VT8601 Via, VT8601 Datasheet - Page 55

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

Device 0 Offset 83-80 - GART/TLB Control ................... RW
Note: For any master access to the Graphics Aperture range,
snoop will not be performed.
Revision 1.3 September 8, 1999
31-16 Reserved
15-8 Reserved (test mode status)................................. RO
6-4
7
3
2
1
0
7HFKQRORJLHV ,QF
Flush Page TLB
Reserved (always program to 0) ........................ RW
PCI Master Address Translation for GA Access
AGP Master Address Translation for GA Access
CPU Address Translation for GA Access
AGP Address Translation for GA Access
:H &
:H &R R QQHFW
0
1
0
1
0
1
0
1
0
1
QQHFW
Disable ...................................................default
Enable
Addresses generated by PCI Master accesses
of the Graphics Aperture will not be translateddefault
PCI Master GA addresses will be translated
Addresses generated by AGP Master accesses
of the Graphics Aperture will not be translateddefault
AGP Master GA addresses will be translated
Addresses generated by CPU accesses of the
Graphics Aperture will not be translated ..... def
CPU GA addresses will be translated
Addresses generated by AGP accesses of the
Graphics Aperture will not be translated ..... def
AGP GA addresses will be translated
........................................ always reads 0
-49-
Device 0 Offset 84 - Graphics Aperture Size .................. RW
Offset 8B-88 - GA Translation Table Base ..................... RW
Note: If TLB miss, the TLB table is fetched by the address:
Gr Ap Trans Table Base [31:12] + A[27:22], A[21:12], 2’b00
31-12 Graphics Aperture Translation Table Base
11-3 Reserved
7-0
2
1
0
Graphics Aperture Size
Pointer to the base of the translation table in system
memory used to map addresses in the aperture range
(the pointer to the base of the "Directory" table).
One Cycle TLB Flush Command
Graphics Aperture Enable
Note: To disable the Graphics Aperture, set this bit
to 0 and set all bits of the Graphics Aperture Size to
0. To enable the Graphics Aperture, set this bit to 1
and program the Graphics Aperture Size to the
desired aperture size.
Reserved
11111111 1M
11111110 2M
11111100 4M
11111000 8M
11110000 16M
11100000 32M
11000000 64M
10000000 128M
00000000 256M
0
1
0
1
Disable................................................... default
Enable ................................... should be set to 1
Disable................................................... default
Enable Graphics Aperture Address [31:28]
........................................ always reads 0
........................................always reads 0
Device 0 Bus 0 Host Bridge Registers
VT8601 Apollo ProMedia