Datasheet

Functional Description
17
May 2006 SLES043A
NTSC 601 1436
PAL 601 1436
ITU 656
Datastream
Cb
359
1437
1437
Y
718
1438
1438
Cr
359
1439
1439
Y
719
1440
1440
FF
1441
1441
00
…
…
…
1455
1459
10
1456
1460
80
…
…
…
HSYNC
AVID
ITU−R BT.656 timing shown without embedded syncs.
1583
1587
10
1584
1588
80
…
…
…
1711
1723
10
1712
1724
FF
1713
1725
00
1714
1726
00
1715
1727
XX
0
0
Cb
0
NOTE: AVID rising edge occurs 4 SCLK cycles early when in ITU−R BT.656 output
mode.
1
1
Y
0
2
2
Cr
0
3
3
Y
1
− ← 0 → +
AVID Stop
− ← 0 → +
AVID Start
− ← 0 → +
HSYNC Start
Figure 3−10. Horizontal Synchronization Signals
3.16 AVID Cropping
AVID or active video cropping provides a means to decrease bandwidth of the video output. This is
accomplished by horizontally blanking a number of AVID pulses and by vertically blanking a number of lines
per frame. The horizontal AVID cropping is controlled using registers 11h and 12h for start pixels MSB and
LSB, respectively.
Registers 13h and 14h provide access to stop pixels MSB and LSB, respectively. The vertical AVID cropping
is controlled using the vertical blanking (VBLK) start and stop registers at addresses 18h and 19h. Figure 3−11
shows an AVID application.