AK8826VN Datasheet, PDF (117/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

■ Video ID
[AK8826VN]
The AK8826 supports to encode the Video ID (EIAJ CPR-1204) which distinguishes the Aspect Ratio etc...
This is also used as CGMS (Copy Generation Management System).
Turning “ON / OFF “of this function is controlled by SDVBID-bit of SD/HD V-Blanking Control Register (R/W) [Sub Address 0x12]
and setting data is set by SD VBID-A Data1/Data2 Register ( 0x2A, 0x2B ).
As for the Video ID setting for component Video Encoder mode is described in another section.
VBID Data Up-date Timing
VSYNC
u-P Data
Set C ontrol R egister
NEW DATA
DATA
OLD DATA
NEW DATA
Fig. 168
VBID Data Code Assignment
20 bit data is configured with Word0 = 2 bits, Word1 = 4 bits, Word2 = 8 bits, CRC = 6 bits.
CRC is automatically calculated and added in the AK8826.
Default values of “CRC Polynomial Expression X6 + X + 1” are all ones.
bit1
DATA
WORD0
2bit
WORD1
4bit
WORD2
8bit
CRC
6bit
VBID Waveform
Ref. bit1 bit2 bit3 ••• bit20
70IRE +/- 10IRE
bit20
0IRE
+
−
10 IRE
5 IRE
2.235usec +/- 50nsec
11.2usec +/- 0.3usec
49.1usec +/- 0.44usec
1H
amplitude
encode line
Fig. 169
525/60 System
70IRE
20/283
MS0972-E-01
117
2008/12