VT8601 Via, VT8601 Datasheet - Page 119

• Manufacturer Part Number: VT8601
• Description: Slot-1 / Socket-370 PCI North Bridge
• Manufacturer: Via

Graphics Engine Core
GEbase + 10 - Right View Display Base Address ........... RW
Writing to this register sets Status Register bit-21 to 0. Later
when the address is used to display a frame, the status bit is
changed to 1.
GEbase + 14 - Left View Display Base Address .............. RW
Writing to this register sets Status Register bit-20 to 0. Later
when the address is used to display a frame, the status bit is
changed to 1.
Revision 1.3 September 8, 1999
30-24 Reserved
30-24 Reserved
23-0 Right View Display Starting Address
23-0 Left View Display Starting Address
31
31
7HFKQRORJLHV ,QF
Right View Active
Left View Active
:H &
:H &R R QQHFW
0
1
0
1
QQHFW
Inactive (use VGA style for display start
address) ..................................................default
Active (use the base register address in this
register for the display starting address)
Disable (only Right View Display Starting
Address is used) .....................................default
Enable (Right View Display Starting Address
is used for the right view and this register for
the left view; hardware will use these two
addresses alternately)
........................................ always reads 0
........................................ always reads 0
-113
GEbase + 18 – Block Write Start Address ...................... RW
GEbase + 1C – Block Write Area / End Address ........... RW
Rectangle Area Fill Mode
Linear Area Fill Mode
Writing to this register triggers a Memory Set operation.
Color for this operation is specified in the Foreground register.
30-24 Reserved
31-28 Reserved
27-16 Height of the Area
15-12 Reserved
23-0 Starting Address (in multiples of 64 bytes)
11-0 Width of the Area (in bytes)
31-0 End Address (in multiples of 64 bytes inclusive)
31
Linear Mode
Stride is Destination Stride in port 21C0h
0
1
Fill a rectangle area................................ default
Fill a linear area
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
VT8601 Apollo ProMedia
3D Graphics Engine Registers