-------------------------------------------------------------------------------
-- File: irgreater.vhd
--
-- Project: DPF
-- Date: 3/4/02
--
-- Purpose: N-bit comparitor, if the value of dataA is 
--			greater than the value of dataB the ouput is set to '1'
--
--			Modified from the megafunction provided by altera 
--
-- Inputs:  	dataA		-- input A
--				dataB		-- input B
--				
--
-- Outputs:    	AgeB       -- return from the comparision 
--						   -- valid if A >= B
-- External Connections:
--      		
-------------------------------------------------------------------------------

LIBRARY ieee;
USE ieee.std_logic_1164.all;
LIBRARY lpm;
USE lpm.lpm_components.all;

entity irgreater IS
	generic(compareWidth : positive := 8);
	port
	(
		dataA		: in std_logic_vector (compareWidth-1 DOWNTO 0);
		dataB		: in std_logic_vector (compareWidth-1 DOWNTO 0);
		AgeB		: out STD_LOGIC 
	);
END irgreater;

ARCHITECTURE SYN OF irgreater IS

component lpm_compare
	generic(
				lpm_width		: NATURAL;
				one_input_is_constant		: STRING;
				lpm_representation		: STRING
			);
	port(
			dataa	: IN STD_LOGIC_VECTOR (compareWidth-1 DOWNTO 0);
			datab	: IN STD_LOGIC_VECTOR (compareWidth-1 DOWNTO 0);
			AgeB	: OUT STD_LOGIC 
		);
end component;

signal compareValue	: STD_LOGIC;
begin
	AgeB <= compareValue;
	lpm_compare_component : lpm_compare
	generic map(
					LPM_WIDTH => compareWidth,
					ONE_INPUT_IS_CONSTANT => "NO",
					LPM_REPRESENTATION => "UNSIGNED"
				)
	port map(
				dataa => dataA,
				datab => dataB,
				AgeB => compareValue
			);
END SYN;