ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 121

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

■ Video ID
The AK8825 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
and setting data is set by SD VBID-A Data1/Data2 Register ( 0x2A, 0x2B ) .
Video ID information has the highest order of priority among VBI information (when simultaneous output with Macrovision
signaling occurs, only the VBI information is super-imposed on this line).
As for the Video ID setting for component Video Encoder mode is described in another section.
VBID Data Up-date Timing
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 AK8825.
Default values of “CRC Polynomial Expression X6 + X + 1” are all ones.
DATA
VBID Waveform
Rev-E-00
bit1
V S Y N C
WORD0
u-P D a ta
D A T A
2bit
11.2usec +/- 0.3usec
WORD1
4bit
amplitude
encode line
Ref.
2.235usec +/- 50nsec
SDVBID-bit of SD/HD V-Blanking Control Register (R/W) [Sub Address 0x12]
bit1 bit2 bit3
S et C ontro l R egister
1H
49.1usec +/- 0.44usec
N EW D AT A
O LD D A T A
Fig. 169
Fig. 170
121
WORD2
8bit
•••
525/60 System
20/283
70IRE
bit20
70IRE +/- 10IRE
0IRE + 10 IRE
− 5 IRE
N EW D AT A
CRC
6bit
2008/03
[AK8825]
bit20