AK8856VN Datasheet, PDF (39/98 Pages) Asahi Kasei Microsystems – NTSC/PAL Video Decoder

ASAHI KASEI
[AK8856VN]
Output Interface
The AK8856 supports 3 types of interfaces:
(1) Camera interface (QVGA / CIF / QCIF)
(2) Interface by HD / VD / DVALID (VGA / QVGA / CIF / QCIF)
(3) 656 Interface (601 specification compatible size (720 X 480))
(1) Camera Interface
There are two types of data interfaces: “(1-1) HV & VAF Interface Mode“ and “(1-2) SAV / EAV Interface Mode“.
In this mode, since synchronization shift with the input signal is adjusted at the head part of the line, the interval
between lines may fluctuate to some degree. When an exceptional input signal is decoded, there may be cases
where the lack of number of lines and lack of number of pixels per line occur, regardless of operation mode. At
the default value, an end of frame is set at the rising edge of the VAF signal, and an end of line is set by the HV
signal. The polarity of VAF / HV / DVALID / CLKO is programmable through the Output Control 2 Register
(R/W) [Sub Address (0x02)].
The following timing diagrams show operation examples at HDP = 0, VDP = 0, DVALDP = 0, and CLKINV = 1
settings.
Since the output is progressive in Camera Interface mode, picture sizes in this mode are QVGA / CIF / QCIF /
rotated QVGA / rotated CIF.
Definition of SAV / EAV Interface Mode:
Active
VBlank
SAV
0x80
0xAB
EAV
0x9D
0xB6
In SAV / EAV output mode, HV / VAF signal is not output by default. The register must be set for this mode.
MS0522-E-00
39
2006/Dec