Universal Serial Bus Device Class Specification for Device Firmware Upgrade

This document describes proposed requirements and specifications for Universal Serial Bus (USB)
devices that support the Device Firmware Upgrade (DFU) capability.
1.1 Related Documents
The following related documents are available from WWW.USB.ORG:
·? Universal Serial Bus Specification 1.0, January 19, 1996
·? Universal Serial Bus Common Class Specification 1.0, December 16, 1997
1.2 Terms and Abbreviations
The meanings of some words have been stretched to suit the purposes of this document. These
definitions are intended to clarify the discussions that follow.
DFU (n) Device Firmware Upgrade
Firmware (n) Executable software stored in a write-able, nonvolatile memory on a USB device.
Upgrade
(v) To overwrite the firmware of a device.
(n)(1) The act of overwriting the firmware of a device.
(n)(2) New firmware intended to replace a device’s existing firmware.
Download (v) To transmit information from host to device.
Upload (v) To transmit information from device to host.