Freescale Semiconductor MPC8313E Family Reference Manual page 944

Universal Serial Bus Interface
16.1.1 Overview
The USB DR module is a USB 2.0-compliant serial interface engine for implementing a USB interface.
The registers and data structures for the module are based on the Enhanced Host Controller Interface
Specification for Universal Serial Bus (EHCI) from Intel Corporation. The DR module can act as a device
or host controller. Interfaces to negotiate the host or device role on the bus in compliance with the
On-The-Go (OTG) supplement to the USB specification are also provided.
The DR module supports the required signaling for USB transceiver macrocell interface (UTMI) and
UTMI low pin count interface (ULPI) transceivers (PHYs). The PHY interfacing to the UTMI is an
internal PHY, and the PHY interfacing to the ULPI is an external PHY.
The module contains a chaining DMA (direct memory access) engine that reduces the interrupt load on
the application processor and reduces the total system bus bandwidth that must be dedicated to servicing
the USB interface requirements.
16.1.2 Features
The USB DR 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)
• Supports high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) operation. Low
speed is only supported in host mode.
MPC8313E PowerQUICC II Pro Integrated Processor Family Reference Manual, Rev. 3
16-2
Dual-Role
Module
(DR)
Figure 16-1. USB Interface Block Diagram
CSB
TX Buffer
RX Buffer
On-Chip PHY
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