AK8857VQ Datasheet, PDF (60/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
Realtion between DVALID and EAV/SAV Sync
DTCLK
HD
DVALID
DATA [7:0]
FF 00 00 SAV Cb0 Y0 Cr0 Y1 Cb1 Y2 Cr1
FF 00 00 EAV
Since the AK8857 data is sampling using fixed-clock, the sample number from EAV to SAV is not
guarantee. For that reason, the default data output is in SAV format.
○EAVSAV-bit : EAV/SAV sync code is superimposed to the output data setting.
EAVSAV-bit
Status
Notes
[0]
Add
Default value
[1]
No change
[2] Interface with Timing signal
The AK8857 can output the HD signal, VD signal, HACT signal, VACT signal, DVALID signal and
FIELD signal at the output pins. Please refer to the Output Data Format setting for the correct timing
of each signal.
The space between DVALID signal is changed from low to high, and HD/HACT signals is changed
from high to low is not guarantee and for that reason the sample number for 1 line also is not
guarantee. But the space between HD/HACT signals is changed from high to low and DVALID signal
is changed from low to high, the timing is fixed.
Video Signal
HD
DVALID
HACT
····· SAV Cb0 Y0 Cr0 Y1 Cb1 Y2 Cr1 Y3 ······ Y718 Cr359 Y719 FF ··············
128CLK
244CLK
(264CLK)
1440CLK
Active video portion
32CLK
(24CLK)
Fixed space
Not fixed
MS1189-E-01
-60-
2010/12