AK8811_12 Datasheet, PDF (19/36 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
[AK8811/12]
♦ Video ID
AK8811/12 supports Video ID (EIAJ standard, CPR-1204) encoding for the distinction of an
aspect ratio, 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
SI/SDA
Data #1
Set Control Register
NEW 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.
AK8811/12 generates CRC code automatically and appends it to the data. Initial value of
the Polynomial is 1.
bit 1
DATA
WORD 0
2 bit
WORD 1
4 bit
WORD 2
8 bit
bit 20
CRC
6 bit
Fig. 6 VBID code assignment
Rev.1.1
19
2000/01