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Intel® 460GX Chipset Software Developer’s Manual 14-5
SM Bus Controller Configuration
14.2.9 SID–Subsystem ID (Function 3)
Address: 2E-2Fh
Default Value: 0000h
Attribute: Read only
14.2.10 INTLN–Interrupt Line Register (Function 3)
Address Offset: 3Ch
Default Value: 00h
Attribute: Read/Write
Software programs this register with interrupt information concerning the Power Management
module.
14.2.11 INTPN–Interrupt Pin (Function 3)
Address Offset: 3Dh
Default Value: 02h
Attribute: Read only
This register indicates that PCI interrupt PIRQB# is used for the Power Management module.
14.2.12 Host Configuration
Address Offset: 40h
Default Value: 00h
Attribute: Read/Write
Bit Description
15:0 Subsystem ID.
Bit Description
7:0 Interrupt Line. The value in this register has no affect on IFB hardware operations.
Bit Description
7:3 Reserved.
2:0 Serial Bus Module Interrupt Routing. This field is hardwired to 02h to indicate that PCI
interrupt pin PIRQB# is used.
Bit Description
7:2 Reserved.
1 SMI_EN: When this bit is set, any source of an SMB interrupt will instead be routed to generate
an SMI#. This bit will only take effect if the INTREN bit is set in I/O space.
0 HST_EN: When set, the SMB Host Controller interface is enabled to execute commands. The
HST_INT_EN bit needs to be enabled in order for the SMB Host Controller to interrupt or SMI#.
Additionally, the SMB Host Controller will not respond to any new requests until all interrupt
requests have been. The HST_EN bit does not affect the SMB Slave Port.