AK8856VN Datasheet, PDF (52/98 Pages) Asahi Kasei Microsystems – NTSC/PAL Video Decoder

ASAHI KASEI
[AK8856 Preliminary Data Sheet ]
(2) Interface by HD / VD / DVALID
In this interface mode, synchronization is determined by HD and VD. The DVALID signal is active low during
the active video space. Since even and odd field recognition can be achieved through HD and VD, interlace
information is known. The relationship of the DVALID signal and video data is illustrated here (601 output):
Video Signal
HSYNC
DVALID
CLK27MOUT
D[7:0]
Cb0 Y0 Cr0 Y1 Cb1 Y2 Cr1 Y3
Y718 Cr359 Y719
Active Video Start position
( in normal operation, it is at 123th / 133th ( NTSC / PAL ) sampling, counting f rom 0h point )(601 mode )
Timing diagram for HD / VD interface mode:
CLKOUT
HD
DVALID
DATA[7:0]
b
a
FF 00 00 SAV Cb0 Y0 Cr0 Y1 Cb1 Y2 Cr1
FF 00 00 EAV
(Data FF0000SAV & FF0000EAV are in Rec.656 mode. For modes other than Rec.656, the data are replaced
with 10H80H10H80H data)
MS0522-E-00
52
2006/Dec