ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 42

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

■ Closed Caption
Address 0x12] setting. Data occupies a consecutive 2Byte Register area
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.
RGB output mode doesn’t support closed caption encoding function.
Rev-E-00
for Closed Caption data and
for Extended data.
50 +/- 2 IRE
The AK8825 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
Closed Caption
Extended Data
40IRE
Closed Caption Data 1 Register (R/W) [Sub Address 0x26]
Closed Caption Data 2 Register (R/W) [Sub Address 0x27]
CC Extended Data 1 Register (R/W) [Sub Address 0x28]
CC Extended Data 2 Register (R/W) [Sub Address 0x29]
10.003 +/- 0.25usec
10.5 +/- 0.25usec
D1/60 System (SMPTE)
284 Line default
21 Line default
27.382 usec
12.91 usec
Fig. 33
42
625/50 System (ITU-R)
61 usec
240+/- 48nsec
335 Line default
22 Line default
Two 7-bit + PARITY ASCII
D0-D6
Characters Data
33.764 usec
D0-D6
240+/- 48nsec
2008/03
[AK8825]