// - empty set [not a cell — will be emitted as a simple direct connection]
struct FfData {
+ Module *module;
FfInitVals *initvals;
+ Cell *cell;
+ IdString name;
// The FF output.
SigSpec sig_q;
// The sync data input, present if has_clk or has_gclk.
int width;
dict<IdString, Const> attributes;
- FfData(FfInitVals *initvals = nullptr, Cell *cell = nullptr) : initvals(initvals) {
+ FfData(Module *module = nullptr, FfInitVals *initvals = nullptr, IdString name = IdString()) : module(module), initvals(initvals), cell(nullptr), name(name) {
width = 0;
has_clk = false;
has_gclk = false;
pol_srst = false;
pol_clr = false;
pol_set = false;
+ }
- if (!cell)
- return;
+ FfData(FfInitVals *initvals, Cell *cell_);
- sig_q = cell->getPort(ID::Q);
- width = GetSize(sig_q);
- attributes = cell->attributes;
+ // Returns a FF identical to this one, but only keeping bit indices from the argument.
+ FfData slice(const std::vector<int> &bits);
- if (initvals)
- val_init = (*initvals)(sig_q);
+ void add_dummy_ce();
+ void add_dummy_srst();
+ void add_dummy_arst();
+ void add_dummy_aload();
+ void add_dummy_sr();
+ void add_dummy_clk();
- std::string type_str = cell->type.str();
+ void arst_to_aload();
+ void arst_to_sr();
- 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();
- }
- }
+ void aload_to_sr();
- // Returns a FF identical to this one, but only keeping bit indices from the argument.
- FfData slice(const std::vector<int> &bits) {
- FfData res(initvals);
- 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;
- }
+ // Given a FF with both has_ce and has_srst, sets ce_over_srst to the given value and
+ // fixes up control signals appropriately to preserve semantics.
+ void convert_ce_over_srst(bool val);
- void unmap_ce(Module *module) {
- if (!has_ce)
- return;
- log_assert(has_clk);
- if (has_srst && ce_over_srst)
- unmap_srst(module);
+ void unmap_ce();
+ void 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 unmap_ce_srst() {
+ unmap_ce();
+ unmap_srst();
}
- void unmap_srst(Module *module) {
- if (!has_srst)
- return;
- if (has_ce && !ce_over_srst)
- unmap_ce(module);
+ Cell *emit();
- 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;
+ // Removes init attribute from the Q output, but keeps val_init unchanged.
+ // It will be automatically reattached on emit. Use this before changing sig_q.
+ void remove_init() {
+ if (initvals)
+ initvals->remove_init(sig_q);
}
- void unmap_ce_srst(Module *module) {
- unmap_ce(module);
- unmap_srst(module);
- }
+ void remove();
- Cell *emit(Module *module, IdString name) {
- if (!width)
- return nullptr;
- if (!has_aload && !has_clk && !has_gclk && !has_sr) {
- if (has_arst) {
- // Convert this case to a D latch.
- has_aload = true;
- has_arst = false;
- sig_ad = val_arst;
- sig_aload = sig_arst;
- pol_aload = pol_arst;
- } else {
- // No control inputs left. Turn into a const driver.
- if (initvals)
- initvals->remove_init(sig_q);
- module->connect(sig_q, val_init);
- return nullptr;
- }
- }
- if (initvals)
- initvals->set_init(sig_q, val_init);
- Cell *cell;
- 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;
- }
+ // Flip the sense of the given bit slices of the FF: insert inverters on data
+ // inputs and output, flip the corresponding init/reset bits, swap clr/set
+ // inputs with proper priority fix.
+ void flip_bits(const pool<int> &bits);
};
YOSYS_NAMESPACE_END
projects / yosys.git / blobdiff