AK8856VN Datasheet, PDF (89/98 Pages) Asahi Kasei Microsystems – NTSC/PAL Video Decoder

ASAHI KASEI
[AK8856 Preliminary Data Sheet]
Request VBI Info Register (W) [Sub Address 0x0A]
This register is used to decode VBLANK information, including Closed Caption Data, Extended Data, VBID
(CGMS), and WSS Data.
When a “1” is written to the decode request bit for VBLANK information, the AK8856 is put into Data Decode
Ready state and waits for Data. After decoding is completed, a “1” is written to the CCDET bit, the EXTDET bit,
and the VBWSSDET bit. These bits correspond to a Status Register ( R / W ) [ Sub Address 0x10] request,
and decoded data are written to the Closed Caption Data 1 / 2 Registers, Extended Data 1 / 2 Registers and
VBID / WSS Data 1/ 2 Registers respectively.
Sub Address 0x0A
bit 7
bit 6
Reserved
Reserved
0
0
bit 5
Reserved
0
bit 4
bit 3
Reserved
Reserved
Default Value
0
0
bit 2
VBWSRQ
0
Default Value: 0x00
bit 1
bit 0
EXTRQ
CCRQ
0
0
Request VBI Info Register Definition
BIT Register Name
R/W
Definition
Request decoding of Closed Caption Data
bit 0
CCRQ
Closed Caption Data Decode
Request
W
0:-
1 : decode request
Extended Data Decode
Request decoding of Extended Data
bit 1
EXTRQ
Request
W 0:-
1 : decode request
Request decoding of VBID / WSS Data
bit 2
VBWSRQ
VBID Data Decode Request
W 0:-
1 : decode request
bit 3
~
Reserved
Reserved
W Reserved
bit 7
Note) When a “1” is written to the RQ-bit, CCDET, EXTDET, and VBWSSDET bits are cleared to “0”, which corresponds to a
Status Register Request.
MS0522-E-00
89
2006/Dec