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BCD TO BINARY


module bcd2binary
(input [7:0]bcd,
output reg[3:0]binary);

always@(bcd)
begin
if(bcd[3:0]<4'b1010)
begin
if(bcd[7:4]=={4{1'b0}})
binary=bcd[3:0];
if((bcd[7:5]=={3{1'b0}})&&(bcd[4]==1'b1))
binary=bcd[3:0]+4'b1010;
end
else
binary={4{1'bx}};

end
endmodule

TEST BENCH

module bcd2binary_tb;
reg [7:0]bcd;
wire [3:0]binary;

bcd2binary b1(bcd,binary);
initial
begin
bcd=8'b00000000;
$monitor($time, ,"bcd", ,"%b",bcd,  , "bin","ary", ,"%b",binary);
end

always
#1 bcd=bcd+1;

initial
#22 $stop;
endmodule

You can also check more verilog code on
http://generaldownload1.blogspot.in/2013/11/all-besic-verilog-code.html