mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-11-04 05:19:11 +00:00
Code Activity

clk2fflogic: work for bit-level $_DFF_* and $_DFFSR_*

Browse source
This commit is contained in:
Eddie Hung 2020-01-15 09:51:31 -08:00
parent ffd6f54f92
commit e30b6bbbf8
2 changed files with 116 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

83
passes/sat/clk2fflogic.cc
View file

@ -214,14 +214,38 @@ struct Clk2fflogicPass : public Pass {
continue;
}
if (cell->type.in("$dff", "$adff", "$dffsr"))
bool word_dff = cell->type.in("$dff", "$adff", "$dffsr");
if (word_dff || cell->type.in(ID($_DFF_N_), ID($_DFF_P_),
ID($_DFF_NN0_), ID($_DFF_NN1_), ID($_DFF_NP0_), ID($_DFF_NP1_),
ID($_DFF_PP0_), ID($_DFF_PP1_), ID($_DFF_PN0_), ID($_DFF_PN1_),
ID($_DFFSR_NNN_), ID($_DFFSR_NNP_), ID($_DFFSR_NPN_), ID($_DFFSR_NPP_),
ID($_DFFSR_PNN_), ID($_DFFSR_PNP_), ID($_DFFSR_PPN_), ID($_DFFSR_PPP_)))
{
bool clkpol = cell->parameters["\\CLK_POLARITY"].as_bool();
bool clkpol;
SigSpec clk;
if (word_dff) {
clkpol = cell->parameters["\\CLK_POLARITY"].as_bool();
clk = cell->getPort("\\CLK");
}
else {
if (cell->type.in(ID($_DFF_P_), ID($_DFF_N_),
ID($_DFF_NN0_), ID($_DFF_NN1_), ID($_DFF_NP0_), ID($_DFF_NP1_),
ID($_DFF_PP0_), ID($_DFF_PP1_), ID($_DFF_PN0_), ID($_DFF_PN1_)))
clkpol = cell->type[6] == 'P';
else if (cell->type.in(ID($_DFFSR_NNN_), ID($_DFFSR_NNP_), ID($_DFFSR_NPN_), ID($_DFFSR_NPP_),
ID($_DFFSR_PNN_), ID($_DFFSR_PNP_), ID($_DFFSR_PPN_), ID($_DFFSR_PPP_)))
clkpol = cell->type[8] == 'P';
else log_abort();
clk = cell->getPort("\\C");
}
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);
if (word_dff)
module->addFf(NEW_ID, clk, past_clk);
else
module->addFfGate(NEW_ID, clk, past_clk);
SigSpec sig_d = cell->getPort("\\D");
SigSpec sig_q = cell->getPort("\\Q");
@ -244,8 +268,14 @@ struct Clk2fflogicPass : public Pass {
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 (word_dff) {
module->addFf(NEW_ID, sig_d, past_d);
module->addFf(NEW_ID, sig_q, past_q);
}
else {
module->addFfGate(NEW_ID, sig_d, past_d);
module->addFfGate(NEW_ID, sig_q, past_q);
}
if (cell->type == "$adff")
{
@ -266,6 +296,26 @@ struct Clk2fflogicPass : public Pass {
module->addMux(NEW_ID, rstval, qval, arst, sig_q);
}
else
if (cell->type.in(ID($_DFF_NN0_), ID($_DFF_NN1_), ID($_DFF_NP0_), ID($_DFF_NP1_),
ID($_DFF_PP0_), ID($_DFF_PP1_), ID($_DFF_PN0_), ID($_DFF_PN1_)))
{
SigSpec arst = cell->getPort("\\R");
SigSpec qval = module->MuxGate(NEW_ID, past_q, past_d, clock_edge);
SigBit rstval = (cell->type[8] == '1');
Wire *past_arst = module->addWire(NEW_ID);
module->addFfGate(NEW_ID, arst, past_arst);
if (cell->type[7] == 'P')
arst = module->OrGate(NEW_ID, arst, past_arst);
else
arst = module->AndGate(NEW_ID, arst, past_arst);
if (cell->type[7] == 'P')
module->addMuxGate(NEW_ID, qval, rstval, arst, sig_q);
else
module->addMuxGate(NEW_ID, rstval, qval, arst, sig_q);
}
else
if (cell->type == "$dffsr")
{
SigSpec qval = module->Mux(NEW_ID, past_q, past_d, clock_edge);
@ -282,9 +332,30 @@ struct Clk2fflogicPass : public Pass {
module->addAnd(NEW_ID, qval, clrval, sig_q);
}
else
if (cell->type.in(ID($_DFFSR_NNN_), ID($_DFFSR_NNP_), ID($_DFFSR_NPN_), ID($_DFFSR_NPP_),
ID($_DFFSR_PNN_), ID($_DFFSR_PNP_), ID($_DFFSR_PPN_), ID($_DFFSR_PPP_)))
{
SigSpec qval = module->MuxGate(NEW_ID, past_q, past_d, clock_edge);
SigSpec setval = cell->getPort("\\S");
SigSpec clrval = cell->getPort("\\R");
if (cell->type[9] != 'P')
setval = module->Not(NEW_ID, setval);
if (cell->type[10] == 'P')
clrval = module->Not(NEW_ID, clrval);
qval = module->OrGate(NEW_ID, qval, setval);
module->addAndGate(NEW_ID, qval, clrval, sig_q);
}
else if (cell->type == "$dff")
{
module->addMux(NEW_ID, past_q, past_d, clock_edge, sig_q);
}
else
{
module->addMuxGate(NEW_ID, past_q, past_d, clock_edge, sig_q);
}
Const initval;
bool assign_initval = false;