AK8813 Datasheet, PDF (22/51 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHIKASEI
[AK8813/14]
♦ Video ID
AK8813/14 supports Video ID (EIAJ standard, CPR-1204) encoding for the distinction of an aspect ratio
or CGMS-A etc. Setting or Resetting the VBID-bit of [ Video Process 2 Register(02H) ], this function is
switched On/Off. The data is set by using [ Video ID Data Register(1AH, 1BH) ].
VBID Data Renewal Timing.
VSYNC
I²C SDA
Set C ontrol R egister
NEW DATA
DATA
OLD DATA
NEW DATA
Fig. 5 VBID Data renewal Timing
VBID Data Layout
VBID is consists of 20 bits and its format is shown as follows.
AK8813/14 generates CRC code automatically and appends it to the data. Initial value of the
Polynomial is 1.
DATA bit1
WORD0
2bit
WORD1
4bit
WORD2
8bit
Fig. 6 VBID code assignment
bit20
CRC
6bit
Rev.00
- 23 -
2004/Oct