Verilog code for 2-to-4 line Decoder:

How to program 2-to-4 line Decoder in verilog?
A Decoder is a simple logic gates diagram that changes a code into a set of different signals. Decoder is the reverse process of Encoders.
A simple/common  decoder is the line decoder which takes an n-digit binary number and decodes it into 2ⁿ data lines. The simplest decoder is the 1-to-2 line decoder. Following is the truth table of 1-to-2 line decoder,

Following is the truth table of 2-to-4 line decoder ;

when it developed into a logic circuit it looks like

Verilog code of 2 to 4 line decoder:

module decoder(d,A0,A1);

output [3:0] d;

input x,y;

assign d[0] = ~A0 & ~A1 ;

assign d[1] = A0 & ~A1;

assign d[2] = ~A0 & A1;

assign d[3] = A0 & A1 ;

endmodule

fpga verilog code example