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ice40: reduce ABC9 internal fanout warnings with a param for CI->I3

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This commit is contained in:
Eddie Hung 2020-01-24 11:59:48 -08:00
parent da6abc0149
commit b178761551
6 changed files with 26 additions and 32 deletions
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5
techlibs/ice40/arith_map.v
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@ -49,13 +49,14 @@ module _80_ice40_alu (A, B, CI, BI, X, Y, CO);
// A[1]: 1100 1100 1100 1100
// A[2]: 1111 0000 1111 0000
// A[3]: 1111 1111 0000 0000
.LUT(16'b 0110_1001_1001_0110)
.LUT(16'b 0110_1001_1001_0110),
.I3_IS_CI(1'b1)
) carry (
.A(AA[i]),
.B(BB[i]),
.CI(C[i]),
.I0(1'b0),
.I3(C[i]),
.I3(1'bx),
.CO(CO[i]),
.O(Y[i])
);