Product specifications

ProSavageDDR P4M266 – VT8751 P4 DDR SMA North Bridge
Revision 1.1, July 19, 2002 -45- Device 0 Register Descriptions
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Technologies, Inc.
DRAM Interface Control
Device 0 Offset BE – MECC Drive Strength (00h) ........RW
7-6 MECC Drive Strength ............................ default = 0
5-0 Reserved ........................................ always reads 0
Device 0 Offset BF – DRAM Pad Toggle Reduction (00h)RW
7 MA / SCMD Pin Toggle Reduction
0 Disable ...................................................default
1 Enable (MA and S command pins won’t
toggle if not accessed)
6 Slew Rate Control for MA / SCMD Group A
0 Disable ...................................................default
1 Enable
5 Slew Rate Control for MA / SCMD Group B
0 Disable ...................................................default
1 Enable
4 Reserved ........................................ always reads 0
3 DIMM #3 MAA / MAB Select
0 MAA .....................................................default
1MAB
2 DIMM #2 MAA / MAB Select
0 MAA .....................................................default
1MAB
1 DIMM #1 MAA / MAB Select
0 MAA .....................................................default
1MAB
0 DIMM #0 MAA / MAB Select
0 MAA .....................................................default
1MAB
Power Management
Device 0 Offset C0 – Power Management Capability IDRO
7-0 Capability ID ..................................always reads 01h
Device 0 Offset C1 – Power Management New Pointer . RO
7-0 Next Pointer...............................................................
Device 0 Offset C2 – Power Mgmt Capabilities I ........... RO
7-0 Power Management Capabilities ..always reads 02h
Device 0 Offset C3 – Power Mgmt Capabilities II.......... RO
7-0 Power Management Capabilities ..always reads 00h
Device 0 Offset C4 – Power Mgmt Control / Status ...... RW
7-2 Reserved ........................................always reads 0
1-0 Power State
00 D0 .................................................... default
01 -reserved-
10 -reserved-
11 D3 Hot
Device 0 Offset C5 – Power Management Status............ RO
7-0 Power Management Status............always reads 00h
Device 0 Offset C6 – PCI-to-PCI Bridge Support Ext.... RO
7-0 P2P Bridge Support Extensions....always reads 00h
Device 0 Offset C7 – Power Management Data .............. RO
7-0 Power Management Data ..............always reads 00h
ECC Error Control
Device 0 Offset D3-D0 – ECC Error Address (xxh) ....... RO
Device 0 Offset D4 – ECC Error Syndrome (xxh).......... RO