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synth_sf2: add -discard-ffinit option to discard ff initial value 

sf2 ff have no initial values, but some IP cores use initial values.
In order to use those cores on sf2, it is required to discard the
initial value (to be carefully used).
This commit is contained in:
Tristan Gingold 2021-11-18 08:43:20 +01:00
parent 7117817dbe
commit 4543751a77
1 changed files with 11 additions and 1 deletions
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12
techlibs/sf2/synth_sf2.cc
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@ -66,6 +66,9 @@ struct SynthSf2Pass : public ScriptPass
log(" -clkbuf\n");
log(" insert direct PAD->global_net buffers\n");
log("\n");
log(" -discard-ffinit\n");
log(" discard FF init value instead of emitting an error\n");
log("\n");
log(" -retime\n");
log(" run 'abc' with '-dff -D 1' options\n");
log("\n");
@ -76,7 +79,7 @@ struct SynthSf2Pass : public ScriptPass
}
string top_opt, edif_file, vlog_file, json_file;
bool flatten, retime, iobs, clkbuf;
bool flatten, retime, iobs, clkbuf, discard_ffinit;
void clear_flags() override
{
@ -88,6 +91,7 @@ struct SynthSf2Pass : public ScriptPass
retime = false;
iobs = true;
clkbuf = false;
discard_ffinit = false;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -138,6 +142,10 @@ struct SynthSf2Pass : public ScriptPass
clkbuf = true;
continue;
}
if (args[argidx] == "-discard-ffinit") {
discard_ffinit = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -171,6 +179,8 @@ struct SynthSf2Pass : public ScriptPass
if (check_label("coarse"))
{
if (discard_ffinit || help_mode)
run("attrmap -remove init", "(only if -discard-ffinit)");
run("synth -run coarse");
}