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©2008 Advanced Micro Devices, Inc.
LPC ISA Bridge (Device 20, Function 3)
AMD SB600 Register Reference Manual Proprietary Page 252
Latency Timer - R - 8 bits - [PCI_Reg: 0Dh]
Field Name Bits Default Description
Latency Timer 7:0 00h Latency Timer.
Latency Timer Register: This register specifies the value of the Latency Timer in units of PCICLKs.
Header Type - R - 8 bits - [PCI_Reg: 0Eh]
Field Name Bits Default Description
Header Type 7:0 80h Header Type.
Header Type Register: This register identifies the type of the predefined header in the configuration space. Since
THE SB600 is a multifunction device, the most significant bit is set.
BIST- R - 8 bits - [PCI_Reg: 0Fh]
Field Name Bits Default Description
BIST 7:0 00h BIST.
Built-in Self Test Register: This register is used for control and status for Built-in Self Test. LPC has no BIST modes.
Base Address Reg 0- RW* - 32 bits - [PCI_Reg: 10h]
Field Name Bits Default Description
Base Address 0 31:0 FEC0_0000h Base address register 0.
This register is write-only. Reading it always returns 0000_0000h. It has an internal value used as base address for
APIC memory space. Writing to the register will change its internal value, but only bit[31:5] is overwritten, and
bit[4:0] is hardwired to 00000b. The default internal value is FEC0_0000h.
Subsystem ID & Subsystem Vendor ID – RW - 32 bits - [PCI_Reg: 2Ch]
Field Name Bits Default Description
Subsystem Vendor ID 15:0 0000h Subsystem Vendor ID.
Subsystem ID 31:16 0000h Subsystem ID.
This 4-byte register is a write-once & read-only afterward register. The BIOS writes this register once (all 4 bytes at
once) and software reads its value (when needed).
Capabilities Pointer - R - 32 bits - [PCI_Reg: 34h]
Field Name Bits Default Description
Capabilities Pointer 7:0 00h When reg0x78[1] (msi on) is 0, this field reads 0; when
reg0x78[1] is 1, this field reads 80h, pointing to the starting
address of MSI capability register
Reserved 31:8 000000h
PCI Control - RW - 8 bits - [PCI_Reg: 40h]
Field Name Bits Default Description
Reserved 1:0 0h
DMA Enable 2 0b Setting it to 1 enables lpc DMA cycle. Note: 32-bit DMA is not
supported. Transfer size: Channels 0-3: 8 bits, channels 5-7: 16
bits.
Reserved 7:3 00h
IO Port Decode Enable Register 1- RW - 8 bits - [PCI_Reg: 44h]
Field Name Bits Default Description
Parallel Port Enable 0 0 0b Port enable for parallel port, 378-37fh
Parallel Port Enable 1 1 0b Port enable for parallel port, 778-77fh
Parallel Port Enable 2 2 0b Port enable for parallel port, 278-27fh
Parallel Port Enable 3 3 0b Port enable for parallel port, 678-67fh
Parallel Port Enable 4 4 0b Port enable for parallel port, 3bc-3bfh