G2R-14-12VDC Datasheet, PDF (18/73 Pages) Texas Instruments – Ultralow Power NTSC/PAL/SECAM Video Decoder With RObust Sync Detector

ITU-R BT.656 timing.
NTSC 601 1436 1437 1438 1439 1440 1441 … 1455 1456 … 1583 1584 ^… 1711 1712 1713 1714 1715 0 1 2 3
PAL 601 1436 1437 1438 1439 1440 1441 … 1459 1460 … 1587 1588 ^… 1723 1724 1725 1726 1727 0 1 2 3
ITU 656
Cb Y Cr Y FF 00 … 10
Datastream ^{359 718 359 719}
80 … 10
80 ^… 10 FF 00 00 XX Cb Y Cr Y
0001
HSYNC
AVID
↔
HSYNC Start
↔
AVID Stop
NOTE: AVID rising edge occurs 4 SCLK cycles early when in the ITU-R BT.656 output mode.
Figure 2−3. Horizontal Synchronization Signals
↔
AVID Start
2.13 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 2−4 shows
an AVID application.
2−7