---- opp_hitmap.vhd
---					V1.0 			8/04/99 Tsuyoshi NAKAYA (UC : nakaya@hep.uchicago.edu)
----	The module to generate the hit status map based on hitmap and long cluster map
----
----	Layer Map and the HIT_STAT word result
----	x : miss hit,   *: long cluster bit, % either miss hit or long cluster bit
----	hit_stat	Layer with a hit	
----   
----    V2.0: Hit status information are reduced to 4 bits because of extra one bit request
----          From L2 interface board. 10/17/00 U.K. Yang
----
----	0		(0,1,2,3,4)
----	1		(0,1,2,3,%)
----	2		(0,1,2,%,4)
----	3		(0,1,%,3,4)
----	4		(0,%,2,3,4)
----	5		(%,1,2,3,4)
----	6		(1,2,3,x,*) or (1,2,3,x,x) 
----	 		(1,2,3,*,x) or (1,2,3,*,*)
----	7		(1,2,x,4,*) or (1,2,x,4,x) 
----	 		(1,2,*,4,x) or (1,2,*,4,*)
----	8		(1,2,x,*,5) or (1,2,x,x,5) 
----			(1,2,*,x,5) or (1,2,*,*,5)
----	9		(1,x,3,4,*) or (1,x,3,4,x) 
----			(1,*,3,4,x) or (1,*,3,4,*)
----	10		(1,x,3,*,5) or (1,x,3,x,5) 
----			(1,*,3,x,5) or (1,*,3,*,5)
----	11		(1,x,*,4,5) or (1,x,x,4,5) 
----			(1,*,x,4,5) or (1,*,*,4,5)
----	12		(x,2,3,4,*) or (x,2,3,4,x) 
----			(*,2,3,4,x) or (*,2,3,4,*)
----	13		(x,2,3,*,5) or (x,2,3,x,5) 
----			(*,2,3,x,5) or (*,2,3,*,5)
----	14		(x,2,*,4,5) or (x,2,x,4,5) 
----			(*,2,x,4,5) or (*,2,*,4,5)
----			(x,*,3,4,5) or (x,x,3,4,5) 
----			(*,x,3,4,5) or (*,*,3,4,5)
----	15		Any others

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
LIBRARY lpm;
USE lpm.lpm_components.ALL;
LIBRARY altera;
USE altera.maxplus2.ALL;
USE work.tf_def.ALL;

ENTITY opp_hitmap IS
PORT(   clk : IN STD_LOGIC;
	hitmap, lclmap : IN SVX_PLANE ;
	hit_stat : OUT HIT_STAT_WORD);

END opp_hitmap;

ARCHITECTURE a OF opp_hitmap IS
	SIGNAL badmap, missmap : SVX_PLANE;
BEGIN

	missmap <= NOT hitmap;
	badmap <= missmap OR lclmap;

	hit_word : PROCESS (clk)
	BEGIN
		WAIT UNTIL clk'EVENT AND clk = '1';

	-----	NO BAD HIT in any SVX laers : 0
		IF (badmap = ('0','0','0','0','0')) THEN
			hit_stat <= ('0','0','0','0','0');  --0

	-----	ONE BAD HIT in the SVX laers : 1-5
		ELSIF (badmap = ('0','0','0','0','1')) THEN
			hit_stat <= ('0','0','1','0','1');  --5

		ELSIF (badmap = ('0','0','0','1','0')) THEN
			hit_stat <= ('0','0','1','0','0');  --4

		ELSIF (badmap = ('0','0','1','0','0')) THEN
			hit_stat <= ('0','0','0','1','1');  --3

		ELSIF (badmap = ('0','1','0','0','0')) THEN
			hit_stat <= ('0','0','0','1','0');  --2

		ELSIF (badmap = ('1','0','0','0','0')) THEN
			hit_stat <= ('0','0','0','0','1');  --1

	-----	TWO BAD HITs in the SVX laers : 6-14

		ELSIF (badmap = ('0','0','0','1','1')) THEN

			hit_stat <= ('0','1','1','1','0');  -- 14

		ELSIF (badmap = ('0','0','1','0','1')) THEN

			hit_stat <= ('0','1','1','1','0');  -- 14
	
		ELSIF (badmap = ('0','1','0','0','1')) THEN

			hit_stat <= ('0','1','1','0','1');  -- 13

		ELSIF (badmap = ('1','0','0','0','1')) THEN

			hit_stat <= ('0','1','1','0','0');  -- 12
	
		ELSIF (badmap = ('0','0','1','1','0')) THEN	    	

			hit_stat <= ('0','1','0','1','1');  -- 11
	
		ELSIF (badmap = ('0','1','0','1','0')) THEN

			hit_stat <= ('0','1','0','1','0');  -- 10

		ELSIF (badmap = ('1','0','0','1','0')) THEN
	
			hit_stat <= ('0','1','0','0','0');  -- 9

		ELSIF (badmap = ('0','1','1','0','0')) THEN

			hit_stat <= ('0','1','0','0','0');  -- 8
	
		ELSIF (badmap = ('1','0','1','0','0')) THEN
	
			hit_stat <= ('0','0','1','1','1');  -- 7
	
		ELSIF (badmap = ('1','1','0','0','0')) THEN
	
			hit_stat <= ('0','0','1','1','0');  -- 6
		
		ELSE
	
			hit_stat <= ('0','1','1','1','1');   -- 15

		END IF;
	END PROCESS;

END a;