ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 100

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

■ V-Blank Interval
V-Blank Interval is set by HDVL[1:0]0bit of HD VBI & Chip Level Control Register [SubAddress 0x01] .
The output mode during V-Blank Interval set by VUNMASK-bit.
HD VBI & Clip Level Control Register
Sub Address 0x01
The relation between B-Blank Interval and HDVUNMASK-bit are shown as following table
Rev-E-00
V-Blank Interval Setting
HDCLPLVL1
HDVUNMSK
The AK8825 has functions to set V-Blank Interval and to control Output Mode during the V-Blank Interval.
1080i
525p
625p
720p
525i
625i
bit 7
mode
0
1
Line1124 – Line1125
HDCLPLVL0
Line264 – Line281
Line311 – Line333
Line561 – Line581
Line746 – Line750
Line623 – Line20
Line621 – Line42
Line1 – Line18
Line1 – Line40
Line1 – Line18
Line1 – Line23
bit 6
10
Input data is output
even during V-Blank
Interval
Line264-272
625i
Line311-318
are excluded)
during V-Blank Interval
(525i
Blank Level output
525i/625i mode
:
:
Reserved
Line623-7
bit 5
Line1-9
Line1124 – Line1125
Line264 – Line282
Line311 – Line334
Line561 – Line582
Line746 – Line750
Line623 – Line21
Line621 – Line43
&
&
Line1 – Line19
Line1 – Line41
Line1 – Line19
Line1 – Line24
Reserved
Input data is output
even during V-Blank
Interval
( 525p : Line1-12
625p : Line641-5
are excluded )
during V-Blank Interval
bit 4
Blank Level output
11
525p/625p mode
100
HDVL[1:0]-bit
Reserved
bit 3
Line1124 – Line1125
Line264 – Line283
Line311 – Line335
Line561 – Line583
Line746 – Line750
Line623 – Line22
Line621 – Line44
Line1 – Line20
Line1 – Line42
Line1 – Line20
Line1 – Line25
Input data is output
even during V-Blank
Interval
Line561-568
excluded)
during V-Blank Interval
(Line1124-1125-6
Blank Level output
HDVUNMSK
00
1080i mode
bit 2
are
HDVL1
&
bit 1
Line1124 – Line1125
Input data is output
even during V-Blank
Interval
(Line746-750-5
excluded )
during V-Blank Interval
Line264 – Line284
Line311 – Line336
Line561 – Line584
Line746 – Line750
Line623 – Line23
Line621 – Line45
Blank Level output
Line1 – Line21
Line1 – Line43
Line1 – Line21
Line1 – Line26
default Value 0x04
720p mode
01
HDVL0
bit 0
2008/03
[AK8825]
are