ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 106

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

(2) CEA-805-B
This standard is adopted to 480p / 1080i / 720p output mode. CEA805-B Type-A standard is same as CEA-805-A standard.
*1 SYNC signal waveform of 480p differ from the above, but timing is defined based on 0H point as starting points.
*2 position of 232T is the position before starting active video area.
When to set CEA-805-B TypeB Data, set HDCEA805B-bit of HD Block Miscellaneous Control Register[SubAddress 0x0A]
to “1”, and write a setting value to VBID-B Header Data Register/VBID Version Number Register/VBID Payload Packet
Length Register/VBID-B Data1/2/3/4/5/6/7/8/9/10/11/12/13 Register {SubAddress 0x40 - 0x50}
CRCC is automatically calculated and added in the AK8825.
Default values of “CRCC Polynomial expression X6+X+1” are all ones (see diagram bellows)
Rev-E-00
70%
480P*
0
-300mV
1080i
720P
700mV
Input
1
(Time from 0H)
0
H
232T*
D
156T
308T
a
2
a
b
S SB : Star Symbol
D
10T
4T
8T
b
b
D
b
Fig. 149
Fig. 150
106
D
Tolerance form 0H
+/- 18.5ns
+/- 18.5ns
+/- 18.5ns
SW1
b
D
D
T : 1/74.25MHz
T : 1/74.25MHz
T : 1/27MHz
•
•
H : White Peak (70+/- 10)%
•
b
a
L : 0 (+10 / - 5) %
SW2
Line 581
Line 43
Line 18
Line 23
Line
Output
2008/03
[AK8825]