AK8854VQ Datasheet, PDF (32/95 Pages) Asahi Kasei Microsystems – Multi-Format Digital Video Decoder

[AK8854VQ]
7.3 Input video signal categorization
[CVBS and S-video signal decoding]
The AK8854 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
In auto detection mode, it automatically recognizes the input signal category, from among the above.
The register settings for the input signal characterization are essentially as follows.
VSCF[1:0]-bits: Setting for subcarrier frequency of input signal.
VSCF[1:0]-bits
Subcarrier frequency (MHz)
[00]
3.57954545
[01]
3.57561149
[10]
3.58205625
[11]
4.43361875
*For SECAM input signal, set VSCF[1:0] to [11].
Formats
NTSC-M,J
PAL-M
PAL-Nc
PAL-B, D, G, H, I, N, NTSC-4.43,
PAL-60, SECAM*
VCEN[1:0]-bits: Setting for color encode format of input signal.
VCEN[1:0]-bits
Color encode format
Notes
[00]
NTSC
[01]
PAL
[10]
SECAM
*
[11]
Reserved
*In case of YPbPr and RGB, SECAM is prohibited.
VLF-bit: Setting for line frequency of each input frame.
VLF-bit
Number of lines
[0]
525
[1]
625
Notes
NTSC-M, J, NTSC-4.43, PAL-M, PAL-60
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.
MS0973-E-01
32
2008/07