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Add force_downto and force_upto wire attributes.

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Fixes #2058.
This commit is contained in:
Marcelina Kościelnicka 2020-05-18 18:15:03 +02:00
parent 2d573a0ff6
commit aee439360b
43 changed files with 258 additions and 27 deletions
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10
techlibs/ecp5/arith_map.v
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@ -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;

1
techlibs/ecp5/cells_map.v
View file

@ -70,6 +70,7 @@ module \$lut (A, Y);
parameter WIDTH = 0;
parameter LUT = 0;
(* force_downto *)
input [WIDTH-1:0] A;
output Y;