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yosys/passes/sat/clk2fflogic.cc

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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/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct Clk2fflogicPass : public Pass {
Clk2fflogicPass() : Pass("clk2fflogic", "convert clocked FFs to generic $ff cells") { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" clk2fflogic [options] [selection]\n");
log("\n");
log("This command replaces clocked flip-flops with generic $ff cells that use the\n");
log("implicit global clock. This is useful for formal verification of designs with\n");
log("multiple clocks.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
// bool flag_noinit = false;
log_header(design, "Executing CLK2FFLOGIC pass (convert clocked FFs to generic $ff cells).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
// if (args[argidx] == "-noinit") {
// flag_noinit = true;
// continue;
// }
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
{
SigMap sigmap(module);
dict<SigBit, State> initbits;
pool<SigBit> del_initbits;
for (auto wire : module->wires())
if (wire->attributes.count("\\init") > 0)
{
Const initval = wire->attributes.at("\\init");
SigSpec initsig = sigmap(wire);
for (int i = 0; i < GetSize(initval) && i < GetSize(initsig); i++)
if (initval[i] == State::S0 || initval[i] == State::S1)
initbits[initsig[i]] = initval[i];
}
for (auto cell : vector<Cell*>(module->selected_cells()))
{
if (cell->type.in("$mem"))
{
int abits = cell->getParam("\\ABITS").as_int();
int width = cell->getParam("\\WIDTH").as_int();
int rd_ports = cell->getParam("\\RD_PORTS").as_int();
int wr_ports = cell->getParam("\\WR_PORTS").as_int();
for (int i = 0; i < rd_ports; i++) {
if (cell->getParam("\\RD_CLK_ENABLE").extract(i).as_bool())
log_error("Read port %d of memory %s.%s is clocked. This is not supported by \"clk2fflogic\"! "
"Call \"memory\" with -nordff to avoid this error.\n", i, log_id(cell), log_id(module));
}
Const wr_clk_en_param = cell->getParam("\\WR_CLK_ENABLE");
Const wr_clk_pol_param = cell->getParam("\\WR_CLK_POLARITY");
SigSpec wr_clk_port = cell->getPort("\\WR_CLK");
SigSpec wr_en_port = cell->getPort("\\WR_EN");
SigSpec wr_addr_port = cell->getPort("\\WR_ADDR");
SigSpec wr_data_port = cell->getPort("\\WR_DATA");
for (int wport = 0; wport < wr_ports; wport++)
{
bool clken = wr_clk_en_param[wport] == State::S1;
bool clkpol = wr_clk_pol_param[wport] == State::S1;
if (!clken)
continue;
SigBit clk = wr_clk_port[wport];
SigSpec en = wr_en_port.extract(wport*width, width);
SigSpec addr = wr_addr_port.extract(wport*abits, abits);
SigSpec data = wr_data_port.extract(wport*width, width);
log("Modifying write port %d on memory %s.%s: CLK=%s, A=%s, D=%s\n",
wport, log_id(module), log_id(cell), log_signal(clk),
log_signal(addr), log_signal(data));
Wire *past_clk = module->addWire(NEW_ID);
past_clk->attributes["\\init"] = clkpol ? State::S1 : State::S0;
module->addFf(NEW_ID, clk, past_clk);
SigSpec clock_edge_pattern;
if (clkpol) {
clock_edge_pattern.append_bit(State::S0);
clock_edge_pattern.append_bit(State::S1);
} else {
clock_edge_pattern.append_bit(State::S1);
clock_edge_pattern.append_bit(State::S0);
}
SigSpec clock_edge = module->Eqx(NEW_ID, {clk, SigSpec(past_clk)}, clock_edge_pattern);
SigSpec en_q = module->addWire(NEW_ID, GetSize(en));
module->addFf(NEW_ID, en, en_q);
SigSpec addr_q = module->addWire(NEW_ID, GetSize(addr));
module->addFf(NEW_ID, addr, addr_q);
SigSpec data_q = module->addWire(NEW_ID, GetSize(data));
module->addFf(NEW_ID, data, data_q);
wr_clk_port[wport] = State::S0;
wr_en_port.replace(wport*width, module->Mux(NEW_ID, Const(0, GetSize(en_q)), en_q, clock_edge));
wr_addr_port.replace(wport*abits, addr_q);
wr_data_port.replace(wport*width, data_q);
wr_clk_en_param[wport] = State::S0;
wr_clk_pol_param[wport] = State::S0;
}
cell->setParam("\\WR_CLK_ENABLE", wr_clk_en_param);
cell->setParam("\\WR_CLK_POLARITY", wr_clk_pol_param);
cell->setPort("\\WR_CLK", wr_clk_port);
cell->setPort("\\WR_EN", wr_en_port);
cell->setPort("\\WR_ADDR", wr_addr_port);
cell->setPort("\\WR_DATA", wr_data_port);
}
if (cell->type.in("$dlatch", "$dlatchsr"))
{
bool enpol = cell->parameters["\\EN_POLARITY"].as_bool();
SigSpec sig_en = cell->getPort("\\EN");
SigSpec sig_d = cell->getPort("\\D");
SigSpec sig_q = cell->getPort("\\Q");
log("Replacing %s.%s (%s): EN=%s, D=%s, Q=%s\n",
log_id(module), log_id(cell), log_id(cell->type),
log_signal(sig_en), log_signal(sig_d), log_signal(sig_q));
Wire *past_q = module->addWire(NEW_ID, GetSize(sig_q));
module->addFf(NEW_ID, sig_q, past_q);
if (cell->type == "$dlatch")
{
if (enpol)
module->addMux(NEW_ID, past_q, sig_d, sig_en, sig_q);
else
module->addMux(NEW_ID, sig_d, past_q, sig_en, sig_q);
}
else
{
SigSpec t;
if (enpol)
t = module->Mux(NEW_ID, past_q, sig_d, sig_en);
else
t = module->Mux(NEW_ID, sig_d, past_q, sig_en);
SigSpec s = cell->getPort("\\SET");
if (!cell->parameters["\\SET_POLARITY"].as_bool())
s = module->Not(NEW_ID, s);
t = module->Or(NEW_ID, t, s);
SigSpec c = cell->getPort("\\CLR");
if (cell->parameters["\\CLR_POLARITY"].as_bool())
c = module->Not(NEW_ID, c);
module->addAnd(NEW_ID, t, c, sig_q);
}
Const initval;
bool assign_initval = false;
for (int i = 0; i < GetSize(sig_d); i++) {
SigBit qbit = sigmap(sig_q[i]);
if (initbits.count(qbit)) {
initval.bits.push_back(initbits.at(qbit));
del_initbits.insert(qbit);
} else
initval.bits.push_back(State::Sx);
if (initval.bits.back() != State::Sx)
assign_initval = true;
}
if (assign_initval)
past_q->attributes["\\init"] = initval;
module->remove(cell);
continue;
}
if (cell->type.in("$dff", "$adff", "$dffsr"))
{
bool clkpol = cell->parameters["\\CLK_POLARITY"].as_bool();
SigSpec clk = cell->getPort("\\CLK");
Wire *past_clk = module->addWire(NEW_ID);
past_clk->attributes["\\init"] = clkpol ? State::S1 : State::S0;
module->addFf(NEW_ID, clk, past_clk);
SigSpec sig_d = cell->getPort("\\D");
SigSpec sig_q = cell->getPort("\\Q");
log("Replacing %s.%s (%s): CLK=%s, D=%s, Q=%s\n",
log_id(module), log_id(cell), log_id(cell->type),
log_signal(clk), log_signal(sig_d), log_signal(sig_q));
SigSpec clock_edge_pattern;
if (clkpol) {
clock_edge_pattern.append_bit(State::S0);
clock_edge_pattern.append_bit(State::S1);
} else {
clock_edge_pattern.append_bit(State::S1);
clock_edge_pattern.append_bit(State::S0);
}
SigSpec clock_edge = module->Eqx(NEW_ID, {clk, SigSpec(past_clk)}, clock_edge_pattern);
Wire *past_d = module->addWire(NEW_ID, GetSize(sig_d));
Wire *past_q = module->addWire(NEW_ID, GetSize(sig_q));
module->addFf(NEW_ID, sig_d, past_d);
module->addFf(NEW_ID, sig_q, past_q);
if (cell->type == "$adff")
{
SigSpec arst = cell->getPort("\\ARST");
SigSpec qval = module->Mux(NEW_ID, past_q, past_d, clock_edge);
Const rstval = cell->parameters["\\ARST_VALUE"];
Wire *past_arst = module->addWire(NEW_ID);
module->addFf(NEW_ID, arst, past_arst);
if (cell->parameters["\\ARST_POLARITY"].as_bool())
arst = module->LogicOr(NEW_ID, arst, past_arst);
else
arst = module->LogicAnd(NEW_ID, arst, past_arst);
if (cell->parameters["\\ARST_POLARITY"].as_bool())
module->addMux(NEW_ID, qval, rstval, arst, sig_q);
else
module->addMux(NEW_ID, rstval, qval, arst, sig_q);
}
else
if (cell->type == "$dffsr")
{
SigSpec qval = module->Mux(NEW_ID, past_q, past_d, clock_edge);
SigSpec setval = cell->getPort("\\SET");
SigSpec clrval = cell->getPort("\\CLR");
if (!cell->parameters["\\SET_POLARITY"].as_bool())
setval = module->Not(NEW_ID, setval);
if (cell->parameters["\\CLR_POLARITY"].as_bool())
clrval = module->Not(NEW_ID, clrval);
qval = module->Or(NEW_ID, qval, setval);
module->addAnd(NEW_ID, qval, clrval, sig_q);
}
else
{
module->addMux(NEW_ID, past_q, past_d, clock_edge, sig_q);
}
Const initval;
bool assign_initval = false;
for (int i = 0; i < GetSize(sig_d); i++) {
SigBit qbit = sigmap(sig_q[i]);
if (initbits.count(qbit)) {
initval.bits.push_back(initbits.at(qbit));
del_initbits.insert(qbit);
} else
initval.bits.push_back(State::Sx);
if (initval.bits.back() != State::Sx)
assign_initval = true;
}
if (assign_initval) {
past_d->attributes["\\init"] = initval;
past_q->attributes["\\init"] = initval;
}
module->remove(cell);
continue;
}
}
for (auto wire : module->wires())
if (wire->attributes.count("\\init") > 0)
{
bool delete_initattr = true;
Const initval = wire->attributes.at("\\init");
SigSpec initsig = sigmap(wire);
for (int i = 0; i < GetSize(initval) && i < GetSize(initsig); i++)
if (del_initbits.count(initsig[i]) > 0)
initval[i] = State::Sx;
else if (initval[i] != State::Sx)
delete_initattr = false;
if (delete_initattr)
wire->attributes.erase("\\init");
else
wire->attributes.at("\\init") = initval;
}
}
}
} Clk2fflogicPass;
PRIVATE_NAMESPACE_END
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