VT8601 Via, VT8601 Datasheet - Page 91

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

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