AK8851 Datasheet, PDF (16/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
[Input Video Standard Register](R/W)[Sub Address 0x01]:
This register sets the input signal attributes.
its Bit Allocation is as follows.
Sub Address 0x01
bit 7
bit 6
bit 5
AUTODET
SETUP
B/W
0
0
0
bit 4
bit 3
VLF
VCEN1
Default Value
0
0
bit 2
VCEN0
0
[AK8851]
Default Value : 0x00
bit 1
bit 0
VSCF1
VSCF0
0
0
* [VSCF1:VSCF0]-bit:
Input signal Sub-carrier frequency is set using the [VSCF1:VSCF0]-bit.
[VSCF1:VSCF0]
Sub-Carrier Freq.[MHz]
Note
[00]
3.57954545
NTSC
[01]
3.57561188
PAL-M
[10]
3.582054
PAL-N(Arg.)
[11]
4.43361875
PAL-B,D,G,H,I
* [VCEN1:VCEN0]-bit:
Input signal Color encoding is set using the [VCEN1:VCEN0]-bit.
[VCEN1:VCEN0]-bit
Color Encode Type
00
NTSC
01
PAL
10
SECAM
11
Reserved
Note
*[VLF]-bit:
Number of input signal Lines per Frame is set using the [VLF]-bit.
[VLF]-bit
Number of Lines
0
525 lines
1
625 lines
Note
*[B/W]-bit:
When the input signal is Black and White, set the [B/W]-bit.
[B/W]-bit
Type of Signal
Note
0
Color Signal
1
Black and White Signal
(footnote)
When this bit is set, the input signal is processed as a Black and White signal and the digitized sampling data through the
ADC is processed as Luminance through Luminance process. Namely, when this bit is ON, all input signals fed to the Y/C
separation block are treated as Luminance, and the data is output to the Luminance signal-processing block from Y/C
Separation block.
*[SETUP]-bit:
Lack or presence of input signal SETUP features is set by [SETUP]-bit.
[SETUP]-bit
SETUP
Note
0
w/o Setup Signal
1
with Setup Signal
7.5% SETUP
(footnote)
when [SETUP]-bit is set to “1”,Luminance and Chroma signals are processed as follows.
Luminance signal: Y=Y(1-0.075)/0.925
Chroma signal : U=U/0.925
V=V/0.925
MS0244-E-03
16
Confidential
2005 / 07