AK8851 Datasheet, PDF (45/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
[AK8851]
(2) Interface by DVALID Signal
When the ITU-R BT.656 interface is not available, the AK8851 can output data by the DVALID signal that becomes valid
during the Active Video interval.
DVALID signal and data output relation is shown in the following timing diagram.
* DVALID Signal Timing
DVALID signal timing to indicate Active Video interval is shown.
Video Signal
HSYNC
DVALID
CLK27MOUT
D[7:0]
Cb0 Y0 Cr0 Y1 Cb1 Y2 Cr1 Y3
Start position of Active Video
(Normally, 123rd/133rd(NTSC/PAL) sample from 0H sample)
Y718 Cr359 Y719
(3) Output Mode
(3-1) 8-Bit Output Mode (default )
Output timing of D[7:0] and HALFCKO is as follows. HALFCKO functions as reference signal of Luminance and Color
data.
CLK27MOUT
HALFCKO
D[7:0]
Cb0 Y0 Cr0 Y1 Cb1 Y2 Cr1 Y3
Y718 Cr359 Y719
(3-2) 16-Bit Output Mode
The AK8851 can output data in 16-Bit format by setting a register.
The register is [16BITOUT]-bit of [Control 1 Register](R/W)[Sub Address 0x08].
Output timing is as follows.
HALFCLKOUT
D[7:0]
EXTData[7:0]
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
Cb0 Cr0 Cb1 Cr1 Cb2 Cr2 Cb3 Cr3
Y718 Y719
Cb359 Cr359
MS0244-E-03
45
Confidential
2005 / 07