Intel B940 Datasheet Page 327

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Datasheet, Volume 2 327
Processor Configuration Registers
2.19.45 RSTS—Root Status
This register provides information about PCI Express Root Complex specific
parameters.
2.19.46 PEGLC—PCI Express-G Legacy Control Register
This register controls functionality that is needed by Legacy (non-PCI Express aware)
OSs during run time.
B/D/F/Type: 0/6/0/PCI
Address Offset: C0–C3h
Reset Value: 00000000h
Access: RO, RW1C
Bit Attr
Reset
Value
Description
31:18 RO 0000h
Reserved: MBZ
For future R/WC/S implementations; software must use 0 for writes to bits.
17 RO 0b
PME Pending (PMEP)
This bit indicates that another PME is pending when the PME Status bit is set.
When the PME Status bit is cleared by software; the PME is delivered by
hardware by setting the PME Status bit again and updating the Requestor ID
appropriately. The PME pending bit is cleared by hardware if no more PMEs
are pending.
16 RW1C 0b
PME Status (PMES)
This bit indicates that PME was asserted by the requestor ID indicated in the
PME Requestor ID field. Subsequent PMEs are kept pending until the status
register is cleared by writing a 1 to this field.
15:0 RO 0000h
PME Requestor ID (PMERID)
This bit indicates the PCI requestor ID of the last PME requestor.
B/D/F/Type: 0/6/0/PCI
Address Offset: EC–EFh
Reset Value: 0000_0000h
Access: RO, RW
Bit Attr
Reset
Value
Description
31:3 RO 00..00b Reserved
2RW 0b
PME GPE Enable (PMEGPE)
0 = Do not generate GPE PME message when PME is received.
1 = Generate a GPE PME message when PME is received (Assert_PMEGPE
and Deassert_PMEGPE messages on DMI). This enables the MCH to
support PMEs on the PEG port under legacy OSs.
1RW 0b
Hot-Plug GPE Enable (HPGPE)
0 = Do not generate GPE Hot-Plug message when Hot-Plug event is
received.
1 = Generate a GPE Hot-Plug message when Hot-Plug Event is received
(Assert_HPGPE and Deassert_HPGPE messages on DMI). This enables
the MCH to support Hot-Plug on the PEG port under legacy OSs.
0RW 0b
General Message GPE Enable (GENGPE)
0 = Do not forward received GPE assert/de-assert messages.
1 = Forward received GPE assert/de-assert messages. These general GPE
message can be received using the PEG port from an external Intel
device (that is, PxH) and will be subsequently forwarded to the PCH
(using Assert_GPE and Deassert_GPE messages on DMI). For example,
PxH might send this message if a PCI Express device is hot plugged into
a PxH downstream port.
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