--==========================================================
-- Design units : AssocMemCell
--                (entitiy, architecture and configuration)
--
-- File name    : AssocMemCell.vhd
--
-- Purpose      : One Cell for Associative Memory 
--
-- Limitations  : None
--
-- Library      : WORK
--
-- Dependencies : None
--
-- Author       : Hans-Peter Eich, REFT
--
-- Simulator    : Synopsys V3.1a on SUN SPARCstation 10
--
-------------------------------------------------------------
-- Revision list
-- Version Author Date           Changes
--
-- V1.0    hpe    02.04.95       new
-- V2.0    cjt    18.10.95       ESA-Standard
--===========================================================
LIBRARY IEEE;
USE IEEE.std_logic_1164.all;
USE work.ELEMpack.all;

ENTITY AssocMemCell IS
 
  PORT (WriteEnable : IN std_logic;  -- Enable signal
        DataIn      : IN std_logic;  -- Input data bit
        Mask        : IN std_logic;  -- Input mask bit
        Sel         : IN std_logic;  -- Input select bit
        Match       : OUT std_logic; -- Output match bit
        DataOut     : OUT std_logic);-- Output data bit

END AssocMemCell;

--==========================ARCHITECTURE=====================

ARCHITECTURE Structure OF AssocMemCell IS
  SIGNAL I1_out,I2_out,I3_out,I4_out: std_logic := '0';
BEGIN

I1 : INV
  PORT MAP (Mask,I1_out);

I2 : AND3
  PORT MAP (WriteEnable,I1_out,Sel,I2_out);

I3 : DFF
  PORT MAP (DataIn,I2_out,I3_out);

I4 : NXOR2
  PORT MAP (DataIn,I3_out,I4_out);

I5 : AND2
  PORT MAP (I1_out,I4_out,Match);

I6 : AND2
  PORT MAP (I3_out,Sel,DataOut);

END Structure;

--==========================CONFIGURATION====================

CONFIGURATION AssocMemCellConfig OF AssocMemCell IS

  FOR Structure

    FOR I1 : INV
      USE ENTITY work.inv(Behavior);
    END FOR;

    FOR I2 : AND3
      USE ENTITY work.and3(Behavior);
    END FOR;

    FOR I3 : DFF
      USE ENTITY work.dff(Behavior);
    END FOR;

    FOR I4 : NXOR2
      USE ENTITY work.nxor2(Behavior);
    END FOR;

    FOR ALL : AND2
      USE ENTITY work.and2(Behavior);
    END FOR;

  END FOR;

END AssocMemCellConfig;