©2008 Advanced Micro Devices, Inc. LPC ISA Bridge (Device 20, Function 3)
AMD SB600 Register Reference Manual Proprietary Page 249
3 Register Descriptions: PCI Bridges

3.1 LPC ISA Bridge (Device 20, Function 3)

Note: Some LPC functions are controlled by, and associated with, certain PCI configuration registers in the
SMBus/ACPI device. For more information refer to section 2.3: SMBus Module and ACPI Block (Device 20,
Function 0). The diagram below lists these LPC functions and the associated registers.

LPC

LPC Controller Enable
LPC Drive strength control
C0h
64h --
PCI_Reg:
3.1.1 Programming Interface
• Write LPC_enable bit in function 0, register 64, bit 20.
• Enable LPC address decode ranges.
• Program DMA controller for any bus master or DMA cycles.
• Perform LPC cycles from PCI or DMA requests from LPC agent.
3.1.2 PCI Configuration Registers
The LPC host controller supports a set of configuration register required by the PCI specification.
Registers not listed here will have this default behavior: read from the register returns 0’s; write to the
register is ignored.
Register Name Offset Address
VID 00h
DID 02h
CMD 04h
STATUS 06h
Revision ID/Class Code 08h
Cache Line Size 0Ch
Latency Timer 0Dh
Header Type 0Eh
BIST 0Fh
Base Address Reg 0 10h
Subsystem ID & Subsystem Vendor ID 2Ch
Capabilities Pointer 34h
PCI Control 40h
IO Port Decode Enable Register 1 44h
IO Port Decode Enable Register 2 45h
IO Port Decode Enable Register 3 46h
IO Port Decode Enable Register 4 47h
IO/Mem Port Decode Enable Register 5 48h
LPC Sync Timeout Count 49h
IO/Mem Port Decode Enable Register 6 4Ah
Memory Range Register 4Ch
Rom Protect 0 50h