-- file nam : PASCRDU.VHD
-- file is use to combine all the components
-- INPUTS : FORCU : FORWARD INPUT FROM CONTROL UNIT
--- REVCU:REVERSE INPUT FROM CONTROL UNIT
--- APFADU:POSITIVE AC CYCLE INPUT FROM FIRING ANGLE DELAY MEASURING 
--- CIRCUIT.
--- ANFADU: NEGATIVE AC CYCLE INPUT FROM FIRING ANGLE DELAY 
--- MEASURING CIRCUIT.
--- FSCRBDATA: 4 BITS OUTPUT GOING TO MOTOR FORWARD SCR BRIDGE.
--- RSCRBDATA: 4 BITS OUTPUT GOING TO MOTOR REVERSED SCR BRIDGE.
--  ALL OUTPUTS ARE ACTIVE LOW 
--  ALL THE INPUTS ARE ACTIVE HIGH 

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;


ENTITY PASCRDU  is

PORT(
		FORCU,REVCU,APFADU,ANFADU: IN STD_LOGIC ;
		FSCRBDATA,RSCRBDATA: OUT STD_LOGIC_VECTOR(3 DOWNTO 0)
			);
END PASCRDU ;

architecture BEHAV of PASCRDU  is

--COMPONENT pb1scrdout2
COMPONENT pb1so2 

PORT (	
		FORC,REVC, APFAC, ANFAC : IN STD_LOGIC;
		FOR1, REV1 : OUT STD_LOGIC 
			);
END COMPONENT ;

COMPONENT pbdecoder 
PORT (
		APFAC ,ANFAC :IN STD_LOGIC ;
		SCROUT : OUT STD_LOGIC_VECTOR(3 DOWNTO 0)
		);
END COMPONENT ;

COMPONENT PSCRFBUFF
PORT (
		FORB1 : IN STD_LOGIC ;
		SCRDATA : IN STD_LOGIC_VECTOR(3 DOWNTO 0);
		FSCRDATA: OUT STD_LOGIC_VECTOR(3 DOWNTO 0)
		);
END COMPONENT ;

COMPONENT pscrrbuff
PORT (
		REVB1 : IN STD_LOGIC;
		SCRDATA : IN STD_LOGIC_VECTOR(3 DOWNTO 0);
		RSCRDATA: OUT STD_LOGIC_VECTOR(3 DOWNTO 0)
		);
END COMPONENT ;

SIGNAL FORBC,REVBC : STD_LOGIC;
SIGNAL SCRSEL : STD_LOGIC_VECTOR(3 DOWNTO 0);

BEGIN

PROTECTIONBLK: pb1so2 port map(
								FORC=> FORCU,
								REVC=> REVCU,
								APFAC=> APFADU,
								ANFAC=> ANFADU,
								FOR1=> FORBC,
								REV1=> REVBC
								);
SCRDECODER: pbdecoder port map(
								APFAC=> APFADU,
								ANFAC=> ANFADU,
								SCROUT=> SCRSEL
								);
FORBRIDGEBUFF: pscrfbuff port map(
								FORB1=> FORBC,
								SCRDATA=> SCRSEL,
								FSCRDATA=> FSCRBDATA
								);
REVBRIDGEBUFF: pscrrbuff port map(
								REVB1=> REVBC,
								SCRDATA=> SCRSEL,
								RSCRDATA=> RSCRBDATA
								);
END BEHAV;