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PCI_EXPRESS_SLOT_STATUS_REGISTER union (ntddk.h)

  • Article

The PCI_EXPRESS_SLOT_STATUS_REGISTER structure describes a PCI Express (PCIe) slot status register of a PCIe capability structure.

Syntax

typedef union _PCI_EXPRESS_SLOT_STATUS_REGISTER {
  struct {
    USHORT AttentionButtonPressed  :1;
    USHORT PowerFaultDetected  :1;
    USHORT MRLSensorChanged  :1;
    USHORT PresenceDetectChanged  :1;
    USHORT CommandCompleted  :1;
    USHORT MRLSensorState  :1;
    USHORT PresenceDetectState  :1;
    USHORT ElectromechanicalLockEngaged  :1;
    USHORT DataLinkStateChanged  :1;
    USHORT Rsvd  :7;
  };
  USHORT AsUSHORT;
} PCI_EXPRESS_SLOT_STATUS_REGISTER, *PPCI_EXPRESS_SLOT_STATUS_REGISTER;

Members

DUMMYSTRUCTNAME

DUMMYSTRUCTNAME.AttentionButtonPressed

A single bit that indicates that the attention button for the slot is being pressed.

DUMMYSTRUCTNAME.PowerFaultDetected

A single bit that indicates that a power fault at the slot has been detected.

DUMMYSTRUCTNAME.MRLSensorChanged

A single bit that indicates that the state of the slot's manually operated retention latch (MRL) sensor has changed.

DUMMYSTRUCTNAME.PresenceDetectChanged

A single bit that indicates that the card presence detection state for the slot has changed.

DUMMYSTRUCTNAME.CommandCompleted

A single bit that indicates that a command has been completed by the slot's hot-plug controller.

DUMMYSTRUCTNAME.MRLSensorState

The slot's manually operated retention latch (MRL) sensor state. Possible values are:

MRLClosed

The MRL is closed.

MRLOpen

The MRL is open.

DUMMYSTRUCTNAME.PresenceDetectState

The slot's card presence detection state. Possible values are:

SlotEmpty

The slot is empty.

CardPresent

A card is present in the slot.

DUMMYSTRUCTNAME.ElectromechanicalLockEngaged

A single bit that indicates if the slot's electromechanical interlock is engaged.

DUMMYSTRUCTNAME.DataLinkStateChanged

A single bit that indicates that the data link layer active bit of the PCIe link status register of the PCIe capability structure has changed.

DUMMYSTRUCTNAME.Rsvd

Reserved.

AsUSHORT

A USHORT representation of the contents of the PCI_EXPRESS_SLOT_STATUS_REGISTER structure.

Remarks

The PCI_EXPRESS_SLOT_STATUS_REGISTER structure is available in Windows Server 2008 and later versions of Windows.

A PCI_EXPRESS_SLOT_STATUS_REGISTER structure is contained in the PCI_EXPRESS_CAPABILITY structure.

Requirements

Requirement Value
Header ntddk.h (include Ntddk.h, Miniport.h)

See also

PCI_EXPRESS_CAPABILITY