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This structure contains the fields necessary for the 1394 bus driver to carry out an asynchronous write request.
nNumberOfBytesToStreamSpecifies the number of bytes to write.
fulFlagsReserved. Drivers must set this to zero.
MdlSpecifies the source buffer.
ulTagSpecifies the Tag field for any packets generated from this request.
nChannelSpecifies the channel to which the data will be written.
ulSynchSpecifies the Sy field for any packets generated from this request.
ReservedReserved. Drivers must set this to zero.
nSpeedSpecifies the transfer rate. The possible speed values are SPEED_FLAGS_xxx, where xxx is the (approximate) transfer rate in megabits per second. Existing hardware currently 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 |
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.