ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 104

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

■ Video ID (CEA-805-A / CEA-805-B)
The AK8825 has a function to super impose a Copy Protect Information CGMS-A on output signal.
The AK8825 supports both of CEA-805-A and CEA-805-B standards.
(1) CEA-805-A
* 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).
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
HD VBID Data 2 Register
Address 0x04
Rev-E-00
Data
HDVBIDEN
bit
HDVBID7
70%
(480P)
0
-300mV
525P*
(480i)
1080i
525i*
720P
bit 7
bit 7
700mV
WORD 0
1
2bits
6T (5.8 +/- 0.15usec)
2
( 4.15 +/- 0.16usec)
(3.13 +/- 0.09usec)
11.2 +/- 0.3usec
Reserved
HDVBID8
(time from 0H)
(time from 0H)
0
bit 6
bit 6
H
3
4T
4T
a
WORD 1
4
4bits
a
5
HDVBID1
HDVBID9
bit 5
bit 5
6
2.235 +/- 50nsec
T +/- 30nsec
T +/- 30nsec
T +/- 30nsec
Ref
7
b
HDVBID10
HDVBID2
8
bit 4
bit 4
9
bit1
Fig. 146
104
b
WORD 2
10
( 22.84 +/- 0.21usec)
(17.20+/- 0.16usec)
(21.2 +/- 0.22usec)
8bits
49.1 +/- 0.44usec
bit2
HDVBID11
HDVBID3
11
bit 3
bit 3
22T
22T
22T
c
bit3
c
12
13
HDVBID12
HDVBID4
bit 2
bit 2
14
T : 1/(f
T : 1/(f
T : 1/(f
= 1.038usec
= 0.782usec
= 963nsec
15
bit20
H
H
x 2200/77)
x 1650/58)
H
HDVBID13
x 33)
HDVBID5
16
bit 1
bit 1
H : White Peak (70+/- 10)%
L : 0 (+10 / - 5) %
17
CRCC
Default Value 0x00
Default Value 0x00
6bits
Line 283
Line 582
Line 20
Line 41
Line 19
Line 24
18
Line
HDVBID14
HDVBID6
19
bit 0
bit 0
2008/03
[AK8825]
20