DEVICE		20V8;
TITLE		7 BIT COUNTER WITH CARRY IN AND OUT AND SYNCHRONOUS CLEAR;
NAME		C.L.G.;
SIGNATURE	CNT7BIT;

/*  This example can be found on page 5-23 in the GAL handbook            */

PIN	2	=	D0;			/* PARALLEL LOAD DATA     */
PIN	3	=	D1;
PIN	4	=	D2;
PIN	5	=	D3;
PIN	6	=	D4;
PIN	7	=	D5;
PIN	8	=	D6;
PIN	9	=	LD;			/* LOAD CONTROL           */
PIN	10	=	CLEAR;			/* SYNC CLEAR             */

PIN	13	=	OE;
PIN	15	=	CARRYOUT;		/* ASYNC CARRY OUTPUT     */
PIN	16	=	Q6;			/* COUNTER MSB            */
PIN	17	=	Q5;
PIN	18	=	Q4;
PIN	19	=	Q3;
PIN	20	=	Q2;
PIN	21	=	Q1;
PIN	22	=	Q0;
PIN	23	=	CARRYIN;		/* CARRY IN FOR CASCADING */


Q0.D	=
   (  LD &  D0							/* LOAD D0 */
   | !LD & !Q0 & CARRYIN )					/* TOGGLE  */
   & !CLEAR;

Q1.D	=
   (  LD &  D1							/* LOAD D1 */
   | !LD & !Q1 &  Q0 & CARRYIN					/* TOGGLE  */
   | !LD &  Q1 & !Q0 ) 						/* HOLD    */
   & !CLEAR;

Q2.D	= 
   (  LD &  D2							/* LOAD D2 */
   | !LD & !Q2 &    Q1 & Q0 & CARRYIN				/* TOGGLE  */
   | !LD &  Q2 & !( Q1 & Q0 ))					/* HOLD    */
   & !CLEAR;

Q3.D	=
   (  LD &  D3							/* LOAD D3 */
   | !LD & !Q3 &    Q2 & Q1 & Q0 & CARRYIN			/* TOGGLE  */
   | !LD &  Q3 & !( Q2 & Q1 & Q0 ))				/* HOLD    */
   & !CLEAR;

Q4.D	=
   (  LD &  D4							/* LOAD D4 */
   | !LD & !Q4 &    Q3 & Q2 & Q1 & Q0 & CARRYIN			/* TOGGLE  */
   | !LD &  Q4 & !( Q3 & Q2 & Q1 & Q0 ))			/* HOLD    */
   & !CLEAR;

Q5.D	=
   (  LD &  D5							/* LOAD D5 */
   | !LD & !Q5 &    Q4 & Q3 & Q2 & Q1 & Q0 & CARRYIN		/* TOGGLE  */
   | !LD &  Q5 & !( Q4 & Q3 & Q2 & Q1 & Q0 ))			/* HOLD    */
   & !CLEAR;

Q6.D	=
   (  LD &  D6							/* LOAD D6 */
   | !LD & !Q6 &    Q5 & Q4 & Q3 & Q2 & Q1 & Q0 & CARRYIN	/* TOGGLE  */
   | !LD &  Q6 & !( Q5 & Q4 & Q3 & Q2 & Q1 & Q0 ))		/* HOLD    */
   & !CLEAR;

/* Async carry out                                                         */

CARRYOUT = !LD & Q6 & Q5 & Q4 & Q3 & Q2 & Q1 & Q0 & CARRYIN;