AK8813 Datasheet, PDF (25/51 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHIKASEI
[AK8813/14]
♦ AK8813/14 Interface Timing (Part 1) Master mode & ITU-R BT. 656 mode
On ITU-R BT.656 decoding mode or master mode operation, AK8813/14 outputs HSYNC and FID or
VSYNC (selected by register).
When AK8813/14 receives ITU-R BT. 656 signal, AK8813/14 decodes [EAV] code in the data for
synchronization then outputs the HSYNC. AK8813 outputs HSYNC at the rising edge of SYSCLK in the
timing of the 32nd/24th(NTSC/PAL) data slot, which is counted from the [EAV] starting point as below.
(See also AC Characteristics 2-2[Input Synchronizing Signal])
On master mode operation, the front device connected with AK8813/14 (ex. MPEG Decoder) starts to set
Cb on the 276th/288th(NTSC/PAL) slot, after starting to count HSYNC falling edge as
32nd/24th(NTSC/PAL) slot.
FID/VSYNC is output synchronously with HSYNC at the timing of solid line as in Fig. 10 Video Field.
EAV
Y/Cb/Cr Cb Y Cr Y Cb Y Cr Y
Data#
525 system
360
720
360
721
361
722
361
723
Data#
625 system
360
720
360
721
361
722
361
723
SYSCLK
33/ 25T(525 / 625)
HSYNC
Analog OUT
Cb Y Cr
368 736 368
366 732 366
SAV
Y Cb Y Cr Y Cb Y Cr Y Cb
855 428 856 428 857 0 0 0 1 1
861 431 862 431 863 0 0 0 1 1
243/ 263T(525 / 625)
276/ 288T(525 / 625)
TBD T
Fig. 10 Interface Timing (ITU-R BT.656 or Master mode)
Rev.00
- 26 -
2004/Oct