AK8850 Datasheet, PDF (86/99 Pages) Asahi Kasei Microsystems – NTSC Digital Video Decoder

ASAHI KASEI
[AK8850]
REQUEST VBI INFO REGISTER ( W ) [ SUB ADDRESS : 0x1F ]
This register controls VBI operations, including Closed- Caption, Extended data, VBID and WSS.
The AK8850 is put into a wait condition for each data when “ 1 “ is written into each bit.
When the decoding is completed, “ 1” is written into each bit of the [ STATUS 2 REGISTER ] and the decoded data are
stored in the Closed-Caption Data1 / Data2,CCEXTENDED Data1 / Data2,VBID Data1 / Data2 and WSS Data1 / Data2
registers respectively.
Sub Address 0x1F
bit 7
bit 6
Reserved Reserved
0
0
bit 5
Reserved
0
bit 4
bit 3
WSSRQ
VBIDRQ
Default Value
0
0
bit 2
EXTRQ
0
bit 1
CCRQ
0
bit 0
ASPECTRQ
0
Request VBI Info Register Definition
BIT Register Name
bit 0 ASPECTRQ ASPECT Request bit
bit 1
CCRQ
Closed Caption Request bit
bit 2
EXTRQ
Extended Data Request bit
bit 3
VBIDRQ
VBID Request bit
bit 4
WSSRQ
WSS Request bit
bit 5
Reserved Reserved bit
bit 7
R/W Definition
Request to decode ASPECT Signal
W 0:
1 : Request
Request to decode Closed Caption data
W 0:
1 : Request
Request to decode Extended data
W 0:
1 : Request
Request to decode VBID data
W 0:
1 : Request
Request to decode WSS data
W 0:
1 : Request
W Reserved bit
Rev.0
86
2003/01