AK8826VN Datasheet, PDF (100/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

■ Video ID (CEA-805-A / CEA-805-B)
The AK8826 has a function to super impose a Copy Protect Information CGMS-A on output signal.
The AK8826 supports both of CEA-805-A and CEA-805-B standards.
(1) CEA-805-A
[AK8826VN]
700mV
70%
Ref
bit1 bit2 bit3
H : White Peak (70+/- 10)%
bit20
0H
L : 0 (+10 / - 5) %
0
a
-300mV
b
c
Fig. 145
a
b
c
Line
525i*
(480i)
11.2 +/- 0.3usec
(time from 0H)
2.235 +/- 50nsec
49.1 +/- 0.44usec
Line 20
Line 283
525P*
(480P)
6T (5.8 +/- 0.15usec)
(time from 0H)
T +/- 30nsec
22T
(21.2 +/- 0.22usec)
T : 1/(f_H x 33)
= 963nsec
Line 41
1080i
4T
( 4.15 +/- 0.16usec)
T +/- 30nsec
22T
T : 1/(f_H x 2200/77) Line 19
( 22.84 +/- 0.21usec)
= 1.038usec
Line 582
720P
4T
(3.13 +/- 0.09usec)
T +/- 30nsec
22T
T : 1/(f_H x 1650/58)
(17.20+/- 0.16usec)
= 0.782usec
Line 24
* SYNC signal waveform of 525i/p signals differ from the above, but timing is defined based on 0H point as starting point (time
from 0H).
bit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Data
WORD 0
2bits
WORD 1
4bits
WORD 2
8bits
CRCC
6bits
20 bit data is configured with WROD 0: 2bits / WROD 1: 4 bits / WORD 2: 8 bits / CRCC: 6 bits, as shown above.
When to set CGMS-A data, set HDVBIDEN-bit of HD VBID Data 1 Register [SubAddress 0x03] to “1”, and write a setting
value to HD VBID Data 1/2 Register[SubAddress 0x03/0x04].
HD VBID Data 1 Register
Address 0x03
bit 7
bit 6
HDVBIDEN Reserved
bit 5
HDVBID1
bit 4
HDVBID2
bit 3
HDVBID3
bit 2
HDVBID4
Default Value 0x00
bit 1
bit 0
HDVBID5
HDVBID6
HD VBID Data 2 Register
Address 0x04
bit 7
bit 6
HDVBID7
HDVBID8
bit 5
HDVBID9
bit 4
HDVBID10
bit 3
HDVBID11
bit 2
HDVBID12
Default Value 0x00
bit 1
bit 0
HDVBID13 HDVBID14
MS0972-E-01
100
2008/12