Product specifications

ProSavageDDR P4M266 – VT8751 P4 DDR SMA North Bridge
Revision 1.1, July 19, 2002 -51- Device 1 Register Descriptions
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Technologies, Inc.
Device 1 Offset 43 - AGP Master Latency Timer (22h) RW
7-4 Host to AGP Time slot
0 Disable (no timer)
116GCLKs
232GCLKs.............................................default
……
F 128 GCLKs
3-0 AGP Master Time Slot
0 Disable (no timer)
116GCLKs
232GCLKs.............................................default
……
F 128 GCLKs
Device 1 Offset 45 – Fast Write Control (72h) ............... RW
7 Force Fast Write Cycle to be QW Aligned
(if Rx45[6] = 0)
0 Disable................................................... default
1 Enable
6 Merge Multiple CPU Transactions Into One Fast
Write Burst Transaction
0Disable
1 Enable................................................... default
5 MergeMultipleCPUWriteCyclesToMemory
Offset 23-20 Into Fast Write Burst Cycles
(if Rx45[6] = 0)
0Disable
1 Enable................................................... default
4 MergeMultipleCPUWriteCyclesTo
Prefetchable Memory Offset 27-24 Into Fast
Write Burst Cycles (if Rx45[6] = 0)
0Disable
1 Enable................................................... default
3 Reserved ........................................always reads 0
2 Fast Write Burst 4T Max (No Slave Flow Control)
0 Disable................................................... default
1 Enable
1 Fast Write Fast Back to Back
0Disable
1 Enable................................................... default
0 Fast Write Initial Block 1 Wait State
0 Disable................................................... default
1 Enable
Rx45 CPU Write CPU Write
Bits Address Address
7-4
in Mem1 in Mem2 Fast Write Cycle Alignment
x1xx - - QW aligned, burstable
0000 - - DW aligned, nonburstable
x010 0 0 n/a
0010 0 1 DW aligned, non-burstable
x010 1 - QW aligned, burstable
x001 0 0 n/a
x001 - 1 QW aligned, burstable
0001 1 0 DW aligned, non-burstable
x011 0 0 n/a
x011 1 - QW aligned, burstable
x011 0 1 QW aligned, burstable
1000 - - QW aligned, non-burstable
1010 0 1 QW aligned, non-burstable
1001 1 0 QW aligned, non-burstable