AL250 International Power Sources, Inc., AL250 Datasheet - Page 13

• Manufacturer Part Number: AL250
• Description: Video Scan Doubler
• Manufacturer: International Power Sources, Inc.

Details about the registers can be found in the Register Definition section.
6.4 Border/Border Color
The AL250/251 displays all the active pixels from the video source resulting in a larger viewable area
on a monitor than on a regular TV. This is especially advantageous for digital video sources such as
DVD. However, for some other video sources such as VCR, the unwanted and untrimmed border
may appear. To solve this, the AL250/251 provides border control by cropping the video source. In
addition, the cropped border can be filled with one color (24-bit), which is defined by registers
0Ch~0Eh.
Border/border color control applies to the AL250/251 analog output but not to the AL251 digital
YUV/RGB output.
VBlankStart (2Dh)
VSyncStart (27h)
VBlankEnd (2Eh)
VSyncEnd (28h)
VDEStart (25h)
VDEEnd (26h)
VIDVS
GVSync
Reference start (0)
V Blank Interval
(AL251)
V Blank Interval (AL250)
Top Border
Output V Total
Visible Picture
AL250-26 Vertical timing diagram
Bottom Border
July 28, 1999
AL250
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