DEVICE		16V8;
TITLE		4 BIT UP DOWN COUNTER;
NAME		C.L.G.;
SIGNATURE	CNT4UPDN;

PIN	1	=	CLK;
PIN	7	=	CNTL0;
PIN	8	=	CNTL1;
PIN	11	=	OE;

PIN	2	=	I0;
PIN	3	=	I1;
PIN	4	=	I2;
PIN	5	=	I3;

PIN	16	=	Q3;
PIN	17	=	Q2;
PIN	18	=	Q1;
PIN	19	=	Q0;

Q3.D =  CNTL0 & !CNTL1 &  I3				/* LOAD         */
     | !CNTL0 &  CNTL1 & !Q0 & !Q1 & !Q2 & !Q3		/* DOWN         */
     | !CNTL0 &  CNTL1 &  Q0 &  Q1 &  Q2 &  Q3
     |  CNTL0 &  CNTL1 & !Q0 & !Q1 & !Q2 &  Q3		/* UP           */
     |  CNTL0 &  CNTL1 &  Q0 &  Q1 &  Q2 & !Q3
     |           CNTL1 &  Q0 &       !Q2 &  Q3		/* UP OR DOWN   */
     |           CNTL1 &       !Q1 &  Q2 &  Q3
     |           CNTL1 & !Q0 &  Q1 &        Q3;


Q2.D =  CNTL0 & !CNTL1 &  I2				/* LOAD         */
     | !CNTL0 &  CNTL1 & !Q0 & !Q1 & !Q2		/* DOWN         */
     | !CNTL0 &  CNTL1 &        Q1 &  Q2
     |  CNTL0 &  CNTL1 &       !Q1 &  Q2
     |  CNTL0 &  CNTL1 &  Q0 &  Q1 & !Q2
     |           CNTL1 & !Q0 &  Q1 &  Q2
     |           CNTL1 &  Q0 & !Q1 &  Q2;

Q1.D =  CNTL0 & !CNTL1 &  I1				/* LOAD         */
     | !CNTL0 &  CNTL1 & !Q0 & !Q1
     | !CNTL0 &  CNTL1 &  Q0 &  Q1
     |  CNTL0 &  CNTL1 & !Q0 &  Q1
     |  CNTL0 &  CNTL1 &  Q0 & !Q1;

Q0.D =  CNTL0 & !CNTL1 &  I0
     |           CNTL1 & !Q0;