ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 48

• Manufacturer Part Number: ak8823
• Description: Hdtv & Ntsc/pal Multi-format Encoder Sdtv/hdtv X2 Oversampling 5ch Dacs
• Manufacturer: AKM Semiconductor, Inc.

DATA
ASAHI KASEI
16-3. Video ID ( SD )
The AK8823 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 VBID bit of { Video Process 2 Register ( 12H )} and setting data is set at
{ Video ID Data Register ( 2AH, 2BH )}.
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 ).
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 AK8823.
Default values of “CRC Polynomial Expression X6 + X + 1” are all ones.
VBID Signal Waveform
MS0549-E-02
V S Y N C
I
D A T A
2
C S D A
bit1
WORD0
2bit
11.2usec +/- 0.3usec
Decode line
Amplitude
WORD1
4bit
Ref.
2.235usec +/- 50nsec
bit1 bit2 bit3
1H
49.1usec +/- 0.3usec
S et C ontro l R egister
N EW D AT A
525/60 System
O LD D A T A
20/283
70IRE
48
WORD2
•••
8bit
bit20
70IRE +/- 10IRE
0IRE
+ 10 IRE
− 5 IRE
625/50 System
490mV
20/333
N EW D AT A
CRC
6bit
2006/10
[AK8823]
bit20