ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 28

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

■ Mode Select
functions are selected by CONVMOD[1:0]-bit of I/O Data Format Register (R/W) [Sub Address 0x0B] .
At mode change timing, CONVMOD[1:0]-bit and DACnEN-bit of
PLLPDN-bit of
I/O Data Format Register
Sub Address 0x0B
DAC Control Register
Sub Address 0x0D
Output signal from DAC1/2/3 with setting DACnEN-bit =1 (n=1,2,3)
Powerdown Mode Register
Sub Address 0x06
When setting to Component mode, PLLPDN-bit should be set to “1” since x2 PLL is necessary to work for Component Video
Encoder mode.
Rev-E-00
DAC1 output
DAC2 output
DAC3 output
HDSDMASE
PLLPDN-bit
AK8825 has 3-function block as Composite Video Encoder, Component Video Encoder and High Speed Video DAC.These
CONVMOD[1:0]-bit
Reserved
Reserved
bit 7
bit 7
bit 7
0
1
00
01
10
11
Powerdown Mode
PLL is power down states
PLL is working.
Component Video Encoder mode, this bit should be set 1.
CVBSSEL=0
Reserved
Reserved
YC2RGB
CVBS
bit 6
bit 6
bit 6
C
Y
< HD Block >
Composite Video Encoder mode
Component Video Encoder mode
High Speed Video DAC mode
Reserved
00
CONVMOD[1:0]-bit
CVBSSEL=1
Reserved
Reserved
Register (R/W) [Sub Address 0x06] should be taken care.
OLVL
bit 5
bit 5
bit 5
CVBS
-
-
Mode
Reserved
DTRSTN
DTFMT
bit 4
bit 4
bit 4
Pb
01
Pr
Y
Operation
28
CONVMOD1
CVBSSEL
Reserved
DAC1EN=1
In CVBSSEL=1 case, DAC2EN-bit
should be set 0. (Output signal from DAC2, DAC3 is 0 )
DAC Control
bit 3
bit 3
bit 3
Component Video Encoder Block becomes power
down state automatically.
PLL Block is still working, PLLPDN-bit can make
PLL block to power down state.
Composite Video Encoder Block becomes Power
down states automatically.
PLLPDN-bit should be set to “1” for this mode.
Composite/Component
become power down state automatically.
PLLPDN-bit should be set to “0” .
Reserve set
CONVMOD0
DAC3EN
PLLPDN
Register(R/W) [Sub Address 0x0D] and
bit 2
bit 2
bit 2
condition
Note
INPFMT1
DAC2EN
SLPEN1
Video
bit 1
bit 1
bit 1
default Value 0x00
default Value 0x00
Default Value 0x00
and DAC3EN-bit
Encoder
INPFMT0
DAC1EN
SLPEN0
bit 0
bit 0
bit 0
2008/03
[AK8825]
Block