VT8601 Via, VT8601 Datasheet - Page 44

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

Device 0 Offset 55-54 - Non-Cacheable Region #1 ......... RW
Device 0 Offset 57-56 - Non-Cacheable Region #2 ......... RW
Revision 1.3 September 8, 1999
15-3 Base Address - A<28:16>........................... default=0
15-3 Base Address MSBs - A<28:16>................ default=0
2-0
2-0
7HFKQRORJLHV ,QF
As noted below, the base address must be a multiple
of the region size.
Range (Region Size)
As noted below, the base address must be a multiple
of the region size.
Range (Region Size)
:H &
:H &R R QQHFW
000 Disable ...................................................default
001 64K
010 128K (Base Address A16 must be 0)
011 256K (Base Address A16-17 must be 0)
100 512K (Base Address A16-18 must be 0)
101 1M (Base Address A16-19 must be 0)
110 2M (Base Address A16-20 must be 0)
111 4M (Base Address A16-21 must be 0)
000 Disable ...................................................default
001 64K
010 128K (Base Address A16 must be 0)
011 256K (Base Address A16-17 must be 0)
100 512K (Base Address A16-18 must be 0)
101 1M (Base Address A16-19 must be 0)
110 2M (Base Address A16-20 must be 0)
111 4M (Base Address A16-21 must be 0)
QQHFW
-38-
DRAM Control
These registers are normally set at system initialization time
and not accessed after that during normal system operation.
Some of these registers, however, may need to be
programmed using specific sequences during power-up
initialization to properly detect the type and size of installed
memory (refer to the VIA Technologies VT8601 BIOS
porting guide for details).
Space Start
DOS
VGA 640K 128K 000A0000-000BFFFF Used for SMM
BIOS 768K
BIOS 784K
BIOS 800K
BIOS 816K
BIOS 832K
BIOS 848K
BIOS 864K
BIOS 880K
BIOS 896K
BIOS 960K
Sys
Bus
Init 4G-64K 64K FFFEFFFF-FFFFFFFF 000Fxxxx alias
D Top
1MB
0
Table 3. System Memory Map
640K 00000000-0009FFFF
Size
16K 000C0000-000C3FFF Shadow Ctrl 1
16K 000C4000-000C7FFF Shadow Ctrl 1
16K 000C8000-000CBFFF Shadow Ctrl 1
16K 000CC000-000CFFFF Shadow Ctrl 1
16K 000D0000-000D3FFF Shadow Ctrl 2
16K 000D4000-000D7FFF Shadow Ctrl 2
16K 000D8000-000DBFFF Shadow Ctrl 2
16K 000DC000-000DFFFF Shadow Ctrl 2
64K 000E0000-000EFFFF Shadow Ctrl 3
64K
—
DRAM Top-FFFEFFFF
00100000-DRAM Top Can have hole
000F0000-000FFFFF
Device 0 Bus 0 Host Bridge Registers
Address Range
VT8601 Apollo ProMedia
Comment
Cacheable
Shadow Ctrl 3