PPT Slide

module decode2x4(in,en,z);

input en;

input [1:0]in;

output [3:0]z;

reg [3:0]z;

always @ (in or en)

begin

if (!en)

z = 4'bX;

else

case(in)

0: z= 4'b0001;

1: z= 4'b0010;

2: z= 4'b0100;

3: z= 4'b1000;

endcase

end

endmodule

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