Product specifications

VT8601A Apollo PLE133
Revision 1.82 October 22, 2001 -96- VGA Extended Registers
Technologies, Inc.
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CR62 – Enhancement 0......................................................RW
7 Pause GE Operation (GEPAUSE)
0 Normal GE Operation............................ default
1 Pause GE Operation
6 PCI Retry for GE (ENGERTRY)
0 Disable ................................................... default
1 Enable
5 Short Command (ENSHRT)
0 Disable ................................................... default
1 Enable
4 Direct Read Even if GE is Busy (ENDIRRD)
0 Disable ................................................... default
1 Enable
3 Reserved .........................................always reads 0
2 Low Priority Arbitration Policy
0 Fixed Priority
1 Round Robin ......................................... default
1 High Priority Arbitration Policy
0 Fixed Priority ......................................... default
1 Round Robin
0 Frame Buffer Memory Size Select
0 8MB ..................................................... default
1 4MB
CR63 – Enhancement 1 .....................................................RW
7-6 Reserved .........................................always reads 0
5-4 Memory Folding Control
00 Normal ....................................................default
01 FOLD6
10 FOLD7
11 -reserved-
3-2 Reserved .........................................always reads 0
1-0 Extended FIFO Latency Control (LATV[5-4])
Combined with CR30
CR64 – DPA Extra ..........................................................RW
7 DPA On/Off
0 On ......................................................default
1 Off
6 DPA Bypass
0 Normal ....................................................default
1 Bypass
5-3 Reference Feedback Clock Delay
Maximum 2ns............................................. default = 0
2-0 Reference Internal Clock Delay
Maximum 2ns............................................. default = 0