VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-134
3D Graphics Engine Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
Memory Interface Registers
The registers in this group include stride and buffer base
address registers for frame buffer control.
There are three
base addresses:
source base address (added to blt source),
destination base address (added to color destination), and Z
base address (added to Z addresses).
GEbase + B8 – Destination Stride / Buffer Base 0..........RW
GEbase + BC – Destination Stride / Buffer Base 1.........RW
GEbase + C0 – Destination Stride / Buffer Base 2 .........RW
GEbase + C4 – Destination Stride / Buffer Base 3 .........RW
GEbase + C8 – Source Stride / Buffer Base 0 .................RW
GEbase + CC – Source Stride / Buffer Base 1 ................RW
GEbase + D0 – Source Stride / Buffer Base 2 .................RW
GEbase + D4 – Source Stride / Buffer Base 3 .................RW
All eight of the above registers have the same bit definitions:
31-29 Bits Per Pixel
000 8 bits per pixel
001 16 bits per pixel (565 format)
010 32 bits per pixel
011 -reserved-
100 -reserved-
101 16 bits per pixel (555 format)
11x -reserved-
28-20 Stride (pixels divided by 8)
19-0 Buffer Base Address (in quadwords)
GEbase + D8 – Z Depth / Z Buffer Base..........................RW
31-30 Z Depth
00 16 bits
01 24 bits (32 bits are allocated in the frame
buffer with the MSB not used)
1x -reserved-
29
Reserved
........................................ always reads 0
28-20 Z Stride
19-0 Z Buffer Base Address (in quadwords)
There are 9 texture base registers for up to 9 levels of
MipMaps: level 0 (1:1 map) up to level 8 (smallest). The
texture may be in the frame buffer or in system memory.
GEbase+DC – Texture Base MipMap Level 0 (1:1 Map)RW
GEbase + E0 – Texture Base MipMap Level 1 .............. RW
GEbase + E4 – Texture Base MipMap Level 2 .............. RW
GEbase + E8 – Texture Base MipMap Level 3 .............. RW
GEbase + EC – Texture Base MipMap Level 4 ............. RW
GEbase + F0 – Texture Base MipMap Level 5 .............. RW
GEbase + F4 – Texture Base MipMap Level 6 .............. RW
GEbase + F8 – Texture Base MipMap Level 7 .............. RW
GEbase+FC – Texture Base MipMap Level 8 (Smallest)RW
All nine of the above registers have the same bit definitions:
31-0 Texture Base Address (in bytes)
Base addresses always start on QWORD boundaries
so bits 2-0 are always 0.
Data Port Area
GEbase + 10000-1FFFFh – Data Port Area ................... RW
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
