AK8851 Datasheet, PDF (55/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
Output Format Register (R/W) [Sub Address 0x02]
Register to set the format of output data. The following contents are pre-settable
* Vertical Blanking Interval
* Upper / Lower limits of 601 data
* handling of output if ITU-R BT.656 output is not available
* V-bit set of EAV / SAV
* task-handling during VBI interval
Sub Address 0x02
bit 7
bit 6
VBIDEC1
VBIDEC0
0
0
bit 5
SLLVL
0
bit 4
bit 3
TRSVSEL 601LIMIT
Default Value
0
0
bit 2
VBIL2
0
[AK8851]
Default Value : 0x00
bit 1
bit 0
VBIL1
VBIL0
0
0
Output Format Register Definition
BIT Register Name
R/W Definition
Set the Vertical Blanking Interval
Default setting is
525-system : Line1~19/Line263.5~282.5
625-system : Line623.5~22/Line311~335.5
bit 0
VBIL0
~
~
Vertical Blanking Length
bit 2
VBIL2
bit 3 601LIMIT 601 Output Limit
bit 4 TRSVSEL
Time Reference Signal V
Select bit
This register sets the difference to the default value.
See “21. Vertical Blanking Interval”
R/W VBIL2:VBIL0] =
000 : default
001 : VBI interval becomes 1line longer
010 : VBI interval becomes 2lines longer
011 : VBI interval becomes 3lines longer
111 : VBI interval becomes 1line shorter
110 : VBI interval becomes 2lines shorter
101 : VBI interval becomes 3lines shorter
100 : VBI interval becomes 4lines shorter
This bit specifies Min. and Max. values of output data.
R/W 0 : 1-254 (Y/Cb/Cr)
1 : 16-235 (Y) / 16-240 (Cb/Cr)
TRSVSEL-bit is a control bit to specify handling of
V-bit in Rec.656 EAV/SAV code.
NTSC (525)
TRSVSEL=0 :
Line1~Line9/Line264~Line272 V-bit=1
Line10~Line263/Line272~Line525V-bit=0
TRSVSEL=1:
R/W Line1~Line19/Line264~Line282 V-bit=1
Line20~Line263/Line283~Line525 V-bit=0
bit 5
SLLVL
Slice Level
bit 6 VBIDEC0
~
~
VBI Decode
bit 7 VIBDEC1
PAL(625System)
Always
Line1~Line22/Line311~Line335/Line624~Line625
V-bit =1
Line23~Line310/Line336~Line623 V-bit=0
Set the sliced level
R/W 0 : Slice level is 25 IRE
1 : Slice level is 50 IRE
Output data between VBI intervals.
VBIDEC1:VBIDEC0
00 : Black level data is output
R/W _{01 : Black and White data is output}
10 : Sliced result is output
11 : Reserved
MS0244-E-03
55
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2005 / 07