parameter A_WIDTH = 1;
parameter B_WIDTH = 1;
parameter Y_WIDTH = 1;
-
+
input [A_WIDTH-1:0] A;
input [B_WIDTH-1:0] B;
output [Y_WIDTH-1:0] X, Y;
-
+
input CI, BI;
output [Y_WIDTH-1:0] CO;
-
+
wire _TECHMAP_FAIL_ = Y_WIDTH <= 2;
-
+
wire [Y_WIDTH-1:0] A_buf, B_buf;
\$pos #(.A_SIGNED(A_SIGNED), .A_WIDTH(A_WIDTH), .Y_WIDTH(Y_WIDTH)) A_conv (.A(A), .Y(A_buf));
\$pos #(.A_SIGNED(B_SIGNED), .A_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) B_conv (.A(B), .Y(B_buf));
-
+
wire [Y_WIDTH-1:0] AA = A_buf;
- wire [Y_WIDTH-1:0] BB = BI ? ~B_buf : B_buf;
+ wire [Y_WIDTH-1:0] BB = B_buf;
wire [Y_WIDTH-1:0] C = {CO, CI};
-
+
genvar i;
generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice
- ALU #(.ALU_MODE(32'b0))
+ ALU #(.ALU_MODE(2)) // ADDSUB I3 ? add : sub
alu(.I0(AA[i]),
.I1(BB[i]),
- .I3(1'b0),
+ .I3(~BI),
.CIN(C[i]),
.COUT(CO[i]),
.SUM(Y[i])