Design of 8 : 3 Priority Encoder using std_match function (when - else) VHDL Code.

Design of 8 : 3 Priority Encoder using    std_match   function  & When - Else

Output Waveform : 8 : 3 Priority Encoder

Output Waveform : 8 : 3 Priority Encoder

 VHDL Code -



-------------------------------------------------------------------------------
--
-- Title       : priority_encoder_8_3
-- Design      : vhdl_upload2
-- Author      : Naresh Singh Dobal
-- Company     : nsdobal@gmail.com
-- Verilog HDL Programs &  Exercise with Naresh Singh Dobal.
--
-------------------------------------------------------------------------------
--
-- File        : Design of 8 to 3 Priority Encoder using when else.vhd

   

library IEEE;
use IEEE.STD_LOGIC_1164.all;  
use ieee.numeric_std.all;

entity priority_encoder_8_3 is
     port(
         din : in STD_LOGIC_VECTOR(7 downto 0);
         dout : out STD_LOGIC_VECTOR(2 downto 0)
         );
end priority_encoder_8_3;


architecture priority_enc_arc of priority_encoder_8_3 is
begin
   
dout <= "000" when std_match (din,"1-------") else
        "001" when std_match (din,"01------") else
        "010" when std_match (din,"001-----") else
        "011" when std_match (din,"0001----") else
        "100" when std_match (din,"00001---") else
        "101" when std_match (din,"000001--") else
        "110" when std_match (din,"0000001-") else
        "111" when std_match (din,"00000001");
   

end priority_enc_arc;