PEDL87V21071-01
OKI Semiconductor
ML87V21071
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Setting of Input System Horizontal Valid Pixel Start Position
The input system horizontal valid pixel start position (IHPS) is set in pixel unit with reference to the input
system horizontal reset (IHR: internal signal), generated from IHS, by setting NPHWE[7:0]
(SUB:45h-bit[7:0]).
The data subsequent to IHPS is written in the data memory of valid pixels as the valid data.
This value can be set in 255 levels of ±127 pixels with regard to the initial value (NPHWE[7:0] = 80h).
In the ITU-R BT.656 mode, the value cannot be set. Write enable with regard to valid data is generated on the
basis of detected SAV, EAV.
Table F1-1-3 (5) Input System Horizontal Valid Pixel Start Position
HMD
VMD
[0]
IHPS position (Number of pixels from IHS)
[1]
[0]
0
NPHWE=01h
17 (–127 pixels)
11 (–127 pixels)
49 (–127 pixels)
13 (–127 pixels)
49 (–127 pixels)
15 (–127 pixels)
NPHWE=80h
144 (default)
138 (default)
176 (default)
140 (default)
176 (default)
142 (default)
NHPWE=FFh
271 (+127 pixels)
265 (+127 pixels)
303 (+127 pixels)
267 (+127 pixels)
303 (+127 pixels)
269 (+127 pixels)
……
……
……
……
……
……
……
……
……
……
……
……
……
……
0
0
0
0
1
1
0
1
0
1
0
1
0
1
1
0
0
Other than above
Test modes (Setting inhibited)
127 pixels
127 pixels
IHS
IHPS
640/720/768 pixels
Valid data
#IWE
1 pixel
1 pixel
YI[7:0]
CI[7:0]
Figure F1-1-3 (5) Input System Horizontal Valid Pixel Start Timing
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