Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
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17.8.
OVRACT—Overlay Active Register
Address Offset:
6001Ch
Default Value:
00000000h
Access: Read/Write
Size: 32
Size: 32
bits
31
27
26
16
Reserved Overlay
Active
End
15
12 11
0
Reserved Overlay
Active
Start
Bit Description
31:27
Reserved.
26:16
Overlay Active End. This filed takes into account the Overlay pipeline delays for turning off the overlay
at the end of a scan line. When LCD / TV is enabled, then the overlay active end is controlled by the
LCD / TV-Out Timing Generator and uses all the bits. When LCD / TV is disabled, then the overlay
active end is controlled by the VGA Timing Generator and uses bits 15:3 for character clock resolution.
at the end of a scan line. When LCD / TV is enabled, then the overlay active end is controlled by the
LCD / TV-Out Timing Generator and uses all the bits. When LCD / TV is disabled, then the overlay
active end is controlled by the VGA Timing Generator and uses bits 15:3 for character clock resolution.
15:12
Reserved.
11:0
Overlay Active Start. This field takes into account the Overlay pipeline delays for lining up X=0 to the
first active pixel. When LCD / TV is enabled, then the overlay active start is controlled by the LCD /
TV-Out Timing Generator and all the bits are used. When LCD / TV is disabled, then the overlay active
start is controlled by the VGA Timing Generator and uses bits 15:3 for character clock.
first active pixel. When LCD / TV is enabled, then the overlay active start is controlled by the LCD /
TV-Out Timing Generator and all the bits are used. When LCD / TV is disabled, then the overlay active
start is controlled by the VGA Timing Generator and uses bits 15:3 for character clock.
17.9.
BCLRPAT— Border Color Pattern Register
Address Offset:
60020h
Default Value:
00000000h
Access: Read/Write
Size: 32
Size: 32
bits
A border is sent if Border Enable is on. Also same color will be sent during pseudo border period in
LCD no-scalar mode.
LCD no-scalar mode.
In VGA Centering mode, the VGA border color will be sent instead of the Flat Panel Border Color.
HIRes Centering mode will still use the Flat Panel Border color.
HIRes Centering mode will still use the Flat Panel Border color.
31 25
24 16
15 8
7 0
Reserved Red Green Blue
Bit Description
31:25
Reserved.
24:16
Red.
15:8
Green.
7:0
Blue.