mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 261

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
Chapter 12
Universal Serial Bus (USB)
This chapter provides an overview of the USB module of the MCF5272, including detailed
operation information and the USB programming model. Connection examples and circuit
board layout considerations are also provided.
The USB Specification, Revision 1.1 is a recommended supplement to this chapter. It can
be downloaded from http://www.usb.org. Chapter 2 of this specification, Terms and
Abbreviations, provides definitions of many of the terms found here.
12.1 Introduction
The universal serial bus (USB) is an industry-standard extension to the PC architecture. The
USB controller on the MCF5272 supports device mode data communication between itself
and a USB host device, typically a PC. One host and up to 127 attached peripherals share
USB bandwidth through a host-scheduled, token-based protocol. The USB uses a tiered star
topology with a hub at the center of each star, as shown in Figure 12-1. Each wire segment
is a point-to-point connection between the host A connector and a peripheral B connector.
Unless otherwise stated, all mention of the USB specification
refers to revision 1.1.
Chapter 12. Universal Serial Bus (USB)
NOTE:
12-1