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Added -buf, -true and -false options to blif backend

This commit is contained in:
Clifford Wolf 2013-10-17 21:37:18 +02:00
parent 95dbacefbf
commit 30b0de006f
1 changed files with 40 additions and 2 deletions
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38
backends/blif/blif.cc
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@ -35,6 +35,9 @@ struct BlifDumperConfig
bool conn_mode;
bool impltf_mode;
std::string buf_type, buf_in, buf_out;
std::string true_type, true_out, false_type, false_out;
BlifDumperConfig() : subckt_mode(false), conn_mode(false), impltf_mode(false) { }
};
@ -115,7 +118,13 @@ struct BlifDumper
fprintf(f, "\n");
if (!config->impltf_mode) {
if (!config->false_type.empty())
fprintf(f, ".subckt %s %s=$false\n", config->false_type.c_str(), config->false_out.c_str());
else
fprintf(f, ".names $false\n");
if (!config->true_type.empty())
fprintf(f, ".subckt %s %s=$true\n", config->true_type.c_str(), config->true_out.c_str());
else
fprintf(f, ".names $true\n1\n");
}
@ -182,9 +191,13 @@ struct BlifDumper
for (int i = 0; i < conn.first.width; i++)
if (config->conn_mode)
fprintf(f, ".conn %s %s\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
else if (!config->buf_type.empty())
fprintf(f, ".subckt %s %s=%s %s=%s\n", config->buf_type.c_str(), config->buf_in.c_str(), cstr(conn.second.extract(i, 1)),
config->buf_out.c_str(), cstr(conn.first.extract(i, 1)));
else
fprintf(f, ".names %s %s\n1 1\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
fprintf(f, ".end\n");
}
@ -208,6 +221,12 @@ struct BlifBackend : public Backend {
log(" -top top_module\n");
log(" set the specified module as design top module\n");
log("\n");
log(" -buf <cell-type> <in-port> <out-port>\n");
log(" use cells of type <cell-type> with the specified port names for buffers\n");
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("\n");
log("The following options can be usefull 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");
@ -228,6 +247,9 @@ struct BlifBackend : public Backend {
virtual void execute(FILE *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
{
std::string top_module_name;
std::string buf_type, buf_in, buf_out;
std::string true_type, true_out;
std::string false_type, false_out;
BlifDumperConfig config;
log_header("Executing BLIF backend.\n");
@ -239,6 +261,22 @@ struct BlifBackend : public Backend {
top_module_name = args[++argidx];
continue;
}
if (args[argidx] == "-buf" && argidx+3 < args.size()) {
config.buf_type = args[++argidx];
config.buf_in = args[++argidx];
config.buf_out = args[++argidx];
continue;
}
if (args[argidx] == "-true" && argidx+2 < args.size()) {
config.true_type = args[++argidx];
config.true_out = args[++argidx];
continue;
}
if (args[argidx] == "-false" && argidx+2 < args.size()) {
config.false_type = args[++argidx];
config.false_out = args[++argidx];
continue;
}
if (args[argidx] == "-subckt") {
config.subckt_mode = true;
continue;