tail of configuration chain in the module */
/* TODO: restriction!!!
* consider only the first output of the CCFF model as the Q port,
* which will be connected to the tail of the chain
*/
BasicPort chain_tail_port(generate_configuration_chain_tail_name(),
circuit_lib.port_size(sram_output_ports[0]));
module_manager.add_port(mem_module, chain_tail_port, ModuleManager::MODULE_OUTPUT_PORT);
/* Add each output port: port width should match the number of memories */
for (size_t iport = 0; iport < sram_output_ports.size(); ++iport) {
std::string port_name;
if (0 == iport) {
port_name = generate_configuration_chain_data_out_name();
} else {
VTR_ASSERT( 1 == iport);
port_name = generate_configuration_chain_inverted_data_out_name();
}
BasicPort output_port(port_name, num_mems);
module_manager.add_port(mem_module, output_port, ModuleManager::MODULE_OUTPUT_PORT);
}
/* Find the sram module in the module manager */
ModuleId sram_mem_module = module_manager.find_module(circuit_lib.model_name(sram_model));
/* Cache the output nets for non-inverted data output */
std::vector<ModuleNetId> mem_output_nets;
/* Instanciate each submodule */
for (size_t i = 0; i < num_mems; ++i) {
size_t sram_mem_instance = module_manager.num_instance(mem_module, sram_mem_module);
module_manager.add_child_module(mem_module, sram_mem_module);
module_manager.add_configurable_child(mem_module, sram_mem_module, sram_mem_instance);
/* Build module nets to wire outputs of sram modules to outputs of memory module */
for (size_t iport = 0; iport < sram_output_ports.size(); ++iport) {
std::string port_name;
if (0 == iport) {
port_name = generate_configuration_chain_data_out_name();
} else {
VTR_ASSERT( 1 == iport);
port_name = generate_configuration_chain_inverted_data_out_name();
}
std::vector<ModuleNetId> output_nets = add_module_output_nets_to_chain_mem_modules(module_manager, mem_module,
port_name, circuit_lib, sram_output_ports[iport],
sram_mem_module, i, sram_mem_instance);
/* Cache only for regular data outputs */
if (0 == iport) {
mem_output_nets.insert(mem_output_nets.end(), output_nets.begin(), output_nets.end());
}
}
}
/* Build module nets to wire the configuration chain */
add_module_nets_to_cmos_memory_chain_module(module_manager, mem_module, mem_output_nets,
circuit_lib, sram_input_ports[0], sram_output_ports[0]);
/* Add global ports to the pb_module:
* This is a much easier job after adding sub modules (instances),
* we just need to find all the global ports from the child modules and build a list of it
*/
add_module_global_ports_from_child_modules(module_manager, mem_module);
}
/*********************************************************************
* Memory bank organization
*
* Bit lines(BL/BLB) Word lines (WL/WLB)
* | |
* v v
* +------------------------------------+
* | Memory Module Configuration port |
* +------------------------------------+
* | | |
* v v v
* +-------+ +-------+ +-------+
* | SRAM | | SRAM | ... | SRAM |
* | [0] | | [1] | | [N-1] |
* +-------+ +-------+ +-------+
* | | ... |
* v v v
* +------------------------------------+
* | Multiplexer Configuration port |
*
********************************************************************/
static
void build_memory_bank_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
const std::string& module_name,
const CircuitModelId& sram_model,
const size_t& num_mems) {
/* Get the global ports required by the SRAM */
std::vector<enum e_circuit_model_port_type> global_port_types;
global_port_types.push_back(CIRCUIT_MODEL_PORT_CLOCK);
global_port_types.push_back(CIRCUIT_MODEL_PORT_INPUT);
std::vector<CircuitPortId> sram_global_ports = circuit_lib.model_global_ports_by_type(sram_model, global_port_types, true, false);
/* Get the input ports from the SRAM */
std::vector<CircuitPortId> sram_input_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_INPUT, true);
/* A SRAM cell with BL/WL should not have any input */
VTR_ASSERT( 0 == sram_input_ports.size() );
/* Get the output ports from the SRAM */
std::vector<CircuitPortId> sram_output_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_OUTPUT, true);
/* Get the BL/WL ports from the SRAM */
std::vector<CircuitPortId> sram_bl_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_BL, true);
std::vector<CircuitPortId> sram_blb_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_BLB, true);
std::vector<CircuitPortId> sram_wl_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_WL, true);
std::vector<CircuitPortId> sram_wlb_ports = circuit_lib.model_ports_by_type(sram_model, CIRCUIT_MODEL_PORT_WLB, true);
/* Create a module and add to the module manager */
ModuleId mem_module = module_manager.add_module(module_name);
VTR_ASSERT(true == module_manager.valid_module_id(mem_module));
/* Add module ports: the ports come from the SRAM modules */
/* Add each input port */
for (const auto& port : sram_input_ports) {
BasicPort input_port(circuit_lib.port_prefix(port), num_mems * circuit_lib.port_size(port));
module_manager.add_port(mem_module, input_port, ModuleManager::MODULE_INPUT_PORT);
}
/* Add each output port: port width should match the number of memories */
for (const auto& port : sram_output_ports) {
BasicPort output_port(circuit_lib.port_prefix(port), num_mems * circuit_lib.port_size(port));
module_manager.add_port(mem_module, output_port, ModuleManager::MODULE_OUTPUT_PORT);
}
/* Add each output port: port width should match the number of memories */
for (const auto& port : sram_bl_ports) {
BasicPort bl_port(circuit_lib.port_prefix(port), num_mems * circuit_lib.port_size(port));
module_manager.add_port(mem_module, bl_port, ModuleManager::MODULE_INPUT_PORT);
}
for (const auto& port : sram_blb_ports) {
BasicPort blb_port(circuit_lib.port_prefix(port), num_mems * circuit_lib.port_size(port));
module_manager.add_port(mem_module, blb_port, ModuleManager::MODULE_INPUT_PORT);
}
for (const auto& port : sram_wl_ports) {
BasicPort wl_port(circuit_lib.port_prefix(port), num_mems * circuit_lib.port_size(port));
module_manager.add_port(mem_module, wl_port, ModuleManager::MODULE_INPUT_PORT);
}
for (const auto& port : sram_wlb_ports) {
BasicPort wlb_port(circuit_lib.port_prefix(port), num_mems * circuit_lib.port_size(port));
module_manager.add_port(mem_module, wlb_port, ModuleManager::MODULE_INPUT_PORT);
}
/* Find the sram module in the module manager */
ModuleId sram_mem_module = module_manager.find_module(circuit_lib.model_name(sram_model));
/* Instanciate each submodule */
for (size_t i = 0; i < num_mems; ++i) {
/* Memory seed module instanciation */
size_t sram_instance = module_manager.num_instance(mem_module, sram_mem_module);
module_manager.add_child_module(mem_module, sram_mem_module);
/* Build module nets */
/* Wire inputs of parent module to inputs of child modules */
add_module_input_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_input_ports, sram_mem_module, i, sram_instance);
/* Wire inputs of parent module to outputs of child modules */
add_module_output_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_output_ports, sram_mem_module, i, sram_instance);
/* Wire BL/WLs of parent module to BL/WLs of child modules */
add_module_input_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_bl_ports, sram_mem_module, i, sram_instance);
add_module_input_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_blb_ports, sram_mem_module, i, sram_instance);
add_module_input_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_wl_ports, sram_mem_module, i, sram_instance);
add_module_input_nets_to_mem_modules(module_manager, mem_module, circuit_lib, sram_wlb_ports, sram_mem_module, i, sram_instance);
}
/* TODO: if a local memory decoder is required, instanciate it here */
/* Add global ports to the pb_module:
* This is a much easier job after adding sub modules (instances),
* we just need to find all the global ports from the child modules and build a list of it
*/
add_module_global_ports_from_child_modules(module_manager, mem_module);
}
/*********************************************************************
* Generate Verilog modules for the memories that are used
* by a circuit model
* The organization of memory circuit will depend on the style of
* configuration protocols
* Currently, we support
* 1. Flat SRAM organization
* 2. Configuration chain
* 3. Memory bank (memory decoders)
********************************************************************/
static
void build_memory_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
const e_config_protocol_type& sram_orgz_type,
const std::string& module_name,
const CircuitModelId& sram_model,
const size_t& num_mems) {
switch (sram_orgz_type) {
case CONFIG_MEM_STANDALONE:
build_memory_standalone_module(module_manager, circuit_lib,
module_name, sram_model, num_mems);
break;
case CONFIG_MEM_SCAN_CHAIN:
build_memory_chain_module(module_manager, circuit_lib,
module_name, sram_model, num_mems);
break;
case CONFIG_MEM_MEMORY_BANK:
build_memory_bank_module(module_manager, circuit_lib,
module_name, sram_model, num_mems);
break;
default:
VTR_LOG_ERROR("Invalid SRAM organization!\n");
exit(1);
}
}
/*********************************************************************
* Generate Verilog modules for the memories that are used
* by multiplexers
*
* +----------------+
* mem_in --->| Memory Module |---> mem_out
* +----------------+
* | | ... | |
* v v v v SRAM ports of multiplexer
* +---------------------+
* in--->| Multiplexer Module |---> out
* +---------------------+
********************************************************************/
static
void build_mux_memory_module(ModuleManager& module_manager,
const CircuitLibrary& circuit_lib,
const e_config_protocol_type& sram_orgz_type,
const CircuitModelId& mux_model,
const MuxGraph& mux_graph) {
/* Find the actual number of configuration bits, based on the mux graph
* Due to the use of local decoders inside mux, this may be
*/
size_t num_config_bits = find_mux_num_config_bits(circuit_lib, mux_model, mux_graph, sram_orgz_type);
/* Multiplexers built with different technology is in different organization */
switch (circuit_lib.design_tech_type(mux_model)) {
case CIRCUIT_MODEL_DESIGN_CMOS: {
/* Generate module name */
std::string module_name = generate_mux_subckt_name(circuit_lib, mux_model,
find_mux_num_datapath_inputs(circuit_lib, mux_model, mux_graph.num_inputs()),
std::string(MEMORY_MODULE_POSTFIX));
/* Get the sram ports from the mux */
std::vector<CircuitModelId> sram_models = find_circuit_sram_models(circuit_lib, mux_model);
VTR_ASSERT( 1 == sram_models.size() );
build_memory_module(module_manager, circuit_lib, sram_orgz_type, module_name, sram_models[0], num_config_bits);
break;
}
case CIRCUIT_MODEL_DESIGN_RRAM:
/* We do not need a memory submodule for RRAM MUX,
* RRAM are embedded in the datapath
* TODO: generate local encoders for RRAM-based multiplexers here!!!
*/
break;
default:
VTR_LOG_ERROR("Invalid design technology of multiplexer '%s'\n",
circuit_lib.model_name(mux_model).c_str());
exit(1);
}
}
/*********************************************************************
* Build modules for
* the memories that are affiliated to multiplexers and other programmable
* circuit models, such as IOPADs, LUTs, etc.
*
* We keep the memory modules separated from the multiplexers and other
* programmable circuit models, for the sake of supporting
* various configuration schemes.
* By following such organiztion, the Verilog modules of the circuit models
* implements the functionality (circuit logic) only, while the memory Verilog
* modules implements the memory circuits as well as configuration protocols.
* For example, the local decoders of multiplexers are implemented in the
* memory modules.
* Take another example, the memory circuit can implement the scan-chain or
* memory-bank organization for the memories.
********************************************************************/
void build_memory_modules(ModuleManager& module_manager,
const MuxLibrary& mux_lib,
const CircuitLibrary& circuit_lib,
const e_config_protocol_type& sram_orgz_type) {
vtr::ScopedStartFinishTimer timer("Build memory modules");
/* Create the memory circuits for the multiplexer */
for (auto mux : mux_lib.muxes()) {
const MuxGraph& mux_graph = mux_lib.mux_graph(mux);
CircuitModelId mux_model = mux_lib.mux_circuit_model(mux);
/* Bypass the non-MUX circuit models (i.e., LUTs).
* They should be handled in a different way
* Memory circuits of LUT includes both regular and mode-select ports
*/
if (CIRCUIT_MODEL_MUX != circuit_lib.model_type(mux_model)) {
continue;
}
/* Create a Verilog module for the memories used by the multiplexer */
build_mux_memory_module(module_manager, circuit_lib, sram_orgz_type, mux_model, mux_graph);
}
/* Create the memory circuits for non-MUX circuit models.
* In this case, the memory modules are designed to interface
* the mode-select ports
*/
for (const auto& model : circuit_lib.models()) {
/* Bypass MUXes, they have already been considered */
if (CIRCUIT_MODEL_MUX == circuit_lib.model_type(model)) {
continue;
}
/* Bypass those modules without any SRAM ports */
std::vector<CircuitPortId> sram_ports = circuit_lib.model_ports_by_type(model, CIRCUIT_MODEL_PORT_SRAM, true);
if (0 == sram_ports.size()) {
continue;
}
/* Find the name of memory module */
/* Get the total number of SRAMs */
size_t num_mems = 0;
for (const auto& port : sram_ports) {
num_mems += circuit_lib.port_size(port);
}
/* Get the circuit model for the memory circuit used by the multiplexer */
std::vector<CircuitModelId> sram_models = find_circuit_sram_models(circuit_lib, model);
/* Should have only 1 SRAM model */
VTR_ASSERT( 1 == sram_models.size() );
/* Create the module name for the memory block */
std::string module_name = generate_memory_module_name(circuit_lib, model, sram_models[0], std::string(MEMORY_MODULE_POSTFIX));
/* Create a Verilog module for the memories used by the circuit model */
build_memory_module(module_manager, circuit_lib, sram_orgz_type, module_name, sram_models[0], num_mems);
}
}
} /* end namespace openfpga */

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#ifndef BUILD_MEMORY_MODULES_H
#define BUILD_MEMORY_MODULES_H
/********************************************************************
* Include header files that are required by function declaration
*******************************************************************/
#include "circuit_library.h"
#include "mux_library.h"
#include "module_manager.h"
/********************************************************************
* Function declaration
*******************************************************************/
/* begin namespace openfpga */
namespace openfpga {
void build_memory_modules(ModuleManager& module_manager,
const MuxLibrary& mux_lib,
const CircuitLibrary& circuit_lib,
const e_config_protocol_type& sram_orgz_type);
} /* end namespace openfpga */
#endif