82870P2P64H2 Datasheet, PDF (91/217 Pages) –

Register Description
R
3.3.2.9
HMIN—Hot Plug Non-Interrupt Inputs Register
Offset:
14–17h
Default Value: 00h
Attribute:
Size:
RO
32 bits
This register reflects the current state of bytes 4 through 7 of the serial input chain. Changes in the
states of these bits cannot be enabled to generate interrupts. The Input Scan Complete bit of the
MCNF Register in memory space determines if this register contains fresh data.
Bits
Description
31:22
21:16
15:14
13:8
7:6
5:0
Reserved
PCIXCAP2 Status. Using these bits, software can determine if a new card installed in a slot is
capable of running at 133 MHz PCI-X mode or only 66 MHz PCI-X mode, assuming the slot can
be run in PCI-X mode (by reading bits[13:8]. Bit 21 represents slot F, Bit 20 represents slot E,
etc.
Reserved
PCIXCAP1 Status. Using these bits, software can determine if a new card installed in a slot is
capable of running in PCI-X mode. Bit 13 represents slot F, Bit 12 represents slot E, etc.
Reserved
Slot is 66 MHz Capable (M66EN). Using these bits, software can determine if a new card
installed in a slot is capable of running at 66 MHz. Bit 5 represents slot F, Bit 4 represents slot E,
etc. until Bit 0, which represents slot A.
3.3.2.10
SID—Slot ID Register
Offset:
28h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
This register indicates which slots in the system support hot plug. It has no influence on the
behavior of the logic. The contents of this register should be maintained by the OS/BIOS and
should always be identical to the contents of the register of the same name in configuration space.
Bits
Description
7:4 Starting Slot Number (SSN). Starting physical slot number that supports hot plug.
3:0 Number of Slots (NUM). Number of hot plug slots controlled by the Intel® P64H2.
3.3.2.11
SIRE—Switch Interrupt Redirect Enable Register
Offset:
2Ch
Default Value: 00h
Attribute:
Size:
R/W
8 bits
These bits redirect slot switch change interrupts to SERR# instead of an interrupt.
Bits
Description
7:6 Reserved. This field is R/W for legacy compatibility.
5:0
Slot Interrupt Redirect Enable (RE). Bit 5 represents slot F, Bit 4 slot E, etc. until Bit 0, which
represents slot A. When set, switch change interrupts to cause the SERR# pin to be asserted.
Intel^® 82870P2 P64H2 Datasheet
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