Subversion Repositories am9080_cpu_based_on_microcoded_am29xx_bit-slices

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-- Company: 
-- Engineer: 
-- 
-- Create Date: 09/24/2017 10:11:13 AM
-- Design Name: 
-- Module Name: Am25LS257 - Behavioral
-- Project Name: 
-- Target Devices: 
-- Tool Versions: 
-- Description: 
-- 
-- Dependencies: 
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-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
-- 
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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
 
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
 
-- Uncomment the following library declaration if instantiating
-- any Xilinx leaf cells in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
 
entity Am25LS257 is
    Port ( a : in STD_LOGIC_VECTOR (3 downto 0);
           b : in STD_LOGIC_VECTOR (3 downto 0);
           s : in STD_LOGIC;
           nOE : in STD_LOGIC;
           y : out STD_LOGIC_VECTOR (3 downto 0));
end Am25LS257;
 
architecture Behavioral of Am25LS257 is
 
signal y_internal: std_logic_vector(3 downto 0);
 
begin
 
y_internal <= a when (s = '0') else b;
y <= y_internal when (nOE = '0') else "ZZZZ";
 
end Behavioral;