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Try using an ICE40_CARRY_LUT primitive to avoid ABC issues

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This commit is contained in:
Eddie Hung 2019-04-17 11:10:04 -07:00
parent d59185f1d6
commit a7632ab332
7 changed files with 102 additions and 35 deletions
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2
techlibs/ice40/synth_ice40.cc
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@ -296,7 +296,7 @@ struct SynthIce40Pass : public ScriptPass
run("opt_merge");
run(stringf("dff2dffe -unmap-mince %d", min_ce_use));
}
run("techmap -D NO_LUT -map +/ice40/cells_map.v");
run("techmap -D NO_LUT -D NO_CARRY -map +/ice40/cells_map.v");
run("opt_expr -mux_undef");
run("simplemap");
run("ice40_ffinit");