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Regfile.h
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Regfile.h
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// See LICENSE for license details.
#include "simif_peek_poke.h"
#include <stdio.h>
#include <stdlib.h>
#include <map>
#include <utility>
constexpr size_t reg_n_reads = 2;
constexpr size_t reg_n_writes = 2;
const size_t reg_w_addr_ios[reg_n_writes] = {io_writes_0_addr,
io_writes_1_addr};
const size_t reg_w_data_ios[reg_n_writes] = {io_writes_0_data,
io_writes_1_data};
const size_t reg_w_en_ios[reg_n_writes] = {io_writes_0_en, io_writes_1_en};
const size_t reg_r_addr_ios[reg_n_reads] = {io_reads_0_addr, io_reads_1_addr};
const size_t reg_r_data_ios[reg_n_reads] = {io_reads_0_data, io_reads_1_data};
struct Regfile_t : public simif_peek_poke_t {
Regfile_t(int argc, char **argv) {}
void run() {
target_reset();
for (size_t cycle = 0; cycle < 100; cycle++) {
do_iteration(cycle);
}
}
private:
size_t mem_depth = 10;
void do_iteration(size_t cycle_num) {
for (size_t w_idx = 0; w_idx < reg_n_writes; w_idx++) {
if (rand() % 2) {
uint32_t rand_data = rand();
uint32_t rand_addr = rand() % mem_depth;
while (history.count(rand_addr) &&
history[rand_addr].second == cycle_num) {
// already written this cycle => would be undefined write collision
rand_addr = rand() % mem_depth;
}
history[rand_addr] = std::make_pair(rand_data, cycle_num);
poke(reg_w_addr_ios[w_idx], rand_addr);
poke(reg_w_data_ios[w_idx], rand_data);
poke(reg_w_en_ios[w_idx], 1);
} else {
poke(reg_w_en_ios[w_idx], 0);
}
}
for (size_t r_idx = 0; r_idx < reg_n_reads; r_idx++) {
uint32_t rand_addr = rand() % mem_depth;
prev_reads[r_idx] = rand_addr;
poke(reg_r_addr_ios[r_idx], rand_addr);
}
step(1);
for (size_t r_idx = 0; r_idx < reg_n_reads; r_idx++) {
uint32_t prev_addr = prev_reads[r_idx];
if (history.count(prev_addr)) {
expect(reg_r_data_ios[r_idx], history[prev_addr].first);
}
}
}
private:
std::map<uint32_t, std::pair<uint32_t, size_t>> history;
std::map<size_t, uint32_t> prev_reads;
};