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SM Bus Controller Configuration
14-4 Intel® 460GX Chipset Software Developer’s Manual
14.2.6 CLASSC–Class Code Register (Function 3)
Address Offset: 09-0Bh
Default Value: 0C0500h
Attribute: Read only
This register identifies the Base Class Code, Sub-Class Code, and Device Programming interface
for IFB PCI Function 3.
14.2.7 SMBBA–SMBus Base Address (Function 3)
Address Offset: 20-23h
Default Value: 00000001h
Attribute: Read/Write
This register contains the base address of the SMBus I/O Registers.
14.2.8 SVID–Subsystem Vendor ID (Function 3)
Address: 2C-2Dh
Default Value: 0000h
Attribute: Read only
Bit Description
23:16 Base Class Code (BASEC). 0Ch = Serial Bus Controller.
15:8 Sub-Class Code (SCC). 05h = System Management Bus (SMBus) Controller.
7:0 Programming Interface (PI). 00h = No specific register level programming defined.
Bit Description
31:16 Reserved. Hardwired to 0s. Must be written as 0s.
15:4 Index Register Base Address. Bits [15:4] correspond to I/O address signals AD [15:4],
respectively.
3:1 Reserved. Read as 0.
0 Resource Type Indicator (RTE)–RO. This bit is hardwired to 1 indicating that the base address
field in this register maps to I/O space.
Bit Description
15:0 Subsystem Vendor ID.