AK8850 Datasheet, PDF (66/99 Pages) Asahi Kasei Microsystems – NTSC Digital Video Decoder

ASAHI KASEI
[AK8850]
Output Interface Set Register :
Output Interface is set by the [ OUTPUT FORMAT REGISTER ].
* [ OUTPUT FORMAT REGISTER ]
bit 7
bit 6
bit 5
ACTSTA[2]
ACTSTA[1]
ACTSTA[0]
0
0
0
bit 4
bit 3
YCDELAY[2] YCDELAY[1]
Default Value
0
0
bit 2
YCDELAY[0]
0
bit 1
601LIMIT
0
[ ERRHND ]-bit of the [ OUTPUT FORMAT REGISTER ] controls error handling as follows.
* ERRHND-bit
ERRHND-bit
0
1
Number of sample is constant
Number of line in a frame is constant
525 System : 858 samples
625 System : 864 samples
525 System : 525Line
625 System : 625Line
Fine-tuning of the start position is accomplished by programming the ACTSTA [2 :0 ]-bit.
bit 0
ERRHND
0
0H point
* ACTSTA [ 2 : 0 ]-bit set
ACTSTA2:ACTSTA0
100
101
110
111
000
001
010
011
122th sample (525 System)
132th sample (625 System)
Function
525system : Active Video starts at the 119th sample
625system : Active Video starts at the 129th sample
525system : Active Video starts at the 120th sample
625system : Active Video starts at the 130th sample
525system : Active Video starts at the 121th sample
625system : Active Video starts at the 131th sample
525system : Active Video starts at the 122th sample
625system : Active Video starts at the 132th sample
525system : Active Video starts at the 123th sample
625system : Active Video starts at the 133th sample
525system : Active Video starts at the 124th sample
625system : Active Video starts at the 134th sample
525system : Active Video starts at the 125th sample
625system : Active Video starts at the 135th sample
525system : Active Video starts at the 126th sample
625system : Active Video starts at the 136th sample
Note
default
a fine-tuning of the YC output timing is possible by setting YC delay [ 2 : 0 ]-bit of the [ OUTPUT FORMAT
REGISTER ].The YC delay fine-tuning bit is set in 2’s complement values.
ACTSTA2:ACTSTA0
Function
Note
100
Y data is delayed 4samples (296nsec) agaist C-data
101
Y data is delayed 3samples (222nsec) agaist C-data
110
Y data is delayed 2samples (148nsec) agaist C-data
111
Y data is delayed 1sample (74nsec) agaist C-data
000
No delay
001
C data is delayed 1sample (74nsec) agaist Y-data
010
C data is delayed 2samples (148nsec) agaist Y-data
011
C data is delayed 3samples (222nsec) agaist Y-data
Default
Rev.0
66
2003/01