ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 113

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

■ Video Interface Timing (Composite Video Encoder Block)
To synchronize with input data, AK8825 supports two kinds of interface mode.
This interface mode is set by REC656-bit of SD Blanking Set Register (R/W) [Sub Address 0x10] .
SD Blanking Set Register
Sub Address 0x10
(1) ITU-R BT.656 I/F mode
HSYNC. AK8825 outputs HSYNC at the rising edge of SYSCLK in the timing of the 32nd/24th (NTSC/PAL) data slot, which is
counted from the [EAV] starting point as below.
REC656-bit=1 of SD Blanking Set Register (R/W) [Sub Address 0x10] should be “0” for setting to this mode.
Rev-E-00
When AK8825 receives ITU-R BT. 656 signal, AK8825 decodes [EAV] code in the data for synchronization then outputs the
525 system
625 system
Analog O ut
(1) ITU-R BT.656 interface mode
(2) Slave operation with HD/VD Interface mode
C LK IN
Y /C b/C r
D ata#
D ata#
REC656-bit
H D I
SDBLN4
bit 7
0
1
360 720 360 721 361 722 361 723
360 720 360 721 361 722 361 723
C b
Y
E AV
SDBLN3
C r
Slave operation with HD/VD
bit 6
ITU-R.BT656 I/F mode
Y
33 / 25T (525 / 625)
Interface mode
C b
Y
SDBLN2
bit 5
C r
Y
SDBLN1
bit 4
276/ 288T (525 / 625)
368 736 368
366 732 366
C b
Fig. 155
113
Y
Note
C r
SDBLN0
bit 3
243 / 263T (525 / 625)
855 428 856 428 857
861 431 862 431 863
Y
Reserved
C b
bit 2
Y
SA V
C r
Reserved
Y
bit 1
C b
0
0
Default Value 0xA1
Y
0
0
C r
0
0
REC656
bit 0
Y
1
1
2008/03
[AK8825]
C b
1
1