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mux_demux/mux_demux.v

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+/*
+    Mux / Demux
+
+
+    Mux
+
+    a   b   sel |   out
+    -------------------
+    0   0   0   |   0
+    1   0   0   |   1
+    0   1   1   |   1
+    1   0   1   |   0
+    ...
+
+*/
+
+module mux_2n1 #(parameter N = 8) (
+    input [N-1:0] a,
+    input [N-1:0] b,
+    input sel,
+    output [N-1:0] out
+);
+    assign out = sel ? b : a;
+endmodule
+
+module demux_1n2 #(parameter N = 8) (
+    input [N-1:0] in,
+    input sel,
+    output [N-1:0] a,
+    output [N-1:0] b
+);
+    assign a = sel ? 0 : in;
+    assign b = sel ? in : 0;
+endmodule