AK8855 Datasheet, PDF (73/81 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Decoder

[ASAHI KASEI]
AK8855
Request VBI Info Register (W) [Sub Address 0x0A]
Register to request decoding of VBLANK information such as Closed Caption Data / Extended Data / VBID
( CGMS ) / WSS Data etc.
When “1” is written to the decode request bit of each VBLANK information, the AK8855 is put into Data Decode
Ready state and waits for Data.
After decoding is completed, “1” is written to CCDET-bit / EXTDET-bit / VBWSSDET-bit which correspond to a
Status Register ( R / W ) [ Sub Address 0x10] Request, and decoded data are written to
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
bit 0 CCRQ
Closed Caption Data Decode
Request
W
bit 1 EXTRQ
Extended
Request
Data
Decode _W
bit 2 VBWSRQ
bit 3
~
Reserved
bit 7
VBID Data Decode Request W
Reserved
W
Definition
to request decoding of Closed Caption Data
0:-
1 : decode request
to request decoding of Extended Data
0:-
1 : decode request
to request decoding of VBID / WSS Data
0:-
1 : decode request
Reserved
Note )
when “1” is written to RQ-bit, CCDET-bit / EXTDET-bit / VBWSSDET-bit are cleared to “0” which correspond to
a Status Register Request.
MS0319-E-03
73
2004 / 11