AK8826VN Datasheet, PDF (38/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

[AK8826VN]
■ Closed Caption
The AK8826 has encoding function of the Closed Captioning and Extended Data.
ON/OFF control of these functions and its data are in accordance with SD/HD V-Blanking Control Register (R/W) [Sub
Address 0x12] setting. Data occupies a consecutive 2Byte Register area
Closed Caption Data 1 Register (R/W) [Sub Address 0x26]
Closed Caption Data 2 Register (R/W) [Sub Address 0x27]
for Closed Caption data and
CC Extended Data 1 Register (R/W) [Sub Address 0x28]
CC Extended Data 2 Register (R/W) [Sub Address 0x29]
for Extended data.
Data is written at 0x26/0x28(closed caption / extended data) first, then 0x27/0x29 in this order
Data is judged to be updated when data at 0x27 is written.
When data is updated, it is encoded on a coming thereafter, pre-scribed Line.
When no data updating is made, ASCII Null code is output.
Each data is assumed with ODD parity + 7 bit US ASCII code. Parity is processed at the Host side.
* Closed Caption Data is encoded on the following Lines.
D1/60 System (SMPTE)
Closed Caption
21 Line default
Extended Data
284 Line default
625/50 System (ITU-R)
22 Line default
335 Line default
RGB output mode doesn’t support closed caption encoding function.
10.5 +/- 0.25usec
12.91 usec
240+/- 48nsec
240+/- 48nsec
Two 7-bit + PARITY ASCII
Characters Data
50 +/- 2 IRE
D0-D6
D0-D6
40IRE
10.003 +/- 0.25usec
27.382 usec
61 usec
Fig. 32
33.764 usec
MS0972-E-01
38
2008/12