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| author | Eddie Hung <eddie@fpgeh.com> | 2020-01-24 11:59:48 -0800 |
|---|---|---|
| committer | Eddie Hung <eddie@fpgeh.com> | 2020-01-24 11:59:48 -0800 |
| commit | b1787615514f84c83c27d08011427e90c9bd0f4a (patch) | |
| tree | 9e9e7ac93681070e550c0cc19bd36da6f6729b71 /techlibs/ice40/arith_map.v | |
| parent | da6abc014987ef562a577dc374bcb03aad9256cd (diff) | |
| download | yosys-b1787615514f84c83c27d08011427e90c9bd0f4a.tar.gz yosys-b1787615514f84c83c27d08011427e90c9bd0f4a.tar.bz2 yosys-b1787615514f84c83c27d08011427e90c9bd0f4a.zip | |
ice40: reduce ABC9 internal fanout warnings with a param for CI->I3
Diffstat (limited to 'techlibs/ice40/arith_map.v')
| -rw-r--r-- | techlibs/ice40/arith_map.v | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/techlibs/ice40/arith_map.v b/techlibs/ice40/arith_map.v index 00a07247b..ed4140e44 100644 --- a/techlibs/ice40/arith_map.v +++ b/techlibs/ice40/arith_map.v @@ -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]) ); |