AK8857VQ Datasheet, PDF (51/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
○VBIDEC[1:0]-bit: Settings for decode data in the VBI period
VBIDEC[1:0]-bit Decode data
Notes
[00]
Black level output
Y = 0x10
Cb/Cr = 0x80
Y = data converted to 601 level
[01]
Monochrome mode
Cb/Cr = 0x80
Sliced data output
Y/Cb/Cr = value corresponding to slice level
[10]
during VBI
(Value set at Hi/Low Slice Data Set Register)
[11]
Reserved
Reserved
Note that, with VBI period settings of Lines 1~9 and 263.5~272.5 in the 525 Line and Lines 623.5~6.5
and 311~318 in the 625 Line, the setting VBIDEC[1:0] will not be entered and the output will be in
Black level code.
(mV*)
NTSC/PAL
601 Code
714/700 235
100% White
357/350 127
180/175 ⁶³
50IRE threshold with
setting SLLVL = [1]
25IRE threshold with
setting SLLVL = [0]
L L _{````</sub> L L H H <sub>````} H H
`````
Cb/Y <sub>``````</sub> Cr/Y
Cb/Y <sub>``````</sub> Cr/Y
*Threshold values (mV) are approximate.
L: <sup>Value set by Low Slice</sup>
Data Set Register
H: <sup>Value set by High Slice</sup>
L
Data Set Register
```````
High/Low conversion is performed for either the Cb/Y or the Cr/Y combination. The above figure
is an example of the conversion points for Cb/Y.
MS1189-E-01
-51-
2010/12