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Made NX_CY model more robust

This commit is contained in:
Miodrag Milanovic 2024-04-22 14:06:03 +02:00
parent dac4f04460
commit 1591d258a9
1 changed files with 9 additions and 1 deletions
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10
techlibs/nanoxplore/cells_sim.v
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@ -40,7 +40,15 @@ endmodule
module NX_CY(input A1, A2, A3, A4, B1, B2, B3, B4, (* abc9_carry *) input CI, output S1, S2, S3, S4, (* abc9_carry *) output CO);
parameter add_carry = 0;
assign {CO, S4, S3, S2, S1} = {A4, A3, A2, A1} + {B4, B3, B2, B1} + CI;
wire CI_1;
wire CO1, CO2, CO3;
assign CI_1 = (add_carry==2) ? CI : ((add_carry==1) ? 1'b1 : 1'b0);
assign { CO1, S1 } = A1 + B1 + CI_1;
assign { CO2, S2 } = A2 + B2 + CO1;
assign { CO3, S3 } = A3 + B3 + CO2;
assign { CO, S4 } = A4 + B4 + CO3;
endmodule