AK8825 Datasheet, PDF (129/162 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

HD VBI & Clip Level Control Register (R/W) [Sub Address 0x01]
[Component Video Encoder]
VBI, Clipping level of output is set.
Sub Address 0x01
bit 7
bit 6
HDCLPLVL1 HDCLPLVL0
0
0
bit 5
Reserved
0
bit 4
bit 3
Reserved
Reserved
Default Value
0
0
bit 2
HDVUNMSK
1
[AK8825]
default Value 0x04
bit 1
bit 0
HDVL1
HDVL0
0
0
HD VBI & Clip Level Control Register (R/W) [Sub Address 0x01]
BIT Register Name
R/W
Definition
Adjust VBI blanking lines.
Final lines of the blanking period are adjusted. Values are relative
bit 0
HDVL0
~
~
bit 1
HDVL1
HD VB Setting
number of the default line (line 20).
R/W ^{[HDVL1:HDVL0]-bit}
01:increased by 1 line
00: default
11: decreased by 1 line.
10: decreased by 2 lines.
Sets the masking action during V-Blanking periods.
0 : during V-Blanking outputs are masked.（Black is outputs）
1: normal operation. (Input data is output during V-Blanking
periods.)
bit 2 HDVUNMSK
V-Blank Unmask bit
R/W
Following lines are in the interest.
525i : 10 - 20(+/-VL[1:0]) and
273- 283(+/-VL[1:0]) Line
525P : 13 - 42(+/-VL[1:0]) Line
1080i : 7 - 20(+/-VL[1:0]) line and
569 - 583(+/-VL[1:0]) line
720P : 6 - 24(+/-VL[1:0]) lien
bit 3
~
Reserved
bit 5
Reserved bit
R/W Reserved, write 0x00
bit 6 HDCLPLVL0
~
~
bit 7 HDCLPLVL1
HD Clamp Level bit
Define clipping level of the over sampling filter.
[HDCLPLVL1:HDCLPLVL0] =
R/W ^{00:no clipping}
01: clips at about -7.0 IRE below pedestal level.
10: clips at about -1.5 IRE below pedestal level.
11:Reserved
Rev-E-00
129
2008/03