AK8826 Datasheet, PDF (24/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

■ Mode Select
[AK8826VN]
AK8826 has 3-function block as Composite Video Encoder, Component Video Encoder and High Speed Video DAC.These
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 DAC Control Register(R/W) [Sub Address 0x0D] and
PLLPDN-bit of Powerdown Mode Register (R/W) [Sub Address 0x06] should be taken care.
I/O Data Format Register
Sub Address 0x0B
bit 7
bit 6
HDSDMASE YC2RGB
bit 5
Reserved
bit 4
DTFMT
bit 3
bit 2
CONVMOD1 CONVMOD0
default Value 0x00
bit 1
bit 0
INPFMT1
INPFMT0
CONVMOD[1:0]-bit
Mode
00
Composite Video Encoder mode
01
Component Video Encoder mode
10
High Speed Video DAC mode
11
Reserved
Note
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 Video Encoder Block
become power down state automatically.
PLLPDN-bit should be set to “0” .
Reserve set
DAC Control Register
Sub Address 0x0D
bit 7
bit 6
Reserved
Reserved
bit 5
OLVL
bit 4
DTRSTN
bit 3
CVBSSEL
bit 2
DAC3EN
default Value 0x00
bit 1
bit 0
DAC2EN
DAC1EN
Output signal from DAC1/2/3 with setting DACnEN-bit =1 (n=1,2,3)
CONVMOD[1:0]-bit
00
CVBSSEL=0 CVBSSEL=1
01
condition
DAC1 output
Y
CVBS
Y
DAC1EN=1
DAC2 output
C
-
Pb
In CVBSSEL=1 case, DAC2EN-bit and DAC3EN-bit
DAC3 output
CVBS
-
Pr
should be set 0. (Output signal from DAC2, DAC3 is 0 )
Powerdown Mode Register
Sub Address 0x06 < HD Block >
bit 7
bit 6
bit 5
Reserved
Reserved
Reserved
bit 4
Reserved
bit 3
Reserved
bit 2
PLLPDN
Default Value 0x00
bit 1
bit 0
SLPEN1
SLPEN0
When setting to Component mode, PLLPDN-bit should be set to “1” since x2 PLL is necessary to work for Component Video
Encoder mode.
PLLPDN-bit
0
1
Operation
PLL is power down states
PLL is working.
Component Video Encoder mode, this bit should be set 1.
MS0972-E-01
24
2008/12