Intel 460GX 8.2IHPC Memory Mapped Registers, 8.1.21Arbiter SERR Status, 8.1.22Memory Access Index, 8.1.23Memory Mapped Register Access Port

WXB Hot-Plug

8.1.21Arbiter SERR Status

Address Offset:		4A	Size:	8 bits
Default Value:		00h	Attribute:	Partial Read/Write
Bits	Description
7:0	reserved (0)

8.1.22Memory Access Index

Address Offset:	50h-53h	Size:	32 bits
Default Value:	00000000h	Attribute:	Partial Read/Write

When the “Enable PCI Config Space Access to Hot-Plug Registers” bit in the Miscellaneous Hot- Plug Configuration Register is set, this register becomes a pointer into the IHPC memory mapped register space (divided into 64, 32-bit Dwords).

Bits Description

31:8 reserved (0)

7:2 Hot-Plug Memory Access Index

Read/Write

1:0 reserved (0)

8.1.23Memory Mapped Register Access Port

Address Offset:	54h-57h	Size:	32 bits
Default Value:	00000000h	Attribute:	Read/Write

When the “Enable PCI Config Space Access to Hot-Plug Registers” bit in the Miscellaneous Hot- Plug Configuration Register is set, this register becomes mapped into the IHPC memory mapped register space at the location pointed to by the Memory Index Register.

Bits Description

31:0 Memory Mapped Register Access Port

8.2IHPC Memory Mapped Registers

Each IHPC reserves 256 bytes of memory mapped registers. A list of those registers follows. Unlike other register descriptions in this document, the offset listed is always Dword aligned with bit offset provided. This nomenclature is used to be consistent with the Memory Access Index Register in IHPC configuration space. The default power-up value is included in each register description heading.

8-10 Intel® 460GX Chipset Software Developer’s Manual