diff options
Diffstat (limited to 'techlibs/ecp5/arith_map.v')
| -rw-r--r-- | techlibs/ecp5/arith_map.v | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/techlibs/ecp5/arith_map.v b/techlibs/ecp5/arith_map.v index 17bde0497..ffd42469c 100644 --- a/techlibs/ecp5/arith_map.v +++ b/techlibs/ecp5/arith_map.v @@ -26,15 +26,20 @@ module _80_ecp5_alu (A, B, CI, BI, X, Y, CO); parameter B_WIDTH = 1; parameter Y_WIDTH = 1; + (* force_downto *) input [A_WIDTH-1:0] A; + (* force_downto *) input [B_WIDTH-1:0] B; + (* force_downto *) output [Y_WIDTH-1:0] X, Y; input CI, BI; + (* force_downto *) output [Y_WIDTH-1:0] CO; wire _TECHMAP_FAIL_ = Y_WIDTH <= 4; + (* force_downto *) 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)); @@ -48,10 +53,15 @@ module _80_ecp5_alu (A, B, CI, BI, X, Y, CO); localparam Y_WIDTH2 = round_up2(Y_WIDTH); + (* force_downto *) wire [Y_WIDTH2-1:0] AA = A_buf; + (* force_downto *) wire [Y_WIDTH2-1:0] BB = BI ? ~B_buf : B_buf; + (* force_downto *) wire [Y_WIDTH2-1:0] BX = B_buf; + (* force_downto *) wire [Y_WIDTH2-1:0] C = {CO, CI}; + (* force_downto *) wire [Y_WIDTH2-1:0] FCO, Y1; genvar i; |