AK8857VQ Datasheet, PDF (48/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
Limiting auto input video signal detection function
The AK8857 has the function to limit the input video signal to be detected during auto detection
mode.
○NDMODE Register: For limiting auto detection candidates
Bit Register Name
R/W Definition
bit 0 _NDPALM
No Detect PAL-M bit
[0]: PAL-M candidate
R/W
[1]: PAL-M non-candidate
bit 1 _NDPALNC
No Detect PAL-Nc bit
0]: PAL-Nc candidate
R/W
[1]: PAL-Nc non-candidate
bit 2 _NDSECAM
No Detect SECAM bit
[0]: SECAM candidate
R/W
[1]: SECAM non-candidate
bit 3 _Reserved
bit 4 _NDNTSC443
bit 5 _NDPAL60
bit 6 _ND525L
bit 7 _ND625L
Reserved
R/W Reserved
No Detect NTSC-4.43
0]: NTSC-4.43 candidate
R/W
bit
[1]: NTSC-4.43 non-candidate
No Detect PAL-60 bit
[0]: PAL-60 candidate
R/W
[1]: PAL-60 non-candidate
No Detect 525Line bit
[0]: 525 line candidate
R/W
[1]: 525 line non-candidate
No Detect 625Line bit
[0]: 625 line candidate
R/W
[1]: 625 line non-candidate
In making the above register settings, the following restrictions is apply,
1. Setting both NDNTSC443(bit 4) and NDPAL60(bit 5) to [1] (High) is prohibited.
2. Setting both ND525L(bit 6) and ND625L(bit 7) to [1] (High) is prohibited.
3. To limit candidate formats, it is necessary to have the auto detection mode OFF while first
setting the register to non-limited signal status and next the NDMODE settings, and then
setting the auto detection mode to ON.
Set auto detection mode to OFF
Set Input Video Standard Register to non-limited signal status
Enter NDMODE Register Settings
Set auto detection mode to ON
MS1189-E-01
-48-
2010/12