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SM Bus Controller Configuration
14-2 Intel® 460GX Chipset Software Developer’s Manual
14.2 System Management Register Descriptions
This section describes in detail the registers associated with the IFB System Management Function.
14.2.1 VID–Vendor Identification Register (Function 3)
Address Offset: 00–01h
Default Value: 8086h
Attribute: Read only
The VID Register contains the vendor identification number. This register, along with the Device
Identification Register, uniquely identifies any PCI device. Writes to this register have no effect.
14.2.2 DID–Device Identification Register (Function 3)
Address Offset: 02-03h
Default Value: 7603h
Attribute: Read only
The DID Register contains the device identification number. This register, along with the VID
Register, defines the IFB Power Management Controller. Writes to this register have no effect.
14.2.3 PCICMD–PCI Command Register (Function 3)
Address Offset: 04-05h
Default Value: 00h
Attribute: Read/Write
This register controls access to the I/O space registers.
Bit Description
15:0 Vendor Identification Number. This is a 16-bit value assigned to Intel.
Bit Description
15:0 Device Identification Number. This is a 16-bit value assigned to the IFB System Management
Controller.
Bit Description
15:10 Reserved. Read 0.
9 Fast Back to Back Enable (Not Implemented). This bit is hardwired to 0.
8:5 Reserved. Read as 0.
4 Memory Write and Invalidate Enable (Not Implemented). This bit is hardwired to 0.
3 Special Cycle Enable (SCE). 1 = Enable, the IFB recognizes the Stop Grant special cycle.
0=Disable. The SCE bit in Function 1 PCI Command register controls IFB response to the
Shutdown special cycle.
2 Bus Master Enable (Not Implemented). This bit is hardwired to 0.