now SDC to disable routing multiplexer outputs can use wildcards
This commit is contained in:
tangxifan
parent
609115e51f
commit
0e44cf3ea3
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@ -29,6 +29,7 @@
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#include "sdc_writer_naming.h"
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#include "sdc_writer_utils.h"
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#include "sdc_memory_utils.h"
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#include "sdc_mux_utils.h"
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#include "pnr_sdc_global_port.h"
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#include "pnr_sdc_routing_writer.h"
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#include "pnr_sdc_grid_writer.h"
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@ -80,9 +81,11 @@ void print_pnr_sdc_constrain_configurable_memory_outputs(const std::string& sdc_
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*******************************************************************/
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static
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void print_sdc_disable_routing_multiplexer_outputs(const std::string& sdc_dir,
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const bool& flatten_names,
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const MuxLibrary& mux_lib,
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const CircuitLibrary& circuit_lib,
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const ModuleManager& module_manager) {
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const ModuleManager& module_manager,
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const ModuleId& top_module) {
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/* Create the file name for Verilog netlist */
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std::string sdc_fname(sdc_dir + std::string(SDC_DISABLE_MUX_OUTPUTS_FILE_NAME));
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@ -112,16 +115,22 @@ void print_sdc_disable_routing_multiplexer_outputs(const std::string& sdc_dir,
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std::string mux_module_name = generate_mux_subckt_name(circuit_lib, mux_model,
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find_mux_num_datapath_inputs(circuit_lib, mux_model, mux_graph.num_inputs()),
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std::string(""));
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/* Find the module name in module manager */
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ModuleId mux_module = module_manager.find_module(mux_module_name);
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VTR_ASSERT(true == module_manager.valid_module_id(mux_module));
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/* Disable the timing for the output ports */
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for (const BasicPort& output_port : module_manager.module_ports_by_type(mux_module, ModuleManager::MODULE_OUTPUT_PORT)) {
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fp << "set_disable_timing [get_pins -filter \"name =~ " << output_port.get_name() << "*\" ";
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fp << "-of [get_cells -hier -filter \"ref_lib_cell_name == " << mux_module_name << "\"]]" << std::endl;
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fp << std::endl;
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}
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/* Go recursively in the module manager,
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* starting from the top-level module: instance id of the top-level module is 0 by default
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* Disable all the outputs of child modules that matches the mux_module id
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*/
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rec_print_pnr_sdc_disable_routing_multiplexer_outputs(fp,
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flatten_names,
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module_manager,
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top_module,
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mux_module,
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format_dir_path(module_manager.module_name(top_module)));
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}
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/* Close file handler */
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@ -398,14 +407,19 @@ void print_pnr_sdc(const PnrSdcOption& sdc_options,
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/* Output Design Constraints to disable outputs of memory cells */
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if (true == sdc_options.constrain_configurable_memory_outputs()) {
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print_pnr_sdc_constrain_configurable_memory_outputs(sdc_options.sdc_dir(), sdc_options.flatten_names(), module_manager, top_module);
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print_pnr_sdc_constrain_configurable_memory_outputs(sdc_options.sdc_dir(),
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sdc_options.flatten_names(),
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module_manager,
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top_module);
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}
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/* Break loops from Multiplexer Output */
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if (true == sdc_options.constrain_routing_multiplexer_outputs()) {
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print_sdc_disable_routing_multiplexer_outputs(sdc_options.sdc_dir(),
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sdc_options.flatten_names(),
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mux_lib, circuit_lib,
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module_manager);
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module_manager,
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top_module);
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}
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/* Break loops from any SB output */
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@ -0,0 +1,113 @@
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/********************************************************************
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* Most utilized function used to constrain routing multiplexers in FPGA
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* fabric using SDC commands
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*******************************************************************/
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/* Headers from vtrutil library */
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#include "vtr_assert.h"
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#include "vtr_log.h"
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/* Headers from openfpgautil library */
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#include "openfpga_wildcard_string.h"
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#include "openfpga_digest.h"
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#include "openfpga_naming.h"
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#include "sdc_writer_utils.h"
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#include "sdc_mux_utils.h"
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/* begin namespace openfpga */
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namespace openfpga {
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/********************************************************************
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* Print SDC commands to disable outputs of routing multiplexer modules
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* in a given module id
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* This function will be executed in a recursive way,
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* using a Depth-First Search (DFS) strategy
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* It will iterate over all the configurable children under each module
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* and print a SDC command to disable its outputs
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*
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* Note:
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* - When flatten_names is true
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* this function will not apply any wildcard to names
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* - When flatten_names is false
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* It will straightforwardly output the instance name and port name
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* This function will try to apply wildcard to names
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* so that SDC file size can be minimal
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*******************************************************************/
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void rec_print_pnr_sdc_disable_routing_multiplexer_outputs(std::fstream& fp,
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const bool& flatten_names,
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const ModuleManager& module_manager,
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const ModuleId& parent_module,
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const ModuleId& mux_module,
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const std::string& parent_module_path) {
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/* Build wildcard names for the instance names of multiple-instanced-blocks (MIB)
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* We will find all the instance names and see there are common prefix
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* If so, we can use wildcards
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*/
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std::map<ModuleId, std::vector<std::string>> wildcard_names;
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/* For each child, we will go one level down in priority */
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for (const ModuleId& child_module : module_manager.child_modules(parent_module)) {
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std::string child_module_path = parent_module_path;
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/* Iterate over the child instances*/
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for (const size_t& child_instance : module_manager.child_module_instances(parent_module, child_module)) {
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std::string child_instance_name;
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if (true == module_manager.instance_name(parent_module, child_module, child_instance).empty()) {
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child_instance_name = generate_instance_name(module_manager.module_name(child_module), child_instance);
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} else {
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child_instance_name = module_manager.instance_name(parent_module, child_module, child_instance);
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}
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if (false == flatten_names) {
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/* Try to adapt to a wildcard name: replace all the numbers with a wildcard character '*' */
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WildCardString wildcard_str(child_instance_name);
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/* If the wildcard name is already in the list, we can skip this
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* Otherwise, we have to
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* - output this instance
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* - record the wildcard name in the map
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*/
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if ( (0 < wildcard_names.count(child_module))
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&& (wildcard_names.at(child_module).end() != std::find(wildcard_names.at(child_module).begin(),
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wildcard_names.at(child_module).end(),
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wildcard_str.data())) ) {
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continue;
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}
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child_module_path += wildcard_str.data();
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wildcard_names[child_module].push_back(wildcard_str.data());
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} else {
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child_module_path += child_instance_name;
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}
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child_module_path = format_dir_path(child_module_path);
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/* If this is NOT the MUX module we want, we go recursively */
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if (mux_module != child_module) {
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rec_print_pnr_sdc_disable_routing_multiplexer_outputs(fp, flatten_names,
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module_manager,
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child_module,
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mux_module,
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child_module_path);
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continue;
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}
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/* Validate file stream */
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valid_file_stream(fp);
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/* Reach here, this is the MUX module we want, disable the outputs */
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for (const BasicPort& output_port : module_manager.module_ports_by_type(mux_module, ModuleManager::MODULE_OUTPUT_PORT)) {
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fp << "set_disable_timing ";
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fp << child_module_path << output_port.get_name();
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fp << std::endl;
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}
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}
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}
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}
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} /* end namespace openfpga */
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@ -0,0 +1,28 @@
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#ifndef SDC_MUX_UTILS_H
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#define SDC_MUX_UTILS_H
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/********************************************************************
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* Include header files that are required by function declaration
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*******************************************************************/
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#include <fstream>
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#include <string>
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#include "module_manager.h"
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/********************************************************************
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* Function declaration
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*******************************************************************/
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/* begin namespace openfpga */
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namespace openfpga {
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void rec_print_pnr_sdc_disable_routing_multiplexer_outputs(std::fstream& fp,
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const bool& flatten_names,
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const ModuleManager& module_manager,
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const ModuleId& parent_module,
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const ModuleId& mux_module,
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const std::string& parent_module_path);
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} /* end namespace openfpga */
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#endif
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