AK8826VN Datasheet, PDF (96/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

■ V-Blank Interval
[AK8826VN]
The AK8826 has functions to set V-Blank Interval and to control Output Mode during the 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
bit 7
bit 6
bit 5
HDCLPLVL1 HDCLPLVL0 Reserved
bit 4
Reserved
bit 3
Reserved
bit 2
HDVUNMSK
default Value 0x04
bit 1
bit 0
HDVL1
HDVL0
V-Blank Interval Setting
525i
625i
525p
625p
1080i
720p
10
Line1 – Line18
Line264 – Line281
Line623 – Line20
Line311 – Line333
Line1 – Line40
Line621 – Line42
Line1124 – Line1125
Line1 – Line18
Line561 – Line581
Line746 – Line750
Line1 – Line23
HDVL[1:0]-bit
11
00
Line1 – Line19
Line1 – Line20
Line264 – Line282
Line264 – Line283
Line623 – Line21
Line623 – Line22
Line311 – Line334
Line311 – Line335
Line1 – Line41
Line1 – Line42
Line621 – Line43
Line621 – Line44
Line1124 – Line1125
Line1124 – Line1125
Line1 – Line19
Line1 – Line20
Line561 – Line582
Line561 – Line583
Line746 – Line750
Line746 – Line750
Line1 – Line24
Line1 – Line25
01
Line1 – Line21
Line264 – Line284
Line623 – Line23
Line311 – Line336
Line1 – Line43
Line621 – Line45
Line1124 – Line1125
Line1 – Line21
Line561 – Line584
Line746 – Line750
Line1 – Line26
The relation between B-Blank Interval and HDVUNMASK-bit are shown as following table
mode
HDVUNMSK
525i/625i mode
525p/625p mode
1080i mode
0
Blank Level output
Blank Level output
Blank Level output
during V-Blank Interval during V-Blank Interval during V-Blank Interval
720p mode
Blank Level output
during V-Blank Interval
Input data is output
even during V-Blank
Interval
Input data is output
even during V-Blank
Interval
Input data is output
even during V-Blank
Interval
Input data is output
even during V-Blank
Interval
1
(525i : Line1-9 & ( 525p : Line1-12
Line264-272
625p : Line641-5
625i : Line623-7 & are excluded )
(Line1124-1125-6 &
Line561-568
are
excluded)
(Line746-750-5
excluded )
are
Line311-318
are excluded)
MS0972-E-01
96
2008/12