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  ../../images/main/bullet_green_ball.gif Priority Encoders
   

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  ../../images/main/bulllet_4dots_orange.gif Pri-Encoder - Using if-else Statement
   

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  1 -------------------------------------------------------
  2 -- Design Name : pri_encoder_using_if
  3 -- File Name   : pri_encoder_using_if.vhd
  4 -- Function    : Pri Encoder using If
  5 -- Coder       : Deepak Kumar Tala (Verilog)
  6 -- Translator  : Alexander H Pham (VHDL)
  7 -------------------------------------------------------
  8 library ieee;
  9     use ieee.std_logic_1164.all;
 10     
 11 entity pri_encoder_using_if is
 12     port (
 13         enable     :in  std_logic;                     --  Enable for the encoder
 14         encoder_in :in  std_logic_vector (15 downto 0);--  16-bit Input
 15         binary_out :out std_logic_vector (3 downto 0)  --  4 bit binary Output
 16 
 17     );
 18 end entity;
 19 
 20 architecture behavior of pri_encoder_using_if is
 21 
 22 begin
 23     process (enable, encoder_in) begin
 24         binary_out <= "0000";
 25         if (enable = '1') then
 26             if (encoder_in = "XXXXXXXXXXXXXX10") then
 27                 binary_out <= "0001";
 28             elsif (encoder_in = "XXXXXXXXXXXXX100") then
 29                 binary_out <= "0010";
 30             elsif (encoder_in = "XXXXXXXXXXXX1000") then
 31                 binary_out <= "0011";
 32             elsif (encoder_in = "XXXXXXXXXXX10000") then
 33                 binary_out <= "0100";
 34             elsif (encoder_in = "XXXXXXXXXX100000") then
 35                 binary_out <= "0101";
 36             elsif (encoder_in = "XXXXXXXXX1000000") then
 37                 binary_out <= "0110";
 38             elsif (encoder_in = "XXXXXXXX10000000") then
 39                 binary_out <= "0111";
 40             elsif (encoder_in = "XXXXXXX100000000") then
 41                 binary_out <= "1000";
 42             elsif (encoder_in = "XXXXXX1000000000") then
 43                 binary_out <= "1001";
 44             elsif (encoder_in = "XXXXX10000000000") then
 45                 binary_out <= "1010";
 46             elsif (encoder_in = "XXXX100000000000") then
 47                 binary_out <= "1011";
 48             elsif (encoder_in = "XXX1000000000000") then
 49                 binary_out <= "1100";
 50             elsif (encoder_in = "XX10000000000000") then
 51                 binary_out <= "1101";
 52             elsif (encoder_in = "X100000000000000") then
 53                 binary_out <= "1110";
 54             else
 55                 binary_out <= "1111";
 56             end if;
 57         end if;
 58     end process;
 59 end architecture;
You could download file vhdl_examples here
   

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  ../../images/main/bulllet_4dots_orange.gif Encoder - Using when Statement
   

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  1 -------------------------------------------------------
  2 -- Design Name : pri_encoder_using_when
  3 -- File Name   : pri_encoder_using_when.vhd
  4 -- Function    : Pri Encoder using when-else
  5 -- Coder       : Deepak Kumar Tala (Verilog)
  6 -- Translator  : Alexander H Pham (VHDL)
  7 -- Fixed       : Tomasz Olszewski 
  8 -------------------------------------------------------
  9 library ieee;
 10     use ieee.std_logic_1164.all;
 11 
 12 entity pri_encoder_using_when is
 13     port (
 14         enable     :in  std_logic;                     --  Enable for the encoder
 15         encoder_in :in  std_logic_vector (15 downto 0);--  16-bit Input
 16         binary_out :out std_logic_vector (3 downto 0)  --  4 bit binary Output
 17 
 18     );
 19 end entity;
 20 
 21 architecture behavior of pri_encoder_using_when is
 22 
 23 begin
 24     binary_out <= "0000" when enable = '0' else
 25               "0001" when encoder_in( 1 ) = '1' else
 26               "0010" when encoder_in( 2 ) = '1' else
 27               "0011" when encoder_in( 3 ) = '1' else
 28               "0100" when encoder_in( 4 ) = '1' else
 29               "0101" when encoder_in( 5 ) = '1' else
 30               "0110" when encoder_in( 6 ) = '1' else
 31               "0111" when encoder_in( 7 ) = '1' else
 32               "1000" when encoder_in( 8 ) = '1' else
 33               "1001" when encoder_in( 9 ) = '1' else
 34               "1010" when encoder_in( 10 ) = '1' else
 35               "1011" when encoder_in( 11 ) = '1' else
 36               "1100" when encoder_in( 12 ) = '1' else
 37               "1101" when encoder_in( 13 ) = '1' else
 38               "1110" when encoder_in( 14 ) = '1' else
 39               "1111" when encoder_in( 15 ) = '1' else
 40               "0000"; 
 41 
 42 end architecture;
You could download file vhdl_examples here
   

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Copyright 1998-2014

Deepak Kumar Tala - All rights reserved

Do you have any Comment? mail me at:deepak@asic-world.com