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Revert "Merge pull request #1280 from YosysHQ/revert-1266-eddie/ice40_full_adder"

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This reverts commit c851dc1310, reversing
changes made to f54bf1631f.
This commit is contained in:
Eddie Hung 2019-08-12 12:06:45 -07:00
parent 78b30bbb11
commit 12c692f6ed
20 changed files with 181 additions and 181 deletions
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23
techlibs/ice40/cells_map.v
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@ -62,26 +62,21 @@ module \$lut (A, Y);
endmodule
`endif
`ifdef _ABC
module \$__ICE40_FULL_ADDER (output CO, O, input A, B, CI);
`ifndef NO_ADDER
module \$__ICE40_CARRY_WRAPPER (output CO, O, input A, B, CI, I0, I3);
parameter LUT = 0;
SB_CARRY carry (
.I0(A),
.I1(B),
.CI(CI),
.CO(CO)
);
SB_LUT4 #(
// I0: 1010 1010 1010 1010
// I1: 1100 1100 1100 1100
// I2: 1111 0000 1111 0000
// I3: 1111 1111 0000 0000
.LUT_INIT(16'b 0110_1001_1001_0110)
) adder (
.I0(1'b0),
.I1(A),
.I2(B),
.I3(CI),
.O(O)
\$lut #(
.WIDTH(4),
.LUT(LUT)
) lut (
.A({I3,B,A,I0}),
.Y(O)
);
endmodule
`endif