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IRB_REQ_SET_DEVICE_XMIT_PROPERTIES structure (1394.h)

  • Article

This structure contains the fields necessary to carry out a SetDeviceXmitProperties request.

Syntax

typedef struct _IRB_REQ_SET_DEVICE_XMIT_PROPERTIES {
  ULONG fulSpeed;
  ULONG fulPriority;
} IRB_REQ_SET_DEVICE_XMIT_PROPERTIES;

Members

fulSpeed

Specifies the maximum speed for transactions to the device. The possible speed values are SPEED_FLAGS_xxx, where xxx is the (approximate) transfer rate in megabits per second. Existing hardware supports transfer rates of 100, 200, and 400 Mb/sec.

Transfer Rate Description
SPEED_FLAGS_100 100 Mb/s
SPEED_FLAGS_200 200 Mb/s
SPEED_FLAGS_400 400 Mb/s
 

Reserved.

Note  In Windows 7 and later versions of Windows, you can specify new values higher speed and greater sized payloads. For more information, see New Flags for Speed and Payload Size and IEEE 1394 IOCTL Changes in Device Driver Interface (DDI) Changes in Windows 7.
 

fulPriority

Specifies the priority.

Remarks

By default, the maximum permitted transmission speed is the physical maximum. A driver should use this request to lower the maximum permitted speed.

Requirements

Requirement Value
Header 1394.h