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memory_bram: create blackboxes

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This commit is contained in:
Emil J. Tywoniak 2026-04-16 16:58:48 +02:00
parent 19a4c29a0e
commit 1dc7a69d7f
1 changed files with 63 additions and 0 deletions
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63
passes/memory/memory_bram.cc
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@ -125,6 +125,55 @@ struct rules_t
variant_params[stringf("\\CFG_CLKPOL_%c", 'A' + i)] = clkpol[i];
}
}
void load_blackbox(Design* design) const
{
auto portinfos = make_portinfos();
int clocks_max = 0;
for (auto &pi : portinfos)
clocks_max = max(clocks_max, pi.clocks);
pool<std::pair<IdString, int>> inputs;
pool<std::pair<IdString, int>> outputs;
for (auto &pi : portinfos)
{
string prefix = stringf("%c%d", pi.group + 'A', pi.index + 1);
const char *pf = prefix.c_str();
if (pi.clocks) {
std::string name = stringf("\\CLK%d", (pi.clocks-1) % clocks_max + 1);
inputs.insert(std::make_pair(name, 1));
}
inputs.insert(std::make_pair(stringf("\\%sADDR", pf), abits));
std::string dname = stringf("\\%sDATA", pf);
if (pi.wrmode) {
inputs.insert(std::make_pair(dname, dbits));
} else {
outputs.insert(std::make_pair(dname, dbits));
}
if (pi.enable) {
std::string name = stringf("\\%sEN", pf);
inputs.insert(std::make_pair(name, 1));
}
}
log_debug("setting up %s\n", name);
Module* mod = design->addModule(name);
mod->set_bool_attribute(ID::blackbox);
for (auto [name, width] : inputs)
{
log_debug("input %s width %d\n", name, width);
mod->addWire(name, width)->port_input = true;
}
for (auto [name, width] : outputs)
{
log_debug("output %s width %d\n", name, width);
mod->addWire(name, width)->port_output = true;
}
mod->fixup_ports();
}
};
struct match_t {
@ -160,6 +209,19 @@ struct rules_t
vector<string> labels;
int linecount;
void load_blackboxes(Design* design) const
{
for (auto& [_, variants] : brams)
{
for (const bram_t& bram : variants)
{
if (design->module(bram.name))
continue;
bram.load_blackbox(design);
}
}
}
void syntax_error()
{
if (tokens.empty())
@ -1314,6 +1376,7 @@ struct MemoryBramPass : public Pass {
for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-rules" && argidx+1 < args.size()) {
rules.parse(args[++argidx]);
rules.load_blackboxes(design);
continue;
}
break;