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Intel® 460GX Chipset Software Developer’s Manual 8-9
WXB Hot-Plug
11:8 reserved(0)
7 Enable PCI Configuration Space Access to Hot-Plug Registers. Enables IHPC memory-
mapped register access through the index register (configuration offset 50h) and data port
(configuration offset 54h).
6:2 reserved (0)
1 reserved (1)
0 On / Off Busy (OOBS) status. Read Only. Same as bit 24 of the memory-mapped Hot-
Plug Miscellaneous register.
8.1.18 Hot-Plug Features
Address Offset: 44h-45 Size: 16 bits
Default Value: 0000h Attribute: Read Only
Definitions of each bit within this register are expected to be constant through the industry but are,
as of yet, undefined.
Bits
Description
15:0 reserved (0)
8.1.19 Switch Change SERR Status
Address Offset: 48h Size: 8 bits
Default Value: 00h Attribute: Partial Read/Write
Bits
Description
7:6 reserved (0)
5:0 Switch Change SERR Status. Slot F is MSB. Slot A is LSB. Similar to the Power Fault
SERR status register, but applicable to switch changes when the switch interrupt redirect
bit for a slot is set and the associated interrupt mask bit is logic 0. Unlike the Power Fault
SERR status register, clearing this bit will also clear the associated interrupt.
8.1.20 Power Fault SERR Status
Address Offset: 49h Size: 8 bits
Default Value: 00h Attribute: Partial Read/Write
Bits
Description
7:6 reserved.
5:0 Power Fault SERR Status. If the power fault function enable bit and the SERR on power
fault bit are both set, then these six bits will indicate (by a logic 1, one for each slot) if a
power fault has occurred while a slot was connected to the bus or clock. Slot F is MSB.
Slot A is LSB. These bits can be cleared by writing a logic 1 to the appropriate position.
This register does not effect PCI interrupts.