USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
+struct SimShared
+{
+ bool debug = false;
+ bool hide_internal = true;
+};
+
struct SimInstance
{
+ SimShared *shared;
+
Module *module;
Cell *instance;
dict<SigBit, pool<Wire*>> upd_outports;
pool<SigBit> dirty_bits;
- dict<SigBit, State> next_state_nets;
+ pool<SimInstance*, hash_ptr_ops> dirty_children;
- dict<Wire*, int> vcd_netids;
+ struct ff_state_t
+ {
+ State past_clock;
+ Const past_d;
+ };
+
+ dict<Cell*, ff_state_t> ff_database;
- SimInstance(Module *module, Cell *instance = nullptr, SimInstance *parent = nullptr) :
- module(module), instance(instance), parent(parent), sigmap(module)
+ dict<Wire*, pair<int, Const>> vcd_database;
+
+ SimInstance(SimShared *shared, Module *module, Cell *instance = nullptr, SimInstance *parent = nullptr) :
+ shared(shared), module(module), instance(instance), parent(parent), sigmap(module)
{
if (parent) {
log_assert(parent->children.count(instance) == 0);
Module *mod = module->design->module(cell->type);
if (mod != nullptr) {
- new SimInstance(mod, cell, this);
+ dirty_children.insert(new SimInstance(shared, mod, cell, this));
}
for (auto &port : cell->connections()) {
for (auto bit : sigmap(port.second))
upd_cells[bit].insert(cell);
}
+
+ if (cell->type.in("$dff")) {
+ ff_state_t ff;
+ ff.past_clock = State::Sx;
+ ff.past_d = Const(State::Sx, cell->getParam("\\WIDTH").as_int());
+ ff_database[cell] = ff;
+ }
}
}
+ ~SimInstance()
+ {
+ for (auto child : children)
+ delete child.second;
+ }
+
IdString name() const
{
if (instance != nullptr)
Const value;
for (auto bit : sigmap(sig))
- if (state_nets.count(bit))
+ if (bit.wire == nullptr)
+ value.bits.push_back(bit.data);
+ else if (state_nets.count(bit))
value.bits.push_back(state_nets.at(bit));
else
value.bits.push_back(State::Sz);
- // log("[%s] get %s: %s\n", hiername().c_str(), log_signal(sig), log_signal(value));
+ if (shared->debug)
+ log("[%s] get %s: %s\n", hiername().c_str(), log_signal(sig), log_signal(value));
return value;
}
- void set_state(SigSpec sig, Const value)
+ bool set_state(SigSpec sig, Const value)
{
+ bool did_something = false;
+
sig = sigmap(sig);
log_assert(GetSize(sig) == GetSize(value));
if (state_nets.at(sig[i]) != value[i]) {
state_nets.at(sig[i]) = value[i];
dirty_bits.insert(sig[i]);
+ did_something = true;
}
- // log("[%s] set %s: %s\n", hiername().c_str(), log_signal(sig), log_signal(value));
+ if (shared->debug)
+ log("[%s] set %s: %s\n", hiername().c_str(), log_signal(sig), log_signal(value));
+ return did_something;
}
void update_cell(Cell *cell)
{
+ if (ff_database.count(cell))
+ return;
+
if (children.count(cell))
{
auto child = children.at(cell);
Const value = get_state(conn.second);
child->set_state(child->module->wire(conn.first), value);
}
+ dirty_children.insert(child);
return;
}
if (yosys_celltypes.cell_evaluable(cell->type))
{
- // log("[%s] eval %s (%s)\n", hiername().c_str(), log_id(cell), log_id(cell->type));
-
RTLIL::SigSpec sig_a, sig_b, sig_c, sig_d, sig_s, sig_y;
bool has_a, has_b, has_c, has_d, has_s, has_y;
if (has_s) sig_s = cell->getPort("\\S");
if (has_y) sig_y = cell->getPort("\\Y");
+ if (shared->debug)
+ log("[%s] eval %s (%s)\n", hiername().c_str(), log_id(cell), log_id(cell->type));
+
// Simple (A -> Y) and (A,B -> Y) cells
if (has_a && !has_c && !has_d && !has_s && has_y) {
set_state(sig_y, CellTypes::eval(cell, get_state(sig_a), get_state(sig_b)));
log_warning("Unsupported cell type: %s (%s.%s)\n", log_id(cell->type), log_id(module), log_id(cell));
}
- void update()
+ void update_ph1()
{
+ pool<Cell*> queue_cells;
+ pool<Wire*> queue_outports;
+
while (1)
{
- while (!dirty_bits.empty())
+ for (auto bit : dirty_bits)
{
- SigBit bit = *dirty_bits.begin();
- dirty_bits.erase(bit);
-
if (upd_cells.count(bit))
- {
for (auto cell : upd_cells.at(bit))
- update_cell(cell);
- }
+ queue_cells.insert(cell);
if (upd_outports.count(bit) && parent != nullptr)
- {
for (auto wire : upd_outports.at(bit))
- if (instance->hasPort(wire->name)) {
- Const value = get_state(wire);
- parent->set_state(instance->getPort(wire->name), value);
- }
- }
+ queue_outports.insert(wire);
}
- for (auto child : children)
- child.second->update();
+ dirty_bits.clear();
+
+ if (!queue_cells.empty())
+ {
+ for (auto cell : queue_cells)
+ update_cell(cell);
+
+ queue_cells.clear();
+ continue;
+ }
+
+ for (auto wire : queue_outports)
+ if (instance->hasPort(wire->name)) {
+ Const value = get_state(wire);
+ parent->set_state(instance->getPort(wire->name), value);
+ }
+
+ queue_outports.clear();
+
+ for (auto child : dirty_children)
+ child->update_ph1();
+
+ dirty_children.clear();
if (dirty_bits.empty())
break;
}
}
+ bool update_ph2()
+ {
+ bool did_something = false;
+
+ for (auto &it : ff_database)
+ {
+ Cell *cell = it.first;
+ ff_state_t &ff = it.second;
+
+ if (cell->type.in("$dff"))
+ {
+ bool clkpol = cell->getParam("\\CLK_POLARITY").as_bool();
+ State current_clock = get_state(cell->getPort("\\CLK"))[0];
+
+ if (clkpol ? (ff.past_clock == State::S1 || current_clock != State::S1) :
+ (ff.past_clock == State::S0 || current_clock != State::S0))
+ continue;
+
+ if (set_state(cell->getPort("\\Q"), ff.past_d))
+ did_something = true;
+ }
+ }
+
+ for (auto it : children)
+ if (it.second->update_ph2()) {
+ dirty_children.insert(it.second);
+ did_something = true;
+ }
+
+ return did_something;
+ }
+
+ void update_ph3()
+ {
+ for (auto &it : ff_database)
+ {
+ Cell *cell = it.first;
+ ff_state_t &ff = it.second;
+
+ if (cell->type.in("$dff")) {
+ ff.past_clock = get_state(cell->getPort("\\CLK"))[0];
+ ff.past_d = get_state(cell->getPort("\\D"));
+ }
+ }
+
+ for (auto it : children)
+ it.second->update_ph3();
+ }
+
void write_vcd_header(std::ofstream &f, int &id)
{
f << stringf("$scope module %s $end\n", log_id(name()));
for (auto wire : module->wires())
{
- if (wire->name[0] == '$')
+ if (shared->hide_internal && wire->name[0] == '$')
continue;
- f << stringf("$var wire %d n%d %s $end\n", GetSize(wire), id, log_id(wire));
- vcd_netids[wire] = id++;
+ f << stringf("$var wire %d n%d %s%s $end\n", GetSize(wire), id, wire->name[0] == '$' ? "\\" : "", log_id(wire));
+ vcd_database[wire] = make_pair(id++, Const());
}
for (auto child : children)
void write_vcd_step(std::ofstream &f)
{
- for (auto it : vcd_netids)
+ for (auto &it : vcd_database)
{
Wire *wire = it.first;
Const value = get_state(wire);
- int id = it.second;
+ int id = it.second.first;
+
+ if (it.second.second == value)
+ continue;
+
+ it.second.second = value;
f << "b";
for (int i = GetSize(value)-1; i >= 0; i--) {
}
};
-struct SimWorker
+struct SimWorker : SimShared
{
SimInstance *top = nullptr;
std::ofstream vcdfile;
+ pool<IdString> clock, clockn, reset, resetn;
- void initialize(Module *topmod)
+ ~SimWorker()
{
- top = new SimInstance(topmod);
- top->update();
- }
-
- void step()
- {
- // FIXME
+ delete top;
}
void write_vcd_header()
vcdfile << stringf("$enddefinitions $end\n");
}
- void write_vcd_step(int n)
+ void write_vcd_step(int t)
{
if (!vcdfile.is_open())
return;
- vcdfile << stringf("#%d\n", 10*n);
+ vcdfile << stringf("#%d\n", t);
top->write_vcd_step(vcdfile);
}
+
+ void update()
+ {
+ do
+ {
+ if (debug)
+ log("\n-- ph1 --\n");
+
+ top->update_ph1();
+
+ if (debug)
+ log("\n-- ph2 --\n");
+ }
+ while (top->update_ph2());
+
+ if (debug)
+ log("\n-- ph3 --\n");
+
+ top->update_ph3();
+ }
+
+ void set_inports(pool<IdString> ports, State value)
+ {
+ for (auto portname : ports)
+ {
+ Wire *w = top->module->wire(portname);
+
+ if (w == nullptr)
+ log_error("Can't find port %s on module %s.\n", log_id(portname), log_id(top->module));
+
+ top->set_state(w, value);
+ }
+ }
+
+ void run(Module *topmod, int numcycles)
+ {
+ log_assert(top == nullptr);
+ top = new SimInstance(this, topmod);
+
+ if (debug)
+ log("\n===== 0 =====\n");
+
+ set_inports(reset, State::S1);
+ set_inports(resetn, State::S0);
+
+ update();
+
+ write_vcd_header();
+ write_vcd_step(0);
+
+ for (int cycle = 0; cycle < numcycles; cycle++)
+ {
+ if (debug)
+ log("\n===== %d =====\n", 10*cycle + 5);
+
+ set_inports(clock, State::S0);
+ set_inports(clockn, State::S1);
+
+ update();
+ write_vcd_step(10*cycle + 5);
+
+ if (debug)
+ log("\n===== %d =====\n", 10*cycle + 10);
+
+ set_inports(clock, State::S1);
+ set_inports(clockn, State::S0);
+
+ if (cycle == 0) {
+ set_inports(reset, State::S0);
+ set_inports(resetn, State::S1);
+ }
+
+ update();
+ write_vcd_step(10*cycle + 10);
+ }
+
+ write_vcd_step(10*numcycles + 2);
+ }
};
struct SimPass : public Pass {
log(" -vcd <filename>\n");
log(" write the simulation results to the given VCD file\n");
log("\n");
+ log(" -clock <portname>\n");
+ log(" name of top-level clock input\n");
+ log("\n");
+ log(" -clockn <portname>\n");
+ log(" name of top-level clock input (inverse polarity)\n");
+ log("\n");
+ log(" -reset <portname>\n");
+ log(" name of top-level reset input (active high)\n");
+ log("\n");
+ log(" -resetn <portname>\n");
+ log(" name of top-level inverted reset input (active low)\n");
+ log("\n");
log(" -n <integer>\n");
- log(" number of steps to simulate (default: 20)\n");
+ log(" number of cycles to simulate (default: 20)\n");
+ log("\n");
+ log(" -a\n");
+ log(" include all nets in VCD output, nut just those with public names\n");
+ log("\n");
+ log(" -d\n");
+ log(" enable debug output\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
SimWorker worker;
- int numsteps = 20;
+ int numcycles = 20;
log_header(design, "Executing SIM pass (simulate the circuit).\n");
continue;
}
if (args[argidx] == "-n" && argidx+1 < args.size()) {
- numsteps = atoi(args[++argidx].c_str());
+ numcycles = atoi(args[++argidx].c_str());
+ continue;
+ }
+ if (args[argidx] == "-clock" && argidx+1 < args.size()) {
+ worker.clock.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-clockn" && argidx+1 < args.size()) {
+ worker.clockn.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-reset" && argidx+1 < args.size()) {
+ worker.reset.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-resetn" && argidx+1 < args.size()) {
+ worker.resetn.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-a") {
+ worker.hide_internal = false;
+ continue;
+ }
+ if (args[argidx] == "-d") {
+ worker.debug = true;
continue;
}
break;
top_mod = mods.front();
}
- worker.initialize(top_mod);
- worker.write_vcd_header();
- worker.write_vcd_step(0);
-
- for (int i = 1; i < numsteps; i++) {
- worker.step();
- worker.write_vcd_step(i);
- }
+ worker.run(top_mod, numcycles);
}
} SimPass;
projects / yosys.git / commitdiff