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add POLARITY parameter to $priority cell

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This commit is contained in:
Emil J. Tywoniak 2026-01-09 21:02:58 +01:00
parent e166dd4475
commit 7e664834b3
8 changed files with 38 additions and 17 deletions
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16
techlibs/common/techmap.v
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@ -682,7 +682,8 @@ endmodule
(* techmap_celltype = "$priority" *)
module \$priority (A, Y);
parameter WIDTH = 3;
parameter WIDTH = 0;
parameter POLARITY = 0;
(* force_downto *)
input [WIDTH-1:0] A;
@ -691,16 +692,21 @@ module \$priority (A, Y);
(* force_downto *)
wire [WIDTH-1:0] tmp;
(* force_downto *)
wire [WIDTH-1:0] A_active;
wire [WIDTH-1:0] Y_active;
assign A_active = A ^ ~POLARITY;
assign Y = Y_active ^ ~POLARITY;
genvar i;
generate
if (WIDTH > 0) begin
assign tmp[0] = A[0];
assign Y[0] = A[0];
assign tmp[0] = A_active[0];
assign Y_active[0] = A_active[0];
end
for (i = 1; i < WIDTH; i = i + 1) begin
assign Y[i] = A[i] & ~tmp[i-1];
assign tmp[i] = tmp[i-1] | A[i];
assign Y_active[i] = tmp[i-1] ? 1'b0 : A_active[i];
assign tmp[i] = tmp[i-1] | A_active[i];
end
endgenerate