ecp5: Fixing arith_map

Signed-off-by: David Shah <davey1576@gmail.com>

diff --git a/techlibs/ecp5/arith_map.v b/techlibs/ecp5/arith_map.v
index 3c2b86deb71c803c0275165ce2fe2526cc92977f..cf21ee80e12c11187517bb17b221df52da987cb7 100644 (file)
--- a/techlibs/ecp5/arith_map.v
+++ b/techlibs/ecp5/arith_map.v
@@ -51,7 +51,7 @@ module _80_ecp5_alu (A, B, CI, BI, X, Y, CO);
        wire [Y_WIDTH2-1:0] AA = A_buf;
        wire [Y_WIDTH2-1:0] BB = BI ? ~B_buf : B_buf;
        wire [Y_WIDTH2-1:0] C = {CO, CI};
-       wire [Y_WIDTH2-1:0] FCO;
+       wire [Y_WIDTH2-1:0] FCO, Y1;
 
        genvar i;
        generate for (i = 0; i < Y_WIDTH2; i = i + 2) begin:slice
@@ -64,14 +64,15 @@ module _80_ecp5_alu (A, B, CI, BI, X, Y, CO);
                        .CIN(C[i]),
                        .A0(AA[i]), .B0(BB[i]), .C0(1'b0), .D0(1'b1),
                        .A1(AA[i+1]), .B1(BB[i]), .C1(1'b0), .D1(1'b1),
-                       .S0(F0), .S1(F1),
+                       .S0(Y[i]), .S1(Y1[i]),
                        .COUT(FCO[i])
                );
 
                assign CO[i] = (AA[i] && BB[i]) || (C[i] && (AA[i] || BB[i]));
-               if (i < Y_WIDTH)
+               if (i < Y_WIDTH) begin
                        assign CO[i+1] = FCO[i];
-
+                       assign Y[i+1] = Y1[i];
+               end
        end endgenerate
 
        assign X = AA ^ BB;