AK8854VQ Datasheet, PDF (42/95 Pages) Asahi Kasei Microsystems – Multi-Format Digital Video Decoder

[AK8854VQ]
TRSVSEL-bit: Settings for V-bit handling in ITU-R BT.656 format
TRSVSEL-bit
525-line
V-bit=0
V-bit=1
625-line
V-bit=0
V-bit=1
[0]
ITU-R BT 656-3
compliant
[1]
ITU-R BT 656-4
Line10~Line263
Line273~Line525
Line20~Line263
Line1~Line9
Line264~Line272
Line1~Line19
Line23~Line310
Line336~Line623
Line1~Line22
Line311~Line335
Line624~Line625
SMPTE125M
Line283~Line525 Line264~Line282
compliant
These values are unaffected by the VBIL[2:0]-bits setting.
SLLVL-bit: Settings for slice level
SLLVL-bit
Slice level
[0]
25IRE
[1]
50IRE
The results of VBI slicing by the AK8854 slicing function are output as ITU-R BT.601 digital data. The
VBI interval is set via VBIL[2:0]-bits. VBI slicing is performed in the luminance signal processing path,
so that the Cb/Cr value of the effective line 601 output code is output at the same level as the
corresponding luminance signal.
The slice level and the output code are set via the register. The output code value is set via the Hi/Low
Slice Data Set Register, as follows.
Hi Slice Data Set Register*: Setting for higher of two values resulting from slicing.
Default: 0xEB(235)
Low Slice Data Set Register*: Setting for lower of two values resulting from slicing.
Default: 0x10(16)
*Note that a setting of 0x00 or 0xFF corresponds to a special 601 code.
VBIDEC[1:0]-bits: Settings for decode data in the VBI period
VBIDEC[1:0]-bits
Decode data
Notes
[00]
Black level output
Y = 0x10
Cb/Cr = 0x80
[01]
Monochrome mode
Y = data converted to 601 level
Cb/Cr = 0x80
[10]
Sliced data output during VBI
Y/Cb/Cr = value corresponding to slice level
(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.
MS0973-E-01
42
2008/07