VT8601 Via, VT8601 Datasheet - Page 91
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VT8601
Manufacturer Part Number
VT8601
Description
Slot-1 / Socket-370 PCI North Bridge
Manufacturer
Via
Datasheet
1.VT8601.pdf
(144 pages)
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
VT8601.MSM5100
Manufacturer:
16MB
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Part Number:
VT8601T
Manufacturer:
VIA
Quantity:
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VGA Extended Registers – Graphics Controller Indexed
GRE – Old Source Segment Address ............................... RW
GRE – New Source Segment Address .............................. RW
Revision 1.3 September 8, 1999
7-3
2-1
6-0
0
7
7HFKQRORJLHV ,QF
Reserved
Source Segment Address Select .............. default = 0
Reserved
Reserved
Source Segment Address Select .............. default = 0
Bit-1 is written inverted
:H &
:H &R R QQHFW
QQHFW
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
-85
GRF – Miscellaneous Extended Function Control ........ RW
All bits except 2 and 0 are write protected by SRE_New[7]
7
6
5
4
3
2
1
0
Reserved
Character Clock Division Control Bit-1 (see bit-3)
Symmetric / Asymmetric DRAM Address
Compressed Chain 4 Mode for CPU Path
Character Clock Division Control Bit-0 (see bit-6)
Alternate Bank & Clock Select
Compressed Chain 4 Mode Display Path
Source Segment Address Register Enable
00 No division ............................................ default
01 Divide by 2
10 Divide by 3
11 -reserved-
0
1
0
1
0
1
0
1
0
1
Symmetric.............................................. default
Asymmetric
Disable................................................... default
Enable
Disable 3D8, 3D9, and 3xB................... default
Enable 3D8, 3D9, and 3xB
Disable................................................... default
Enable
Disable GRE.......................................... default
Enable GRE
........................................ always reads 0
VT8601 Apollo ProMedia
VGA Extended Registers