File size: 762 Bytes
8dc19e4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | // Quad 2-input multiplexer (inverted outputs)
module ttl_74158 #(parameter BLOCKS = 4, WIDTH_IN = 2, WIDTH_SELECT = $clog2(WIDTH_IN),
DELAY_RISE = 0, DELAY_FALL = 0)
(
input Enable_bar,
input [WIDTH_SELECT-1:0] Select,
input [BLOCKS*WIDTH_IN-1:0] A_2D,
output [BLOCKS-1:0] Y_bar
);
//------------------------------------------------//
wire [WIDTH_IN-1:0] A [0:BLOCKS-1];
reg [BLOCKS-1:0] computed;
integer i;
always @(*)
begin
for (i = 0; i < BLOCKS; i++)
begin
if (!Enable_bar)
computed[i] = A[i][Select];
else
computed[i] = 1'b0;
end
end
//------------------------------------------------//
`ASSIGN_UNPACK_ARRAY(BLOCKS, WIDTH_IN, A, A_2D)
assign #(DELAY_RISE, DELAY_FALL) Y_bar = ~computed;
endmodule
|