ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 49

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

ASAHI KASEI
16-4. WSS Function ( SD )
The AK8823 supports to encode the WSS ( ITU-R BT.1119 ) which distinguishes the Aspect Ratio etc..
Turning “ ON / OFF “ of this function is controlled by WSS bit of { Video Process 2 Register ( 12H )}, and setting data is set at
{ WSS Data Register ( 0x18, 0x19 )}.
WSS Data Up-date Timing
WSS Waveform
Encode Line : former half of Line 23
( note ) When to stop Video output at the latter half line, Blanking should be made at Line23.
Coding
Clock
Encoding details are listed in the follow table.
MS0549-E-02
V S Y N C
I
D A T A
0x1F1C71C7
2
29 elements
C S D A
Run-in
0
H
: Bi-Phase Modulation coding
1.5usec
: 5 MHz ( Ts = 200 ns )
11.0 +/- 0.25usec
500mV +/- 5%
10.5usec
24 elements
0x1E3C1F
Start code
Bit numbering
0
LSB
0 : 000111
1 : 111000
24 elements
Aspect ratio
1
S et C ontro l R egister
Group 1
27.4usec
38.4usec
44.5usec
N EW D AT A
2
O LD D A T A
MSB
3
49
Bit numbering
4
LSB
0 : 000111
1 : 111000
24 elements
Enhanced
5
Services
Group 2
6
MSB
7
Bit numbering
8
LSB
0 : 000111
1 : 111000
18 elements
9
Subtitles
Group 3
10
MSB
N EW D AT A
Bit numbering
11
LSB
0 : 000111
1 : 111000
Group4 Reserved
18 elements
12
2006/10
[AK8823]
MSB
13