AK8857VQ Datasheet, PDF (47/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
Input Signal Auto Detection Function
The register settings for auto detection are essentially as follows.
○AUTODET-bit: Settings for auto detection of input signal (auto detection mode)
AUTODET-bit
Auto detection
Notes
[0]
OFF
Manual setting
[1]
ON
The auto detection recognizes the following parameters.
Number of lines per frame: 525/625
Carrier frequencies: 3.57954545
3.57561149
3.58205625
4.43361875
Color encoding formats: NTSC
PAL
SECAM
Monochrome signal: Not monochrome/monochrome
Note: Automatic monochrome detection is active if the color kill setting is ON (COLKILL-bit = [1].)
The AK8857 stores the detected parameter to the Input Video Status Register (thus, as an internal
notice function).
This enables the host to distinguish among the formats NTSC-M, J; NTSC-4.43; PAL-B, D, G, H, I, N;
PAL-M; PAL-Nc; PAL-60; SECAM; and monochrome.
It should be noted that it does not detect NTSC-M, NTSC-J, or PAL-B, D, G, H, I, N formats.
(Notice)
“Direct SYNC VLOCK” (Sub-Address0x03[7]=1) must not use when it is being operated on auto
detection function.
MS1189-E-01
-47-
2010/12