ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 41

• Manufacturer Part Number: ak8823
• Description: Hdtv & Ntsc/pal Multi-format Encoder Sdtv/hdtv X2 Oversampling 5ch Dacs
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
15-3. Setting Functions of V-Blank Interval and Output Mode ( HD )
The AK8823 has functions to set V-Blank Interval and to control Output Mode during the V-Blank Interval.
V-Blank Interval is set by [ Address : 0x01 VL1 : VL0 ] – bits of [ VBI Length & Data Delay ] register ( see the following table
below ).
The Output Mode during V-Blank Interval is set by [ Address : 0x01 VUNMASK ]- bit2.
( note ) pull the input signal to the Pedestal level. So when input signal level is equal to Pedestal level, difference is not
detected.
V-Blank 期間設定
Output conditions during V-Blank Interval are set by Address : 0x01 VUNMASK-bit, as follows
MS0549-E-02
[VL1:VL0]
[VL1:VL0]
VUNMASK
mode
01
00
11
10
01
00
11
10
mode
mode
0
1
during V-Blank Interval
625i : Lines 624 ~ 5 &
Line1124 – Line1125
Line1124 – Line1125
Line1124 – Line1125
Line1124 – Line1125
even during V-Blank
( 525i : Lines 1 ~9 &
Lines 311 ~ 318 are
Input data is output
Line264 – Line284
Line264 – Line283
Line264 – Line282
Line264 – Line281
Line561 – Line584
Line561 – Line583
Line561 – Line582
Line561 – Line581
Black level output
Lines 264 ~ 272 /
525i/625i mode
Line1 – Line21
Line1 – Line20
Line1 – Line19
Line1 – Line18
Line1 – Line21
Line1 – Line20
Line1 – Line19
Line1 – Line18
1125i mode
525i mode
excluded )
Interval
( 525p : Lines 1 ~ 12 /
625p : Lines 641 ~ 5
are excluded )
during V-Blank Interval
even during V-Blank
Input data is output
Line311 – Line336
Line311 – Line335
Line311 – Line334
Line311 – Line333
Line746 – Line750
Line746 – Line750
Line746 – Line750
Line746 – Line750
Black level output
Line623 – Line23
Line623 – Line22
Line623 – Line21
Line623 – Line20
525p/625p mode
Line1 – Line26
Line1 – Line25
Line1 – Line24
Line1 – Line23
750p mode
41
625i mode
Interval
1125 ~ 6 & Lines 561 ~
during V-Blank Interval
( 1125i : Lines 1124 ~
even during V-Blank
Input data is output
(Line621 – Line45)
(Line621 – Line44)
(Line621 – Line43)
(Line621 – Line42)
568 are excluded )
525P(625p) mode
Black level output
Line1 – Line43
Line1 – Line42
Line1 – Line41
Line1 – Line40
1125i mode
Interval
during V-Blank Interval
even during V-Blank
( 750p : Lines 746 ~
Input data is output
Black level output
750 ~ 5 are
750p mode
excluded )
Interval
2006/10
[AK8823]