AK8858 Datasheet, PDF (41/96 Pages) Asahi Kasei Microsystems – PS/SD Multi Format Video Decoder

[AK8858]
[7.22] Digital Pixel Interpolar
The digital pixel interpolar of the AK8858 aligns vertical pixel positions in both frame-lock and fixed-clock
operating modes. The pixel interpolar can be set to ON or OFF via register. With a register setting of AUTO, the
pixel interpolar is OFF or ON depending on the clock mode, as follows.
Line-locked clock mode OFF
Frame-locked clock mode ON
Fixed-clock mode
ON
Settings for pixel interpolar operation
INTPOL[1:0]-bit
Interpolar operation
00
Auto
01
ON
10
OFF
11
Reserved
Sub Address: 0x0C [5:4]
Notes
Dependent on clock mode
[7.23] Phase correction
In PAL-B, D, G, H, I, N, Nc, 60, and M decoding, the AK8858 performs phase correction for each line. With this
function ON, color averaging is performed for each line. In the adaptive phase correction mode, interline phase
correlation is sampled and color averaging is performed for correlated samples.
Interline color averaging is also performed in NTSC-M and J decoding.
No phase correction or color averaging is performed in SECAM decoding.
Settings for phase correction
DPAL[1:0]-bit
Status
00
Adaptive phase correction mode
01
Phase correction ON
10
Phase correction OFF
11
Reserved
Sub Address: 0x0D [1:0]
Notes
[7.24] No-signal output
If no input signal is found (as shown by control bit NOSIG-bit), the output signal is black-level, blue-level
(blueback), or input-state (sandstorm), depending on the register setting.
Settings for output signals for no input signal
NSIGMD [1:0]-bit
Output
00
Black-level
01
Blue-level (blueback)
10
Input-state (sandstorm)
11
Reserved
Sub Address: 0x07 [3:2]
Notes
MS1230-E-00
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2010/9