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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 | // 8-input multiplexer
module ttl_74151 #(parameter WIDTH_IN = 8, WIDTH_SELECT = $clog2(WIDTH_IN),
DELAY_RISE = 0, DELAY_FALL = 0)
(
input Enable_bar,
input [WIDTH_SELECT-1:0] Select,
input [WIDTH_IN-1:0] D,
output Y,
output Y_bar
);
//------------------------------------------------//
reg computed;
always @(*)
begin
if (!Enable_bar)
computed = D[Select];
else
computed = 1'b0;
end
//------------------------------------------------//
assign #(DELAY_RISE, DELAY_FALL) Y = computed;
assign #(DELAY_RISE, DELAY_FALL) Y_bar = ~computed;
endmodule
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