AL250 International Power Sources, Inc., AL250 Datasheet - Page 27

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

To display the OSD correctly, make sure the horizontal start does not locate between horizontal sync
start and horizontal sync end, and vertical start does not locate between vertical sync start and vertical
sync end.
Reg.#20h to #29h define the video capture control timing.
20h:
21h:
22h:
23h:
24h:
25h:
26h:
27h:
28h:
OsdVstart
MeshColor
MeshEn
Horizontal Capture Start (R/W) [HDESTART]
HDEStart
Horizontal Capture End (R/W) [HDEEND]
HDEEnd
Horizontal Sync Start (R/W) [HSYNCSTART]
HSyncStart
Horizontal Sync End (R/W) [HSYNCEND]
HSyncEnd
Horizontal Total High (R/W) [HTOTAL1]
HTotal10_3
Vertical Capture Start (R/W) [VDESTART]
VDEStart
Vertical Capture End (R/W) [VDEEND]
VDEEnd
Vertical Sync Start (R/W) [VSYNCSTART]
VSyncStart
Vertical Sync End (R/W) [VSYNCEND]
VSyncEnd
<7:4>
<1>
<0>
<7:0>
<7:0>
<7:0>
<7:0>
<7:0>
<7:0>
<7:0>
<7:0>
<7:0>
On Screen Display bitmap 1 and 2 vertical start. (unit: 64
lines)
Mesh color select
0
1
Mesh background enable
0
1
Horizontal capture start. (unit: 8 pixels)
Horizontal capture end. (unit: 8 pixels)
Horizontal sync start. (unit: 8 pixels)
Horizontal sync end. (unit: 8 pixels)
Bit 10 to bit 3 of horizontal total
Bit 2 to bit 1 are defined in Reg.#29h<1:0>
Vertical capture start. (unit: 4 lines)
Vertical capture end. (unit: 4 lines)
Vertical sync start. (unit: 4 lines)
Vertical sync end. (unit: 4 lines)
gray mesh
color 3 mesh
No mesh
Enable mesh background
July 28, 1999
AL250
27