diff options
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/blif/blif.cc | 46 |
1 files changed, 33 insertions, 13 deletions
diff --git a/backends/blif/blif.cc b/backends/blif/blif.cc index fa5f7bca2..aaf85f460 100644 --- a/backends/blif/blif.cc +++ b/backends/blif/blif.cc @@ -42,7 +42,7 @@ struct BlifDumperConfig std::string buf_type, buf_in, buf_out; std::map<RTLIL::IdString, std::pair<RTLIL::IdString, RTLIL::IdString>> unbuf_types; - std::string true_type, true_out, false_type, false_out; + std::string true_type, true_out, false_type, false_out, undef_type, undef_out; BlifDumperConfig() : icells_mode(false), conn_mode(false), impltf_mode(false), gates_mode(false), param_mode(false), blackbox_mode(false) { } }; @@ -74,8 +74,11 @@ struct BlifDumper const char *cstr(RTLIL::SigBit sig) { - if (sig.wire == NULL) - return sig == RTLIL::State::S1 ? "$true" : "$false"; + if (sig.wire == NULL) { + if (sig == RTLIL::State::S0) return config->false_type == "-" ? config->false_out.c_str() : "$false"; + if (sig == RTLIL::State::S1) return config->true_type == "-" ? config->true_out.c_str() : "$true"; + return config->undef_type == "-" ? config->undef_out.c_str() : "$undef"; + } std::string str = RTLIL::unescape_id(sig.wire->name); for (size_t i = 0; i < str.size(); i++) @@ -138,16 +141,24 @@ struct BlifDumper } if (!config->impltf_mode) { - if (!config->false_type.empty()) - f << stringf(".%s %s %s=$false\n", subckt_or_gate(config->false_type), - config->false_type.c_str(), config->false_out.c_str()); - else + if (!config->false_type.empty()) { + if (config->false_type != "-") + f << stringf(".%s %s %s=$false\n", subckt_or_gate(config->false_type), + config->false_type.c_str(), config->false_out.c_str()); + } else f << stringf(".names $false\n"); - if (!config->true_type.empty()) - f << stringf(".%s %s %s=$true\n", subckt_or_gate(config->true_type), - config->true_type.c_str(), config->true_out.c_str()); - else + if (!config->true_type.empty()) { + if (config->true_type != "-") + f << stringf(".%s %s %s=$true\n", subckt_or_gate(config->true_type), + config->true_type.c_str(), config->true_out.c_str()); + } else f << stringf(".names $true\n1\n"); + if (!config->undef_type.empty()) { + if (config->undef_type != "-") + f << stringf(".%s %s %s=$undef\n", subckt_or_gate(config->undef_type), + config->undef_type.c_str(), config->undef_out.c_str()); + } else + f << stringf(".names $undef\n"); } for (auto &cell_it : module->cells_) @@ -300,7 +311,11 @@ struct BlifBackend : public Backend { log("\n"); log(" -true <cell-type> <out-port>\n"); log(" -false <cell-type> <out-port>\n"); - log(" use the specified cell types to drive nets that are constant 1 or 0\n"); + log(" -undef <cell-type> <out-port>\n"); + log(" use the specified cell types to drive nets that are constant 1, 0, or\n"); + log(" undefined. when '-' is used as <cell-type>, then <out-port> specifies\n"); + log(" the wire name to be used for the constant signal and no cell driving\n"); + log(" that wire is generated.\n"); log("\n"); log("The following options can be useful when the generated file is not going to be\n"); log("read by a BLIF parser but a custom tool. It is recommended to not name the output\n"); @@ -325,7 +340,7 @@ struct BlifBackend : public Backend { log(" write blackbox cells with .blackbox statement.\n"); log("\n"); log(" -impltf\n"); - log(" do not write definitions for the $true and $false wires.\n"); + log(" do not write definitions for the $true, $false and $undef wires.\n"); log("\n"); } virtual void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) @@ -368,6 +383,11 @@ struct BlifBackend : public Backend { config.false_out = args[++argidx]; continue; } + if (args[argidx] == "-undef" && argidx+2 < args.size()) { + config.undef_type = args[++argidx]; + config.undef_out = args[++argidx]; + continue; + } if (args[argidx] == "-icells") { config.icells_mode = true; continue; |