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Add shregmap -init_msb_first and use in synth_xilinx

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This commit is contained in:
Eddie Hung 2019-03-14 08:10:02 -07:00
parent 79b4a275ce
commit 26ecbc1aee
2 changed files with 16 additions and 4 deletions
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16
passes/techmap/shregmap.cc
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@ -34,7 +34,7 @@ struct ShregmapOptions
{
int minlen, maxlen;
int keep_before, keep_after;
bool zinit, init, params, ffe;
bool zinit, init, params, ffe, init_msb_first;
dict<IdString, pair<IdString, IdString>> ffcells;
ShregmapTech *tech;
@ -48,6 +48,7 @@ struct ShregmapOptions
init = false;
params = false;
ffe = false;
init_msb_first = false;
tech = nullptr;
}
};
@ -307,6 +308,8 @@ struct ShregmapWorker
initval.push_back(State::S0);
remove_init.insert(bit);
}
if (opts.init_msb_first)
std::reverse(initval.begin(), initval.end());
first_cell->setParam("\\INIT", initval);
}
@ -442,9 +445,13 @@ struct ShregmapPass : public Pass {
log("\n");
log(" -init\n");
log(" map initialized registers to the shift reg, add an INIT parameter to\n");
log(" generated cells with the initialization value. (first bit to shift out\n");
log(" generated cells with the initialization value. (First bit to shift out\n");
log(" in LSB position)\n");
log("\n");
log(" -init_msb_first\n");
log(" same as -init, but INIT parameter to have first bit to shift out\n");
log(" in MSB position.\n");
log("\n");
log(" -tech greenpak4\n");
log(" map to greenpak4 shift registers.\n");
log("\n");
@ -515,6 +522,11 @@ struct ShregmapPass : public Pass {
opts.init = true;
continue;
}
if (args[argidx] == "-init_msb_first") {
opts.init = true;
opts.init_msb_first = true;
continue;
}
if (args[argidx] == "-params") {
opts.params = true;
continue;