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