AK8858 Datasheet, PDF (27/96 Pages) Asahi Kasei Microsystems – PS/SD Multi Format Video Decoder

[AK8858]
[7.5] Input video signal categorization
Set the input video signal.
Composite (CVBS) video signal, S-Video signal, and Component video signal can be select via register Input
Channel Select Register (R/W) [Sub Address 0x00].
When decode composite (CVBS) video signal and S-Video signal, it is necessary to set subcarrier frequency,
color encode format, line frequency, and Setup ON/OFF of input signal via register Input Video Standard
Register (R/W) [Sub Address 0x04].
When decode component video signal, it is necessary to set line frequency and Setup ON/OFF. It is also
necessary to set sync signal and signal ratio of input video signal via register Miscellaneous Setting Register
(R/W) [Sub Address 0x03].
Sub Address: 0x04
bit 7
bit 6
AUTODET
SETUP
Default Value
0
0
bit 5 bit 4 bit 3
BW
VLF
VCEN1
0
0
0
bit 2
VCEN0
0
Default Value:0x00
bit 1
bit 0
VSCF1
VCSF0
0
0
Sub Address: 0x03
bit 7
bit 6
Reserved Reserved
Default Value
0
0
bit 5
Reserved
0
bit 4
Reserved
0
bit 3
Reserved
0
bit 2
CSCL
0
Default Value: 0x00
bit 1
bit 0
CSSL Reserved
0
0
VCSF[1:0]-bit: Setting for subcarrier frequency of input signal.
Setting
00
01
10
11
Subcarrier frequency
3.57954545 MHz
3.57561149 MHz
3.58205625 MHz
4.43361875 MHz
Formats
NTSC
PAL-M
PAN-Nc
PAL-B,D,G,H,I,N, NTSC-4.43, PAL60, SECAM*
*For SECAM input signal, set VCSF[1:0] to 11.
For component video signal input, VCSF[1:0] setting is not necessary.
VCEN[1:0]-bit: Setting for color encode format of input signal.
Setting
Color encode format
Notes
00
NTSC
01
PAL
10
SECAM
In case of YPbPr, SECAM is prohibited.
11
Reserved
For component video signal input, VCEN[1:0] setting is not necessary.
VLF-bit: Setting for line frequency of each input frame.
Setting
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)
Setting
0
1
Signal type
Not monochrome (monochrome mode OFF)
Decode as monochrome signal (monochrome mode ON)
Notes
In the monochrome mode (BW=1), the input signal is treated as a monochrome signal, and all sampling data
digitized the AD converter passes through the luminance process and is processed as luminance signal, and
the CbCr code is output as 0x80 regardless of the input.
MS1230-E-00
- 27 -
2010/9