5 Write the VHDL code for the 8to3 priority encoder shown be

5. Write the VHDL code for the 8-to-3 priority encoder shown below using the withselect construct: outputs inputs

Solution

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;  

ENTITY encoder IS
    PORT( x : in STD_LOGIC_VECTOR(7 DOWNTO 0);
                   y : out STD_LOGIC_VECTOR(2 DOWNTO 0) );
END encoder;


ARCHITECTURE arc OF priorityencoder8to3 IS
BEGIN
   

WITH a SELECT y <=

        \"000\" WHEN \"10000000\",
        \"001\" WHEN \"01000000\",
        \"010\" WHEN \"00100000\",
        \"011\" WHEN \"00010000\",
        \"100\" WHEN \"00001000\",
        \"101\" WHEN \"00000100\",
        \"110\" WHEN \"00000010\",
        \"111\" WHEN \"00000001\",
         \"zzz\" WHEN \"others\";


END arc;