AK8857VQ Datasheet, PDF (45/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
Input video signal categorization
The AK8857 can decode the following video signals, in accordance with the register setting.
NTSC-M,J
NTSC-4.43
PAL-B,D,G,H,I,N
PAL-Nc
PAL-M
PAL-60
SECAM
The register settings for the input signal characterization are essentially as follows.
○VSCF[1:0]-bi: Setting for subcarrier frequency of input signal
VSCF[1:0]-bit
Subcarrier frequency (MHz)
Notes
[00]
3.57954545
NTSC-M,J
[01]
3.57561149
PAL-M
[10]
3.58205625
PAL-Nc
[11]
4.43361875
PAL-B,D,G,H,I,N , NTSC-4.43 , PAL-60
SECAM*
*For SECAM input signal, set VSCF[1:0] to [11].
○VCEN[1:0]-bit: Setting for color encode format of input signal.
VCEN[1:0]-bit
[00]
[01]
Color encode format
NTSC
PAL
[10]
SECAM
[11]
Reserved
Notes
○VLF-bit : Setting for line frequency of each input frame.
VLF-bit
Number of lines
Notes
[0]
525
NTSC-M,J , NTSC-4.43 , PAL-M, PAL-60
[1]
625
PAL-B,D,G,H,I,N,Nc , SECAM
○BW-bit: Setting for decoding of input signal as monochrome signal (monochrome mode)
BW-bit
Signal type
Notes
[0]
Not monochrome (monochrome mode OFF)
[1]
Decode as monochrome signal (monochrome mode ON)
In the monochrome mode at CVBS decoding, the input signal is treated as a monochrome signal, and all
sampling data digitized the the AD converter passes through the luminance process and is processed as
a luminance signal. Thus, with this bit ON, the signal input to the Y/C separation block is all output as
luminance signal data to the luminance signal processing block.
In the monochrome mode at S-video decoding, Y signal is only decoded.
In the monochrome mode, the CbCr code is output as 0x80 (601 level data) regardless of the input.
MS1189-E-01
-45-
2010/12