ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 45

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

ASAHI KASEI
[AK8823]
15-10. Closed Caption(HD)
The AK8823 has encoding functions of the Closed Captioning and Extended Data.
ON / OFF control of these functions and its data are in accordance with { Video Process 2 Register ( 12H ) } setting for SD side.
As for the HD side, HD side Output can be disabled by setting Bit 3, CC_DIS at Address 0x01.
Since Closed Caption function is shared with SD side, it functions properly only when Video Data is received from SD port.
Each Data occupies a consecutive 2 Byte Register area { Closed Caption R ( 26H, 27H )}.
Data is written at 26H first, then 27H in this order.
Data is judged to be updated when data at 27H 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)
625/50 System (ITU-R)
Closed Caption
21 Line default
22 Line default
Extended Data
284 Line default
335 Line default
240+/- 48nsec
240+/- 48nsec
10.5 +/- 0.25usec
12.91 usec
Two 7-bit + PARITY ASCII
Characters Data
D0-D6
D0-D6
50 +/- 2 IRE
40IRE
10.003 +/- 0.25usec
27.382 usec
33.764 usec
61 usec
MS0549-E-02
45
2006/10