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[FPGA-Verilog] Now consider clock constraints for BL/WL shift registers

This commit is contained in:
tangxifan 2021-10-06 11:39:28 -07:00
parent 95b877924a
commit 82ed6b177b
3 changed files with 116 additions and 40 deletions
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25
openfpga/src/fpga_verilog/verilog_top_testbench.cpp
View File

@ -11,6 +11,9 @@
#include "vtr_assert.h"
#include "vtr_time.h"
/* Headers from openfpgashell library */
#include "command_exit_codes.h"
/* Headers from openfpgautil library */
#include "openfpga_port.h"
#include "openfpga_digest.h"
@ -1121,8 +1124,9 @@ void print_verilog_top_testbench_generic_stimulus(std::fstream& fp,
* 1. the enable signal
*******************************************************************/
static
void print_verilog_top_testbench_configuration_protocol_stimulus(std::fstream& fp,
int print_verilog_top_testbench_configuration_protocol_stimulus(std::fstream& fp,
const ConfigProtocol& config_protocol,
const SimulationSetting& sim_settings,
const ModuleManager& module_manager,
const ModuleId& top_module,
const bool& fast_configuration,
@ -1140,9 +1144,9 @@ void print_verilog_top_testbench_configuration_protocol_stimulus(std::fstream& f
case CONFIG_MEM_SCAN_CHAIN:
break;
case CONFIG_MEM_QL_MEMORY_BANK:
print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(fp,
config_protocol,
module_manager,top_module,
return print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(fp,
config_protocol, sim_settings,
module_manager, top_module,
fast_configuration, bit_value_to_skip, fabric_bitstream,
prog_clock_period, timescale);
break;
@ -1166,6 +1170,8 @@ void print_verilog_top_testbench_configuration_protocol_stimulus(std::fstream& f
"Invalid SRAM organization type!\n");
exit(1);
}
return CMD_EXEC_SUCCESS;
}
/********************************************************************
@ -1974,13 +1980,18 @@ int print_verilog_full_testbench(const ModuleManager& module_manager,
VERILOG_SIM_TIMESCALE);
/* Generate stimuli for programming interface */
print_verilog_top_testbench_configuration_protocol_stimulus(fp,
config_protocol,
int status = CMD_EXEC_SUCCESS;
status = print_verilog_top_testbench_configuration_protocol_stimulus(fp,
config_protocol, simulation_parameters,
module_manager, top_module,
fast_configuration, bit_value_to_skip, fabric_bitstream,
prog_clock_period,
VERILOG_SIM_TIMESCALE);
if (status == CMD_EXEC_FATAL_ERROR) {
return status;
}
/* Identify the stimulus for global reset/set for programming purpose:
* - If only reset port is seen we turn on Reset
* - If only set port is seen we turn on Reset
@ -2124,7 +2135,7 @@ int print_verilog_full_testbench(const ModuleManager& module_manager,
/* Close the file stream */
fp.close();
return 0;
return status;
}

68
openfpga/src/fpga_verilog/verilog_top_testbench_memory_bank.cpp
View File

@ -11,7 +11,11 @@
#include "vtr_assert.h"
#include "vtr_time.h"
/* Headers from openfpgashell library */
#include "command_exit_codes.h"
/* Headers from openfpgautil library */
#include "openfpga_scale.h"
#include "openfpga_port.h"
#include "openfpga_digest.h"
@ -279,8 +283,41 @@ void print_verilog_full_testbench_ql_memory_bank_shift_register_clock_generator(
fp << std::endl;
}
void print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(std::fstream& fp,
/**
* @brief Update the clock period of shift register chain by considering the constraints from simulation settings
* - If the frequency is lower than the pre-computed bound, we should error out! Shift register chain cannot load the data completely
* - If the frequency is higher than the pre-computed bound, we use the contrained frequency
* @param sr_clock_port is the clock port which expect constraints
* @param sr_clock_period is the pre-constrained clock period. It is also the final clock period which will be return (if updated)
*/
static
int constrain_blwl_shift_register_clock_period_from_simulation_settings(const SimulationSetting& sim_settings,
const BasicPort& sr_clock_port,
const float& timescale,
float& sr_clock_period) {
for (const SimulationClockId& sim_clk : sim_settings.programming_shift_register_clocks()) {
/* Bypass all the clocks which does not match */
if (sim_settings.clock_port(sim_clk) == sr_clock_port) {
if (sr_clock_period > 0.5 * (1 / sim_settings.clock_frequency(sim_clk)) / timescale) {
VTR_LOG_ERROR("Constrained clock frequency for BL shift registers is lower than the minimum requirement (%g %s[Hz])! Shift register chain cannot load data completely!\n",
1. / (2. * sr_clock_period) / 1e6,
time_unit_to_string(1e6).c_str());
return CMD_EXEC_FATAL_ERROR;
} else {
sr_clock_period = 0.5 * (1. / sim_settings.clock_frequency(sim_clk)) / timescale;
VTR_LOG("Will use constrained clock frequency (=%g %s[Hz]) for %s.\n",
sim_settings.clock_frequency(sim_clk) / 1e6,
time_unit_to_string(1e6).c_str(),
sr_clock_port.get_name().c_str());
}
}
}
return CMD_EXEC_SUCCESS;
}
int print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(std::fstream& fp,
const ConfigProtocol& config_protocol,
const SimulationSetting& sim_settings,
const ModuleManager& module_manager,
const ModuleId& top_module,
const bool& fast_configuration,
@ -313,13 +350,38 @@ void print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(
fast_configuration,
bit_value_to_skip);
/* TODO: Consider auto-tuned clock period for now:
/* Compute the auto-tuned clock period first, this is the lower bound of the shift register clock periods:
* - the BL/WL shift register clock only works in the second half of the programming clock period
* - add 2 idle clocks to avoid racing between programming clock and shift register clocks at edge
*/
float bl_sr_clock_period = 0.25 * prog_clock_period / (fabric_bits_by_addr.bl_word_size() + 2) / timescale;
float wl_sr_clock_period = 0.25 * prog_clock_period / (fabric_bits_by_addr.wl_word_size() + 2) / timescale;
VTR_LOG("Precomputed clock frequency (=%g %s[Hz]) for %s.\n",
1. / (2. * bl_sr_clock_period) / 1e6,
time_unit_to_string(1e6).c_str(),
bl_sr_clock_port.get_name().c_str());
VTR_LOG("Precomputed clock frequency (=%g %s[Hz]) for %s.\n",
1. / (2. * wl_sr_clock_period) / 1e6,
time_unit_to_string(1e6).c_str(),
wl_sr_clock_port.get_name().c_str());
if (CMD_EXEC_FATAL_ERROR == constrain_blwl_shift_register_clock_period_from_simulation_settings(sim_settings,
bl_sr_clock_port,
timescale,
bl_sr_clock_period)) {
return CMD_EXEC_FATAL_ERROR;
}
if (CMD_EXEC_FATAL_ERROR == constrain_blwl_shift_register_clock_period_from_simulation_settings(sim_settings,
wl_sr_clock_port,
timescale,
wl_sr_clock_period)) {
return CMD_EXEC_FATAL_ERROR;
}
if (BLWL_PROTOCOL_SHIFT_REGISTER == config_protocol.bl_protocol_type()) {
print_verilog_comment(fp, "----- BL Shift register clock generator -----");
print_verilog_full_testbench_ql_memory_bank_shift_register_clock_generator(fp, start_bl_sr_port, bl_sr_clock_port, bl_sr_clock_period);
@ -330,6 +392,8 @@ void print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(
print_verilog_full_testbench_ql_memory_bank_shift_register_clock_generator(fp, start_wl_sr_port, wl_sr_clock_port, wl_sr_clock_period);
}
}
return CMD_EXEC_SUCCESS;
}
/* Verilog codes to load bitstream from a bit file for memory bank using flatten BL/WLs */

3
openfpga/src/fpga_verilog/verilog_top_testbench_memory_bank.h
View File

@ -45,8 +45,9 @@ void print_verilog_top_testbench_global_shift_register_clock_ports_stimuli(std::
/**
* @brief Generate the Verilog codes that generate stimuli waveforms for BL/WL protocols
*/
void print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(std::fstream& fp,
int print_verilog_top_testbench_configuration_protocol_ql_memory_bank_stimulus(std::fstream& fp,
const ConfigProtocol& config_protocol,
const SimulationSetting& sim_settings,
const ModuleManager& module_manager,
const ModuleId& top_module,
const bool& fast_configuration,