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nexus: Add LRAM inference

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-12-07 13:27:17 +00:00
parent 264e924abb
commit 17812a1560
5 changed files with 227 additions and 1 deletions
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19
techlibs/nexus/synth_nexus.cc
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@ -77,6 +77,11 @@ struct SynthNexusPass : public ScriptPass
log(" -nodffe\n");
log(" do not use flipflops with CE in output netlist\n");
log("\n");
log(" -nolram\n");
log(" do not use large RAM cells in output netlist\n");
log(" note that large RAM must be explicitly requested with a (* lram *)\n");
log(" attribute on the memory.\n");
log("\n");
log(" -nobram\n");
log(" do not use block RAM cells in output netlist\n");
log("\n");
@ -101,7 +106,7 @@ struct SynthNexusPass : public ScriptPass
}
string top_opt, json_file, vm_file, family;
bool noccu2, nodffe, nobram, nolutram, nowidelut, noiopad, nodsp, flatten, dff, retime, abc9;
bool noccu2, nodffe, nolram, nobram, nolutram, nowidelut, noiopad, nodsp, flatten, dff, retime, abc9;
void clear_flags() override
{
@ -111,6 +116,7 @@ struct SynthNexusPass : public ScriptPass
vm_file = "";
noccu2 = false;
nodffe = false;
nolram = false;
nobram = false;
nolutram = false;
nowidelut = false;
@ -181,6 +187,10 @@ struct SynthNexusPass : public ScriptPass
nodffe = true;
continue;
}
if (args[argidx] == "-nolram") {
nolram = true;
continue;
}
if (args[argidx] == "-nobram") {
nobram = true;
continue;
@ -286,6 +296,13 @@ struct SynthNexusPass : public ScriptPass
run("opt_clean");
}
if (!nolram && check_label("map_lram", "(skip if -nolram)"))
{
run("memory_bram -rules +/nexus/lrams.txt");
run("setundef -zero -params t:$__NX_PDPSC512K");
run("techmap -map +/nexus/lrams_map.v");
}
if (!nobram && check_label("map_bram", "(skip if -nobram)"))
{
run("memory_bram -rules +/nexus/brams.txt");