xorgate2.pat

i need of vhdl code for 32-bit risc processor

in a8 B;
in b8 B;
out d8 B;

begin
pat_0 :0 0  ?0;
pat_1 :0 1  ?1;
pat_2 :1 0  ?1;
pat_3 :1 1  ?0;

end;