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+/*
+ * yosys -- Yosys Open SYnthesis Suite
+ *
+ * Copyright (C) 2020 Marcelina Kościelnicka <mwk@0x04.net>
+ *
+ * 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/ff.h"
+
+USING_YOSYS_NAMESPACE
+
+FfData::FfData(FfInitVals *initvals, Cell *cell_) : FfData(cell_->module, initvals, cell_->name)
+{
+ cell = cell_;
+ sig_q = cell->getPort(ID::Q);
+ width = GetSize(sig_q);
+ attributes = cell->attributes;
+
+ if (initvals)
+ val_init = (*initvals)(sig_q);
+
+ std::string type_str = cell->type.str();
+
+ if (cell->type.in(ID($ff), ID($dff), ID($dffe), ID($dffsr), ID($dffsre), ID($adff), ID($adffe), ID($aldff), ID($aldffe), ID($sdff), ID($sdffe), ID($sdffce), ID($dlatch), ID($adlatch), ID($dlatchsr), ID($sr))) {
+ if (cell->type == ID($ff)) {
+ has_gclk = true;
+ sig_d = cell->getPort(ID::D);
+ } else if (cell->type == ID($sr)) {
+ // No data input at all.
+ } else if (cell->type.in(ID($dlatch), ID($adlatch), ID($dlatchsr))) {
+ has_aload = true;
+ sig_aload = cell->getPort(ID::EN);
+ pol_aload = cell->getParam(ID::EN_POLARITY).as_bool();
+ sig_ad = cell->getPort(ID::D);
+ } else {
+ has_clk = true;
+ sig_clk = cell->getPort(ID::CLK);
+ pol_clk = cell->getParam(ID::CLK_POLARITY).as_bool();
+ sig_d = cell->getPort(ID::D);
+ }
+ if (cell->type.in(ID($dffe), ID($dffsre), ID($adffe), ID($aldffe), ID($sdffe), ID($sdffce))) {
+ has_ce = true;
+ sig_ce = cell->getPort(ID::EN);
+ pol_ce = cell->getParam(ID::EN_POLARITY).as_bool();
+ }
+ if (cell->type.in(ID($dffsr), ID($dffsre), ID($dlatchsr), ID($sr))) {
+ has_sr = true;
+ sig_clr = cell->getPort(ID::CLR);
+ sig_set = cell->getPort(ID::SET);
+ pol_clr = cell->getParam(ID::CLR_POLARITY).as_bool();
+ pol_set = cell->getParam(ID::SET_POLARITY).as_bool();
+ }
+ if (cell->type.in(ID($aldff), ID($aldffe))) {
+ has_aload = true;
+ sig_aload = cell->getPort(ID::ALOAD);
+ pol_aload = cell->getParam(ID::ALOAD_POLARITY).as_bool();
+ sig_ad = cell->getPort(ID::AD);
+ }
+ if (cell->type.in(ID($adff), ID($adffe), ID($adlatch))) {
+ has_arst = true;
+ sig_arst = cell->getPort(ID::ARST);
+ pol_arst = cell->getParam(ID::ARST_POLARITY).as_bool();
+ val_arst = cell->getParam(ID::ARST_VALUE);
+ }
+ if (cell->type.in(ID($sdff), ID($sdffe), ID($sdffce))) {
+ has_srst = true;
+ sig_srst = cell->getPort(ID::SRST);
+ pol_srst = cell->getParam(ID::SRST_POLARITY).as_bool();
+ val_srst = cell->getParam(ID::SRST_VALUE);
+ ce_over_srst = cell->type == ID($sdffce);
+ }
+ } else if (cell->type == ID($_FF_)) {
+ is_fine = true;
+ has_gclk = true;
+ sig_d = cell->getPort(ID::D);
+ } else if (type_str.substr(0, 5) == "$_SR_") {
+ is_fine = true;
+ has_sr = true;
+ pol_set = type_str[5] == 'P';
+ pol_clr = type_str[6] == 'P';
+ sig_set = cell->getPort(ID::S);
+ sig_clr = cell->getPort(ID::R);
+ } else if (type_str.substr(0, 6) == "$_DFF_" && type_str.size() == 8) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[6] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ } else if (type_str.substr(0, 7) == "$_DFFE_" && type_str.size() == 10) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[7] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_ce = true;
+ pol_ce = type_str[8] == 'P';
+ sig_ce = cell->getPort(ID::E);
+ } else if (type_str.substr(0, 6) == "$_DFF_" && type_str.size() == 10) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[6] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_arst = true;
+ pol_arst = type_str[7] == 'P';
+ sig_arst = cell->getPort(ID::R);
+ val_arst = type_str[8] == '1' ? State::S1 : State::S0;
+ } else if (type_str.substr(0, 7) == "$_DFFE_" && type_str.size() == 12) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[7] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_arst = true;
+ pol_arst = type_str[8] == 'P';
+ sig_arst = cell->getPort(ID::R);
+ val_arst = type_str[9] == '1' ? State::S1 : State::S0;
+ has_ce = true;
+ pol_ce = type_str[10] == 'P';
+ sig_ce = cell->getPort(ID::E);
+ } else if (type_str.substr(0, 8) == "$_ALDFF_" && type_str.size() == 11) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[8] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_aload = true;
+ pol_aload = type_str[9] == 'P';
+ sig_aload = cell->getPort(ID::L);
+ sig_ad = cell->getPort(ID::AD);
+ } else if (type_str.substr(0, 9) == "$_ALDFFE_" && type_str.size() == 13) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[9] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_aload = true;
+ pol_aload = type_str[10] == 'P';
+ sig_aload = cell->getPort(ID::L);
+ sig_ad = cell->getPort(ID::AD);
+ has_ce = true;
+ pol_ce = type_str[11] == 'P';
+ sig_ce = cell->getPort(ID::E);
+ } else if (type_str.substr(0, 8) == "$_DFFSR_" && type_str.size() == 12) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[8] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_sr = true;
+ pol_set = type_str[9] == 'P';
+ pol_clr = type_str[10] == 'P';
+ sig_set = cell->getPort(ID::S);
+ sig_clr = cell->getPort(ID::R);
+ } else if (type_str.substr(0, 9) == "$_DFFSRE_" && type_str.size() == 14) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[9] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_sr = true;
+ pol_set = type_str[10] == 'P';
+ pol_clr = type_str[11] == 'P';
+ sig_set = cell->getPort(ID::S);
+ sig_clr = cell->getPort(ID::R);
+ has_ce = true;
+ pol_ce = type_str[12] == 'P';
+ sig_ce = cell->getPort(ID::E);
+ } else if (type_str.substr(0, 7) == "$_SDFF_" && type_str.size() == 11) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[7] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_srst = true;
+ pol_srst = type_str[8] == 'P';
+ sig_srst = cell->getPort(ID::R);
+ val_srst = type_str[9] == '1' ? State::S1 : State::S0;
+ } else if (type_str.substr(0, 8) == "$_SDFFE_" && type_str.size() == 13) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[8] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_srst = true;
+ pol_srst = type_str[9] == 'P';
+ sig_srst = cell->getPort(ID::R);
+ val_srst = type_str[10] == '1' ? State::S1 : State::S0;
+ has_ce = true;
+ pol_ce = type_str[11] == 'P';
+ sig_ce = cell->getPort(ID::E);
+ } else if (type_str.substr(0, 9) == "$_SDFFCE_" && type_str.size() == 14) {
+ is_fine = true;
+ sig_d = cell->getPort(ID::D);
+ has_clk = true;
+ pol_clk = type_str[9] == 'P';
+ sig_clk = cell->getPort(ID::C);
+ has_srst = true;
+ pol_srst = type_str[10] == 'P';
+ sig_srst = cell->getPort(ID::R);
+ val_srst = type_str[11] == '1' ? State::S1 : State::S0;
+ has_ce = true;
+ pol_ce = type_str[12] == 'P';
+ sig_ce = cell->getPort(ID::E);
+ ce_over_srst = true;
+ } else if (type_str.substr(0, 9) == "$_DLATCH_" && type_str.size() == 11) {
+ is_fine = true;
+ has_aload = true;
+ sig_ad = cell->getPort(ID::D);
+ has_aload = true;
+ pol_aload = type_str[9] == 'P';
+ sig_aload = cell->getPort(ID::E);
+ } else if (type_str.substr(0, 9) == "$_DLATCH_" && type_str.size() == 13) {
+ is_fine = true;
+ has_aload = true;
+ sig_ad = cell->getPort(ID::D);
+ has_aload = true;
+ pol_aload = type_str[9] == 'P';
+ sig_aload = cell->getPort(ID::E);
+ has_arst = true;
+ pol_arst = type_str[10] == 'P';
+ sig_arst = cell->getPort(ID::R);
+ val_arst = type_str[11] == '1' ? State::S1 : State::S0;
+ } else if (type_str.substr(0, 11) == "$_DLATCHSR_" && type_str.size() == 15) {
+ is_fine = true;
+ has_aload = true;
+ sig_ad = cell->getPort(ID::D);
+ has_aload = true;
+ pol_aload = type_str[11] == 'P';
+ sig_aload = cell->getPort(ID::E);
+ has_sr = true;
+ pol_set = type_str[12] == 'P';
+ pol_clr = type_str[13] == 'P';
+ sig_set = cell->getPort(ID::S);
+ sig_clr = cell->getPort(ID::R);
+ } else {
+ log_assert(0);
+ }
+ if (has_aload && !has_clk && !has_sr && !has_arst && sig_ad.is_fully_const()) {
+ // Plain D latches with const D treated specially.
+ has_aload = false;
+ has_arst = true;
+ sig_arst = sig_aload;
+ pol_arst = pol_aload;
+ val_arst = sig_ad.as_const();
+ }
+}
+
+FfData FfData::slice(const std::vector<int> &bits) {
+ FfData res(module, initvals, NEW_ID);
+ res.sig_clk = sig_clk;
+ res.sig_ce = sig_ce;
+ res.sig_aload = sig_aload;
+ res.sig_arst = sig_arst;
+ res.sig_srst = sig_srst;
+ res.has_clk = has_clk;
+ res.has_gclk = has_gclk;
+ res.has_ce = has_ce;
+ res.has_aload = has_aload;
+ res.has_arst = has_arst;
+ res.has_srst = has_srst;
+ res.has_sr = has_sr;
+ res.ce_over_srst = ce_over_srst;
+ res.is_fine = is_fine;
+ res.pol_clk = pol_clk;
+ res.pol_ce = pol_ce;
+ res.pol_aload = pol_aload;
+ res.pol_arst = pol_arst;
+ res.pol_srst = pol_srst;
+ res.pol_clr = pol_clr;
+ res.pol_set = pol_set;
+ res.attributes = attributes;
+ for (int i : bits) {
+ res.sig_q.append(sig_q[i]);
+ if (has_clk || has_gclk)
+ res.sig_d.append(sig_d[i]);
+ if (has_aload)
+ res.sig_ad.append(sig_ad[i]);
+ if (has_sr) {
+ res.sig_clr.append(sig_clr[i]);
+ res.sig_set.append(sig_set[i]);
+ }
+ if (has_arst)
+ res.val_arst.bits.push_back(val_arst[i]);
+ if (has_srst)
+ res.val_srst.bits.push_back(val_srst[i]);
+ if (initvals)
+ res.val_init.bits.push_back(val_init[i]);
+ }
+ res.width = GetSize(res.sig_q);
+ return res;
+}
+
+void FfData::add_dummy_ce() {
+ if (has_ce)
+ return;
+ has_ce = true;
+ pol_ce = true;
+ sig_ce = State::S1;
+ ce_over_srst = false;
+}
+
+void FfData::add_dummy_srst() {
+ if (has_srst)
+ return;
+ has_srst = true;
+ pol_srst = true;
+ sig_srst = State::S0;
+ val_srst = Const(State::Sx, width);
+ ce_over_srst = false;
+}
+
+void FfData::add_dummy_arst() {
+ if (has_arst)
+ return;
+ has_arst = true;
+ pol_arst = true;
+ sig_arst = State::S0;
+ val_arst = Const(State::Sx, width);
+}
+
+void FfData::add_dummy_aload() {
+ if (has_aload)
+ return;
+ has_aload = true;
+ pol_aload = true;
+ sig_aload = State::S0;
+ sig_ad = Const(State::Sx, width);
+}
+
+void FfData::add_dummy_sr() {
+ if (has_sr)
+ return;
+ has_sr = true;
+ pol_clr = true;
+ pol_set = true;
+ sig_clr = Const(State::S0, width);
+ sig_set = Const(State::S0, width);
+}
+
+void FfData::add_dummy_clk() {
+ if (has_clk)
+ return;
+ has_clk = true;
+ pol_clk = true;
+ sig_clk = State::S0;
+ sig_d = Const(State::Sx, width);
+}
+
+void FfData::arst_to_aload() {
+ log_assert(has_arst);
+ log_assert(!has_aload);
+ pol_aload = pol_arst;
+ sig_aload = sig_arst;
+ sig_ad = val_arst;
+ has_aload = true;
+ has_arst = false;
+}
+
+void FfData::arst_to_sr() {
+ log_assert(has_arst);
+ log_assert(!has_sr);
+ pol_clr = pol_arst;
+ pol_set = pol_arst;
+ sig_clr = Const(pol_arst ? State::S0 : State::S1, width);
+ sig_set = Const(pol_arst ? State::S0 : State::S1, width);
+ has_sr = true;
+ has_arst = false;
+ for (int i = 0; i < width; i++) {
+ if (val_arst[i] == State::S1)
+ sig_set[i] = sig_arst;
+ else
+ sig_clr[i] = sig_arst;
+ }
+}
+
+void FfData::aload_to_sr() {
+ log_assert(has_aload);
+ log_assert(!has_sr);
+ has_sr = true;
+ has_aload = false;
+ if (!is_fine) {
+ pol_clr = false;
+ pol_set = true;
+ if (pol_aload) {
+ sig_clr = module->Mux(NEW_ID, Const(State::S1, width), sig_ad, sig_aload);
+ sig_set = module->Mux(NEW_ID, Const(State::S0, width), sig_ad, sig_aload);
+ } else {
+ sig_clr = module->Mux(NEW_ID, sig_ad, Const(State::S1, width), sig_aload);
+ sig_set = module->Mux(NEW_ID, sig_ad, Const(State::S0, width), sig_aload);
+ }
+ } else {
+ pol_clr = pol_aload;
+ pol_set = pol_aload;
+ if (pol_aload) {
+ sig_clr = module->AndnotGate(NEW_ID, sig_aload, sig_ad);
+ sig_set = module->AndGate(NEW_ID, sig_aload, sig_ad);
+ } else {
+ sig_clr = module->OrGate(NEW_ID, sig_aload, sig_ad);
+ sig_set = module->OrnotGate(NEW_ID, sig_aload, sig_ad);
+ }
+ }
+}
+
+void FfData::convert_ce_over_srst(bool val) {
+ if (!has_ce || !has_srst || ce_over_srst == val)
+ return;
+ if (val) {
+ // sdffe to sdffce
+ if (!is_fine) {
+ if (pol_ce) {
+ if (pol_srst) {
+ sig_ce = module->Or(NEW_ID, sig_ce, sig_srst);
+ } else {
+ SigSpec tmp = module->Not(NEW_ID, sig_srst);
+ sig_ce = module->Or(NEW_ID, sig_ce, tmp);
+ }
+ } else {
+ if (pol_srst) {
+ SigSpec tmp = module->Not(NEW_ID, sig_srst);
+ sig_ce = module->And(NEW_ID, sig_ce, tmp);
+ } else {
+ sig_ce = module->And(NEW_ID, sig_ce, sig_srst);
+ }
+ }
+ } else {
+ if (pol_ce) {
+ if (pol_srst) {
+ sig_ce = module->OrGate(NEW_ID, sig_ce, sig_srst);
+ } else {
+ sig_ce = module->OrnotGate(NEW_ID, sig_ce, sig_srst);
+ }
+ } else {
+ if (pol_srst) {
+ sig_ce = module->AndnotGate(NEW_ID, sig_ce, sig_srst);
+ } else {
+ sig_ce = module->AndGate(NEW_ID, sig_ce, sig_srst);
+ }
+ }
+ }
+ } else {
+ // sdffce to sdffe
+ if (!is_fine) {
+ if (pol_srst) {
+ if (pol_ce) {
+ sig_srst = cell->module->And(NEW_ID, sig_srst, sig_ce);
+ } else {
+ SigSpec tmp = module->Not(NEW_ID, sig_ce);
+ sig_srst = cell->module->And(NEW_ID, sig_srst, tmp);
+ }
+ } else {
+ if (pol_ce) {
+ SigSpec tmp = module->Not(NEW_ID, sig_ce);
+ sig_srst = cell->module->Or(NEW_ID, sig_srst, tmp);
+ } else {
+ sig_srst = cell->module->Or(NEW_ID, sig_srst, sig_ce);
+ }
+ }
+ } else {
+ if (pol_srst) {
+ if (pol_ce) {
+ sig_srst = cell->module->AndGate(NEW_ID, sig_srst, sig_ce);
+ } else {
+ sig_srst = cell->module->AndnotGate(NEW_ID, sig_srst, sig_ce);
+ }
+ } else {
+ if (pol_ce) {
+ sig_srst = cell->module->OrnotGate(NEW_ID, sig_srst, sig_ce);
+ } else {
+ sig_srst = cell->module->OrGate(NEW_ID, sig_srst, sig_ce);
+ }
+ }
+ }
+ }
+ ce_over_srst = val;
+}
+
+void FfData::unmap_ce() {
+ if (!has_ce)
+ return;
+ log_assert(has_clk);
+ if (has_srst && ce_over_srst)
+ unmap_srst();
+
+ if (!is_fine) {
+ if (pol_ce)
+ sig_d = module->Mux(NEW_ID, sig_q, sig_d, sig_ce);
+ else
+ sig_d = module->Mux(NEW_ID, sig_d, sig_q, sig_ce);
+ } else {
+ if (pol_ce)
+ sig_d = module->MuxGate(NEW_ID, sig_q, sig_d, sig_ce);
+ else
+ sig_d = module->MuxGate(NEW_ID, sig_d, sig_q, sig_ce);
+ }
+ has_ce = false;
+}
+
+void FfData::unmap_srst() {
+ if (!has_srst)
+ return;
+ if (has_ce && !ce_over_srst)
+ unmap_ce();
+
+ if (!is_fine) {
+ if (pol_srst)
+ sig_d = module->Mux(NEW_ID, sig_d, val_srst, sig_srst);
+ else
+ sig_d = module->Mux(NEW_ID, val_srst, sig_d, sig_srst);
+ } else {
+ if (pol_srst)
+ sig_d = module->MuxGate(NEW_ID, sig_d, val_srst[0], sig_srst);
+ else
+ sig_d = module->MuxGate(NEW_ID, val_srst[0], sig_d, sig_srst);
+ }
+ has_srst = false;
+}
+
+Cell *FfData::emit() {
+ remove();
+ if (!width)
+ return nullptr;
+ if (!has_aload && !has_clk && !has_gclk && !has_sr) {
+ if (has_arst) {
+ // Convert this case to a D latch.
+ arst_to_aload();
+ } else {
+ // No control inputs left. Turn into a const driver.
+ module->connect(sig_q, val_init);
+ return nullptr;
+ }
+ }
+ if (initvals)
+ initvals->set_init(sig_q, val_init);
+ if (!is_fine) {
+ if (has_gclk) {
+ log_assert(!has_clk);
+ log_assert(!has_ce);
+ log_assert(!has_aload);
+ log_assert(!has_arst);
+ log_assert(!has_srst);
+ log_assert(!has_sr);
+ cell = module->addFf(name, sig_d, sig_q);
+ } else if (!has_aload && !has_clk) {
+ log_assert(has_sr);
+ cell = module->addSr(name, sig_set, sig_clr, sig_q, pol_set, pol_clr);
+ } else if (!has_clk) {
+ log_assert(!has_srst);
+ if (has_sr)
+ cell = module->addDlatchsr(name, sig_aload, sig_set, sig_clr, sig_ad, sig_q, pol_aload, pol_set, pol_clr);
+ else if (has_arst)
+ cell = module->addAdlatch(name, sig_aload, sig_arst, sig_ad, sig_q, val_arst, pol_aload, pol_arst);
+ else
+ cell = module->addDlatch(name, sig_aload, sig_ad, sig_q, pol_aload);
+ } else {
+ if (has_sr) {
+ if (has_ce)
+ cell = module->addDffsre(name, sig_clk, sig_ce, sig_set, sig_clr, sig_d, sig_q, pol_clk, pol_ce, pol_set, pol_clr);
+ else
+ cell = module->addDffsr(name, sig_clk, sig_set, sig_clr, sig_d, sig_q, pol_clk, pol_set, pol_clr);
+ } else if (has_arst) {
+ if (has_ce)
+ cell = module->addAdffe(name, sig_clk, sig_ce, sig_arst, sig_d, sig_q, val_arst, pol_clk, pol_ce, pol_arst);
+ else
+ cell = module->addAdff(name, sig_clk, sig_arst, sig_d, sig_q, val_arst, pol_clk, pol_arst);
+ } else if (has_aload) {
+ if (has_ce)
+ cell = module->addAldffe(name, sig_clk, sig_ce, sig_aload, sig_d, sig_q, sig_ad, pol_clk, pol_ce, pol_aload);
+ else
+ cell = module->addAldff(name, sig_clk, sig_aload, sig_d, sig_q, sig_ad, pol_clk, pol_aload);
+ } else if (has_srst) {
+ if (has_ce)
+ if (ce_over_srst)
+ cell = module->addSdffce(name, sig_clk, sig_ce, sig_srst, sig_d, sig_q, val_srst, pol_clk, pol_ce, pol_srst);
+ else
+ cell = module->addSdffe(name, sig_clk, sig_ce, sig_srst, sig_d, sig_q, val_srst, pol_clk, pol_ce, pol_srst);
+ else
+ cell = module->addSdff(name, sig_clk, sig_srst, sig_d, sig_q, val_srst, pol_clk, pol_srst);
+ } else {
+ if (has_ce)
+ cell = module->addDffe(name, sig_clk, sig_ce, sig_d, sig_q, pol_clk, pol_ce);
+ else
+ cell = module->addDff(name, sig_clk, sig_d, sig_q, pol_clk);
+ }
+ }
+ } else {
+ if (has_gclk) {
+ log_assert(!has_clk);
+ log_assert(!has_ce);
+ log_assert(!has_aload);
+ log_assert(!has_arst);
+ log_assert(!has_srst);
+ log_assert(!has_sr);
+ cell = module->addFfGate(name, sig_d, sig_q);
+ } else if (!has_aload && !has_clk) {
+ log_assert(has_sr);
+ cell = module->addSrGate(name, sig_set, sig_clr, sig_q, pol_set, pol_clr);
+ } else if (!has_clk) {
+ log_assert(!has_srst);
+ if (has_sr)
+ cell = module->addDlatchsrGate(name, sig_aload, sig_set, sig_clr, sig_ad, sig_q, pol_aload, pol_set, pol_clr);
+ else if (has_arst)
+ cell = module->addAdlatchGate(name, sig_aload, sig_arst, sig_ad, sig_q, val_arst.as_bool(), pol_aload, pol_arst);
+ else
+ cell = module->addDlatchGate(name, sig_aload, sig_ad, sig_q, pol_aload);
+ } else {
+ if (has_sr) {
+ if (has_ce)
+ cell = module->addDffsreGate(name, sig_clk, sig_ce, sig_set, sig_clr, sig_d, sig_q, pol_clk, pol_ce, pol_set, pol_clr);
+ else
+ cell = module->addDffsrGate(name, sig_clk, sig_set, sig_clr, sig_d, sig_q, pol_clk, pol_set, pol_clr);
+ } else if (has_arst) {
+ if (has_ce)
+ cell = module->addAdffeGate(name, sig_clk, sig_ce, sig_arst, sig_d, sig_q, val_arst.as_bool(), pol_clk, pol_ce, pol_arst);
+ else
+ cell = module->addAdffGate(name, sig_clk, sig_arst, sig_d, sig_q, val_arst.as_bool(), pol_clk, pol_arst);
+ } else if (has_aload) {
+ if (has_ce)
+ cell = module->addAldffeGate(name, sig_clk, sig_ce, sig_aload, sig_d, sig_q, sig_ad, pol_clk, pol_ce, pol_aload);
+ else
+ cell = module->addAldffGate(name, sig_clk, sig_aload, sig_d, sig_q, sig_ad, pol_clk, pol_aload);
+ } else if (has_srst) {
+ if (has_ce)
+ if (ce_over_srst)
+ cell = module->addSdffceGate(name, sig_clk, sig_ce, sig_srst, sig_d, sig_q, val_srst.as_bool(), pol_clk, pol_ce, pol_srst);
+ else
+ cell = module->addSdffeGate(name, sig_clk, sig_ce, sig_srst, sig_d, sig_q, val_srst.as_bool(), pol_clk, pol_ce, pol_srst);
+ else
+ cell = module->addSdffGate(name, sig_clk, sig_srst, sig_d, sig_q, val_srst.as_bool(), pol_clk, pol_srst);
+ } else {
+ if (has_ce)
+ cell = module->addDffeGate(name, sig_clk, sig_ce, sig_d, sig_q, pol_clk, pol_ce);
+ else
+ cell = module->addDffGate(name, sig_clk, sig_d, sig_q, pol_clk);
+ }
+ }
+ }
+ cell->attributes = attributes;
+ return cell;
+}
+
+void FfData::remove() {
+ if (cell) {
+ remove_init();
+ module->remove(cell);
+ cell = nullptr;
+ }
+}
+
+namespace {
+ State invert(State s) {
+ switch (s) {
+ case State::S0: return State::S1;
+ case State::S1: return State::S0;
+ default: return s;
+ }
+ }
+}
+
+void FfData::flip_bits(const pool<int> &bits) {
+ if (!bits.size())
+ return;
+
+ remove_init();
+
+ Wire *new_q = module->addWire(NEW_ID, width);
+
+ for (auto bit: bits) {
+ if (has_arst)
+ val_arst[bit] = invert(val_arst[bit]);
+ if (has_srst)
+ val_srst[bit] = invert(val_srst[bit]);
+ val_init[bit] = invert(val_init[bit]);
+ }
+
+ if (has_sr && cell) {
+ log_warning("Flipping D/Q/init and inserting priority fixup to legalize %s.%s [%s].\n", log_id(module->name), log_id(cell->name), log_id(cell->type));
+ }
+
+ if (is_fine) {
+ if (has_sr) {
+ bool new_pol_clr = pol_set;
+ SigSpec new_sig_clr;
+ if (pol_set) {
+ if (pol_clr) {
+ new_sig_clr = module->AndnotGate(NEW_ID, sig_set, sig_clr);
+ } else {
+ new_sig_clr = module->AndGate(NEW_ID, sig_set, sig_clr);
+ }
+ } else {
+ if (pol_clr) {
+ new_sig_clr = module->OrGate(NEW_ID, sig_set, sig_clr);
+ } else {
+ new_sig_clr = module->OrnotGate(NEW_ID, sig_set, sig_clr);
+ }
+ }
+ pol_set = pol_clr;
+ sig_set = sig_clr;
+ pol_clr = new_pol_clr;
+ sig_clr = new_sig_clr;
+ }
+ if (has_clk || has_gclk)
+ sig_d = module->NotGate(NEW_ID, sig_d);
+ if (has_aload)
+ sig_ad = module->NotGate(NEW_ID, sig_ad);
+ module->addNotGate(NEW_ID, new_q, sig_q);
+ }
+ else
+ {
+ if (has_sr) {
+ SigSpec not_clr;
+ if (!pol_clr) {
+ not_clr = sig_clr;
+ sig_clr = module->Not(NEW_ID, sig_clr);
+ pol_clr = true;
+ } else {
+ not_clr = module->Not(NEW_ID, sig_clr);
+ }
+ if (!pol_set) {
+ sig_set = module->Not(NEW_ID, sig_set);
+ pol_set = true;
+ }
+
+ SigSpec masked_set = module->And(NEW_ID, sig_set, not_clr);
+ for (auto bit: bits) {
+ sig_set[bit] = sig_clr[bit];
+ sig_clr[bit] = masked_set[bit];
+ }
+ }
+
+ Const mask = Const(State::S0, width);
+ for (auto bit: bits)
+ mask.bits[bit] = State::S1;
+
+ if (has_clk || has_gclk)
+ sig_d = module->Xor(NEW_ID, sig_d, mask);
+ if (has_aload)
+ sig_ad = module->Xor(NEW_ID, sig_ad, mask);
+ module->addXor(NEW_ID, new_q, mask, sig_q);
+ }
+
+ sig_q = new_q;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-05 23:59:01 +0000