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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/register.h"
#include "kernel/log.h"
#include <sstream>
#include <algorithm>
#include <stdlib.h>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
void handle_memory(RTLIL::Module *module, RTLIL::Cell *memory)
{
log("Creating $memrd and $memwr for memory `%s' in module `%s':\n",
memory->name.c_str(), module->name.c_str());
RTLIL::IdString mem_name = RTLIL::escape_id(memory->parameters.at("\\MEMID").decode_string());
while (module->memories.count(mem_name) != 0)
mem_name = mem_name.str() + stringf("_%d", autoidx++);
RTLIL::Memory *mem = new RTLIL::Memory;
mem->name = mem_name;
mem->width = memory->parameters.at("\\WIDTH").as_int();
mem->start_offset = memory->parameters.at("\\OFFSET").as_int();
mem->size = memory->parameters.at("\\SIZE").as_int();
module->memories[mem_name] = mem;
int abits = memory->parameters.at("\\ABITS").as_int();
int num_rd_ports = memory->parameters.at("\\RD_PORTS").as_int();
int num_wr_ports = memory->parameters.at("\\WR_PORTS").as_int();
for (int i = 0; i < num_rd_ports; i++)
{
RTLIL::Cell *cell = module->addCell(NEW_ID, "$memrd");
cell->parameters["\\MEMID"] = mem_name.str();
cell->parameters["\\ABITS"] = memory->parameters.at("\\ABITS");
cell->parameters["\\WIDTH"] = memory->parameters.at("\\WIDTH");
cell->parameters["\\CLK_ENABLE"] = RTLIL::SigSpec(memory->parameters.at("\\RD_CLK_ENABLE")).extract(i, 1).as_const();
cell->parameters["\\CLK_POLARITY"] = RTLIL::SigSpec(memory->parameters.at("\\RD_CLK_POLARITY")).extract(i, 1).as_const();
cell->parameters["\\TRANSPARENT"] = RTLIL::SigSpec(memory->parameters.at("\\RD_TRANSPARENT")).extract(i, 1).as_const();
cell->setPort("\\CLK", memory->getPort("\\RD_CLK").extract(i, 1));
cell->setPort("\\EN", memory->getPort("\\RD_EN").extract(i, 1));
cell->setPort("\\ADDR", memory->getPort("\\RD_ADDR").extract(i*abits, abits));
cell->setPort("\\DATA", memory->getPort("\\RD_DATA").extract(i*mem->width, mem->width));
}
for (int i = 0; i < num_wr_ports; i++)
{
RTLIL::Cell *cell = module->addCell(NEW_ID, "$memwr");
cell->parameters["\\MEMID"] = mem_name.str();
cell->parameters["\\ABITS"] = memory->parameters.at("\\ABITS");
cell->parameters["\\WIDTH"] = memory->parameters.at("\\WIDTH");
cell->parameters["\\CLK_ENABLE"] = RTLIL::SigSpec(memory->parameters.at("\\WR_CLK_ENABLE")).extract(i, 1).as_const();
cell->parameters["\\CLK_POLARITY"] = RTLIL::SigSpec(memory->parameters.at("\\WR_CLK_POLARITY")).extract(i, 1).as_const();
cell->parameters["\\PRIORITY"] = i;
cell->setPort("\\CLK", memory->getPort("\\WR_CLK").extract(i, 1));
cell->setPort("\\EN", memory->getPort("\\WR_EN").extract(i*mem->width, mem->width));
cell->setPort("\\ADDR", memory->getPort("\\WR_ADDR").extract(i*abits, abits));
cell->setPort("\\DATA", memory->getPort("\\WR_DATA").extract(i*mem->width, mem->width));
}
Const initval = memory->parameters.at("\\INIT");
RTLIL::Cell *last_init_cell = nullptr;
SigSpec last_init_data;
int last_init_addr=0;
for (int i = 0; i < GetSize(initval) && i/mem->width < (1 << abits); i += mem->width) {
Const val = initval.extract(i, mem->width, State::Sx);
for (auto bit : val.bits)
if (bit != State::Sx)
goto found_non_undef_initval;
continue;
found_non_undef_initval:
if (last_init_cell && last_init_addr+1 == i/mem->width) {
last_init_cell->parameters["\\WORDS"] = last_init_cell->parameters["\\WORDS"].as_int() + 1;
last_init_data.append(val);
last_init_addr++;
} else {
if (last_init_cell)
last_init_cell->setPort("\\DATA", last_init_data);
RTLIL::Cell *cell = module->addCell(NEW_ID, "$meminit");
cell->parameters["\\MEMID"] = mem_name.str();
cell->parameters["\\ABITS"] = memory->parameters.at("\\ABITS");
cell->parameters["\\WIDTH"] = memory->parameters.at("\\WIDTH");
cell->parameters["\\WORDS"] = 1;
cell->parameters["\\PRIORITY"] = i/mem->width;
cell->setPort("\\ADDR", SigSpec(i/mem->width, abits));
last_init_cell = cell;
last_init_addr = i/mem->width;
last_init_data = val;
}
}
if (last_init_cell)
last_init_cell->setPort("\\DATA", last_init_data);
module->remove(memory);
}
void handle_module(RTLIL::Design *design, RTLIL::Module *module)
{
std::vector<RTLIL::IdString> memcells;
for (auto &cell_it : module->cells_)
if (cell_it.second->type == "$mem" && design->selected(module, cell_it.second))
memcells.push_back(cell_it.first);
for (auto &it : memcells)
handle_memory(module, module->cells_.at(it));
}
struct MemoryUnpackPass : public Pass {
MemoryUnpackPass() : Pass("memory_unpack", "unpack multi-port memory cells") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" memory_unpack [selection]\n");
log("\n");
log("This pass converts the multi-port $mem memory cells into individual $memrd and\n");
log("$memwr cells. It is the counterpart to the memory_collect pass.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) {
log_header("Executing MEMORY_UNPACK pass (generating $memrd/$memwr cells form $mem cells).\n");
extra_args(args, 1, design);
for (auto &mod_it : design->modules_)
if (design->selected(mod_it.second))
handle_module(design, mod_it.second);
}
} MemoryUnpackPass;
PRIVATE_NAMESPACE_END
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