AK8851 Datasheet, PDF (70/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
Request VBI Info Register (R/W) [Sub Address 0x15]
[AK8851]
This Register requests VBLANK decode information such as Closed Caption data/Extended data/ VBID (CGMS)/WSS data.
When “1” is written into each decode request bit of VBLANK information register, the AK8851 is put into a
Data-Decode-Ready state and waits for data. When the decoding of data is completed, ”1” is written into each bit of Status
Register2 and the decoded data are stored in the following registers respectively.
* Closed Caption Data 1 and2 Registers
* Extended Data 1 and 2 Registers
* VBID Data 1 and 2 Registers
* WSS Data 1 and 2 Registers
Sub Address 0x15
bit 7
bit 6
Reserved
Reserved
0
0
bit 5
Reserved
0
bit 4
bit 3
Reserved
WSSRQ
Default Value
0
0
bit 2
VBIDRQ
0
Default Value : 0x00
bit 1
bit 0
EXTRQ
CCRQ
0
0
Request VBI Info Register Definition
BIT Register Name
R/W Definition
Decode request for Closed Caption Data
bit 0
CCRQ
Closed Caption Decode Request R/W 0 :
1 : Request to decode
Decode request for Extended Data0 :
bit 1
EXTRQ
Extended Data Decode Request R/W 0 :
1 : Request to decode
Decode request for VBID Data
bit 2
VBIDRQ
VBID Data Decode Request
R/W 0 :
1 : Request to decode
Decode request for WSS Data
bit 3
WSSRQ
WSS Data Decode Request
R/W 0 :
1 : Request to decode
bit 4
~
Reserved Reserved
R/W Reserved
bit 5
MS0244-E-03
70
Confidential
2005 / 07