REV. 0

AD9848/AD9849

–24–

H-Counter Synchronization

The H-Counter reset occurs on the sixth CLI rising edge fol-

lowing the HD falling edge. The PxGA steering is synchronized

with the reset of the internal H-Counter. (See Figure 13.)

000

1

1

2

111

0

0

3

11

00

01234

5

6

7

8

9

10

11

12

14

15

0

1

2

3

02

3

4

H-COUNTER

RESET

VD

NOTES

1. INTERNAL H-COUNTER IS RESET ON THE SIXTH CLI RISING EDGE FOLLOWING THE HD FALLING EDGE.

2. PxGA STEERING IS SYNCRONIZED WITH THE RESET OF THE INTERNAL H-COUNTER (MOSAIC SEPARATE MODE IS SHOWN).

3. VD FALLING EDGE SHOULD OCCUR ONE CLOCK CYCLE BEFORE HD FALLING EDGE FOR PROPER PxGA LINE SYNCHRONIZATION.

HD

XX

XX

X

X

X

PxGA GAIN

REGISTER

CLI

XX

XX

X

X

X

H-COUNTER

(PIXEL COUNTER)

3ns MIN

23

5

3ns MIN

X

X

Figure 13. H-Counter Synchronization