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Add $bmux and $demux cells.

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Marcelina Kościelnicka 2022-01-24 16:02:29 +01:00
parent db33b1e535
commit 93508d58da
25 changed files with 694 additions and 49 deletions
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39
techlibs/common/techmap.v
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@ -59,7 +59,7 @@ module _90_simplemap_compare_ops;
endmodule
(* techmap_simplemap *)
(* techmap_celltype = "$pos $slice $concat $mux $tribuf" *)
(* techmap_celltype = "$pos $slice $concat $mux $tribuf $bmux" *)
module _90_simplemap_various;
endmodule
@ -597,6 +597,43 @@ module _90_pmux (A, B, S, Y);
assign Y = |S ? Y_B : A;
endmodule
// --------------------------------------------------------
// Demultiplexers
// --------------------------------------------------------
(* techmap_celltype = "$demux" *)
module _90_demux (A, S, Y);
parameter WIDTH = 1;
parameter S_WIDTH = 1;
(* force_downto *)
input [WIDTH-1:0] A;
(* force_downto *)
input [S_WIDTH-1:0] S;
(* force_downto *)
output [(WIDTH << S_WIDTH)-1:0] Y;
generate
if (S_WIDTH == 0) begin
assign Y = A;
end else if (S_WIDTH == 1) begin
assign Y[0+:WIDTH] = S ? 0 : A;
assign Y[WIDTH+:WIDTH] = S ? A : 0;
end else begin
localparam SPLIT = S_WIDTH / 2;
wire [(1 << (S_WIDTH-SPLIT))-1:0] YH;
wire [(1 << SPLIT)-1:0] YL;
$demux #(.WIDTH(1), .S_WIDTH(SPLIT)) lo (.A(1'b1), .S(S[SPLIT-1:0]), .Y(YL));
$demux #(.WIDTH(1), .S_WIDTH(S_WIDTH-SPLIT)) hi (.A(1'b1), .S(S[S_WIDTH-1:SPLIT]), .Y(YH));
genvar i;
for (i = 0; i < (1 << S_WIDTH); i = i + 1) begin
localparam [S_WIDTH-1:0] IDX = i;
assign Y[i*WIDTH+:WIDTH] = (YL[IDX[SPLIT-1:0]] & YH[IDX[S_WIDTH-1:SPLIT]]) ? A : 0;
end
end
endgenerate
endmodule
// --------------------------------------------------------
// LUTs