Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -58- Device 0 Function 4 Register Descriptions – Power Management
Device 0 Function 4 Device-Specific Registers
These registers are normally programmed once at system
initialization time.
Power Management Control
Offset A0 – Power Management Mode (00h)..................RW
7 Dynamic Power Management
0 Disable ...................................................default
1 Enable
6 Halt / Shutdown Power Management
0 Disable ...................................................default
1 Enable
5 Stop Clock Power Management
0 Disable ...................................................default
1 Enable
4 Suspend Status Power Management
0 Disable ...................................................default
1 Enable
3-0 Reserved ........................................ always reads 0
Offset A1 – DRAM Power Management (00h) ...............RW
7 Reserved ........................................ always reads 0
6 Dynamic CKE when DRAM Idle
0 Disable ...................................................default
1 Enable
5 Dynamic DRAM I/O Pad Power Down (Float)
0 Disable ...................................................default
1 Enable
4-0 Reserved ........................................ always reads 0
Offset A2 – Dynamic Clock Stop Control (00h)............. RW
7 Host Interface Power Management
0 Disable................................................... default
1 Enable
6 DRAM Interface Power Management
0 Disable................................................... default
1 Enable
5 V-Link Interface Power Management
0 Disable................................................... default
1 Enable
4 AGP Interface Power Management
0 Disable................................................... default
1 Enable
3 PCI #2 Interface Power Management
0 Disable................................................... default
1 Enable
2 Graphics Interface Power Management
0 Disable................................................... default
1 Enable
1 Reserved ........................................always reads 0
0 Host Fast Power Management (DADS Fast
Timing)
0 Disable................................................... default
1 Enable
Offset A3 – 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)
6-0 Reserved ........................................always reads 0
BIOS Scratch
Offset D0-EF – BIOS Scratch Registers ......................... RW
7-0 No hardware function..............................default = 0