AK8856 Datasheet, PDF (78/105 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Decoder

ASAHI KASEI
[ AK8856 ]
(4) Field Signal Output
The field signal can be output on VD / VAF /FIELD signal output pin. Output signal selection between VD / VAF signal and
FIELD signal is done by Control 1 Register (Sub Address 0x03).
Pin output and Field relation:
FIELD Signal State
Low
High
Field Information
Odd
Even
The value of the Field signal is determined during DVALID active. The Field signal does not directly reflect the
input field, but it is a field signal which is forced to toggle at each VSYNC signal. Therefore, even when Odd
Field or Even Field only signal is input, the Field signal also toggles.
Switching Timing between Field signal and VD signal:
NTSC
525
1
2
3
4
5
6
7
8
9
10
Digital
Line-No.
HD
VD
FIELD
Digital
262
263
264
265
266
267
268
269
270
271
272
Line-No.
HD
VD
FIELD
PAL
622
623
624
625
1
2
3
4
5
6
7
Digital
Line-No.
HD
VD
FIELD
Rev-01
78
2007/03