MCF5253 Reference Manual, Rev. 1Freescale Semiconductor 24-1Chapter 24Universal Serial Bus InterfaceThis chapter describes the universal serial bus (USB) interface of the MCF5253. The content includes theoperation, signal descriptions, host data structures, and host operations. Also provided is the deviceoperational model and deviations from the host mode of operation.NOTEPortions of this chapter, “Universal Serial Bus Interface,” that relate to the EHCI specification areCopyright © Intel Corporation 1999–2001. The EHCI specification is provided “As Is” with nowarranties whatsoever, including any warranty of merchantability, non-infringement, fitness forany particular purpose, or any warranty otherwise arising out of any proposal, specification orsample. Intel disclaims all liability, including liability for infringement of any proprietary rights,relating to use of information in the EHCI specification. Intel may make changes to the EHCIspecifications at any time, without notice.The USB interface implements many industry standards. However, it is beyond the scope of this documentto document the intricacies of these standards. Instead, it is left to the reader to refer to the governingspecifications.The following documents are available from the USB Implementers Forum web page athttp://www.usb.org/developers/docs/• Universal Serial Bus Specification, Revision 2.0• On-The-Go Supplement to the USB 2.0 Specification, Revision 1.0aThe following documents are available from the Intel USB Specifications web page athttp://www.intel.com/technology/usb/spec.htm• Enhanced Host Controller Interface Specification for Universal Serial Bus, Revision 1.0• USB 2.0 Transceiver Macrocell Interface (UTMI) Specification, Version 1.0524.1 FeaturesThe USB OTG module includes the following features:• Complies with USB specification rev 2.0• Supports operation as a standalone USB host controller— Supports enhanced host controller interface (EHCI)• USB device mode• USB On-The-Go mode including host capability• Supports high-speed (480 Mbps), full-speed (12 Mbps), and low-speed host (1.5 Mbit/s) operations• Supports internal PHY (with UTMI+ interface)
