USB_30_HUB_DESCRIPTOR structure (usbspec.h)

The USB_30_HUB_DESCRIPTOR structure contains a SuperSpeed hub descriptor. For information about the structure members, see Universal Serial Bus Revision 3.0 Specification, 10.13.2.1 Hub Descriptor, Table 10-3. SuperSpeed Hub Descriptor.

Syntax

typedef struct _USB_30_HUB_DESCRIPTOR {
  UCHAR  bLength;
  UCHAR  bDescriptorType;
  UCHAR  bNumberOfPorts;
  USHORT wHubCharacteristics;
  UCHAR  bPowerOnToPowerGood;
  UCHAR  bHubControlCurrent;
  UCHAR  bHubHdrDecLat;
  USHORT wHubDelay;
  USHORT DeviceRemovable;
} USB_30_HUB_DESCRIPTOR, *PUSB_30_HUB_DESCRIPTOR;

Members

bLength

The length, in bytes, of the descriptor.

bDescriptorType

The descriptor type. For SuperSpeed hub descriptors, the value must be USB_30_HUB_DESCRIPTOR_TYPE (0x2A).

bNumberOfPorts

The number of ports on the hub.

wHubCharacteristics

The hub characteristics.

bPowerOnToPowerGood

The time, in 2-millisecond intervals, that it takes the device to turn on completely.

bHubControlCurrent

The maximum current requirements, in milliamperes, of the controller component of the hub.

bHubHdrDecLat

The hub packet header decode latency.

wHubDelay

The average delay, in nanoseconds, that is introduced by the hub.

DeviceRemovable

Indicates whether a removable device is attached to each port.

Requirements

Requirement	Value
Minimum supported client	Windows 8
Minimum supported server	None supported
Header	usbspec.h

See also

USB Structures

USB_HUB_INFORMATION_EX