ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 50
ak8823
Manufacturer Part Number
ak8823
Description
Hdtv & Ntsc/pal Multi-format Encoder Sdtv/hdtv X2 Oversampling 5ch Dacs
Manufacturer
AKM Semiconductor, Inc.
Datasheet
1.AK8823.pdf
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ASAHI KASEI
16-5. Slave Mode ( SD )
HSYNC and FID or VSYNC ( selectable by register setting ) timing signals are input when the AK8823 is in Slave mode
operation.
In Slave mode, the AK8823 checks transition change of HSYNC at the rise timing of SYSCLK ( refer to AC Characteristics ).
Rise timing of SYSCLK right after HSYNC changes to low, is recognized to be the 32
276
Video Field is recognized with FID / VSYNC relation with HSYNC ( refer to Video Field Recognition diagram below ).
As shown in the diagram, its relation allows +/_ 1/4 H time margin respectively.
Field Recognition is made in the following timing.
MS0549-E-02
HSYNC
27MHz
th
start of 2
Start of 1
Data
HSYNC
( 288
VSYNC
VSYNC
th
nd
st
) Data is captured as Cb Data.
field
field
244T / 264T (525/625)
1/4 H
1/4 H
1/2 H
1/4 H 1/4 H
1/2 H
Field Recognition
50
Cb
0
Y
0
Cr
0
Y
1
nd
( 24
Cb
th
1
) data in Video Stream, and the
Y
2
Cr
1
2006/10
[AK8823]
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