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Universal Serial Bus (USB) Configuration
13-6 Intel® 460GX Chipset Software Developer’s Manual
13.2.13 INTPN–Interrupt Pin (Function 2)
Address Offset: 3Dh
Default Value: 04h
Attribute: Read only
This register indicates which PCI interrupt pin is used for the USB module interrupt. The USB
interrupt is internally ORed to the interrupt controller with the PIRQD# signal.
13.2.14 Miscellaneous Control (Function 2)
Address Offset: 6A-6Bh
Default Value: 0000h
Attribute: Read/Write
13.2.15 SBRNUM–Serial Bus Release Number (Function 2)
Address Offset: 60h
Default Value: 10h
Attribute: Read only
This register contains the release of the USB Specification with which this USB Host Controller
module is compliant.
13.2.16 LEGSUP–Legacy Support Register (Function 2)
PCI Address Offset: C0-C1h
Default: 2000h
Attribute: Read/Write Clear
This register provides control and status capability for the legacy keyboard and mouse Functions.
Bit Description
7:3 Reserved.
2:0 Serial Bus Module Interrupt Routing. The value of 04h in Function 2 indicates that the IFB will
drive PIRQD# as its interrupt line for the USB controller.
Bit Description
15:2 Reserved.
1 Low Speed PreSOF Disable. This bit should be set to ‘1’ to disable.
0 Reserved.
Bit Description
7:0 Serial Bus Specification Release Number. All other combinations are reserved.
Bits[7:0] Release Number
00h Pre-release 1.0
10h Release 1.0