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ice40_wrapcarry to really preserve attributes via -unwrap option

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This commit is contained in:
Eddie Hung 2019-12-09 11:48:28 -08:00
parent 946d5854c0
commit e05372778a
4 changed files with 61 additions and 39 deletions
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19
techlibs/ice40/cells_map.v
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@ -61,22 +61,3 @@ module \$lut (A, Y);
endgenerate
endmodule
`endif
`ifndef NO_ADDER
module \$__ICE40_CARRY_WRAPPER (output CO, O, input A, B, CI, I0, I3);
parameter LUT = 0;
SB_CARRY _TECHMAP_REPLACE_ (
.I0(A),
.I1(B),
.CI(CI),
.CO(CO)
);
\$lut #(
.WIDTH(4),
.LUT(LUT)
) lut (
.A({I0,A,B,I3}),
.Y(O)
);
endmodule
`endif

1
techlibs/ice40/synth_ice40.cc
View file

@ -363,6 +363,7 @@ struct SynthIce40Pass : public ScriptPass
else
run(abc + " -dress -lut 4", "(skip if -noabc)");
}
run("ice40_wrapcarry -unwrap");
run("techmap -D NO_LUT -map +/ice40/cells_map.v");
run("clean");
run("opt_lut -dlogic SB_CARRY:I0=2:I1=1:CI=0");