ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 44

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

ASAHI KASEI
15-9. Video ID(HD)
The AK8823 has a function to super-impose a Copy Protect Information CGMS-A type-A on output signal.
20 Bit data is configured with WORD 0 : 2 bits / WORD 1 : 4 bits / WORD 2 : 8 bits / CRCC : 6 bits, as shown above.
When to set CGMS-A Data, set CGMS-bit of [ Mode Register ] ( Address 0x03 ) to “ 1 “, and write a setting value to [ CGMS-A
Data 1 / 2 Register ].
CRCC is automatically calculated and added in the AK8823.
Default value of “ CRCC Polynomial expression X6 + X + 1 “ are all ones ( see diagram below ).
CRCC generation is made as follows –
Set default values to all ones and close SW1.
Set SW2 to “ a “ position and first 14 bit data is input, then at the 15
output.
When CGMS-A output and other signal waveforms coincide, CGMS-A precedes.
MS0549-E-02
bit
Data
* SYNC signal waveform of 525i / p ( 480i / p ) signals differ from the above, but timing is defined based on 0H point as
starting point.
70%
(480P)
Input
0
-300mV
525P*
(480i)
1080i
525i*
720P
700mV
WORD 0
1
2bits
2
6T (5.8 +/- 0.15usec)
( 4.15 +/- 0.16usec)
(3.13 +/- 0.09usec)
11.2 +/- 0.3usec
( time from 0H )
( time from 0H )
D
0
H
3
4T
4T
a
WORD 1
4
4bits
a
5
D
6
2.235 +/- 50nsec
T +/- 30nsec
T +/- 30nsec
T +/- 30nsec
Ref
7
D
b
8
9
44
D
bit1
b
WORD 2
10
( 22.84 +/- 0.21usec)
(17.20+/- 0.16usec)
(21.2 +/- 0.22usec)
49.1 +/- 0.44usec
8bits
bit2
th
SW1
D
11
bit, open SW1 and set SW2 to “ b “ position, and CRCC is
22T
22T
22T
c
bit3
c
12
D
13
T : 1/(f
T : 1/(f
T : 1/(f
14
= 1.038usec
= 0.782usec
= 963nsec
15
bit20
H
H
H
x 33)
x 2200/77)
x 1650/58)
16
b
a
H : White Peak (70+/- 10)%
L : 0 (+10 / - 5) %
SW2
17
CRCC
6bits
Line
Line 20
Line 283
Line 41
Line 19
Line 582
Line 24
Output
18
2006/10
[AK8823]
19
20