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MPC8280 Datasheet(PDF) 818 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 818 Page - Freescale Semiconductor, Inc |
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818 / 1386 page  Universal Serial Bus Controller MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 27-2 Freescale Semiconductor 27.2.1 USB Controller Key Features The USB function mode features are as follows: • Four independent endpoints support control, bulk, interrupt, and isochronous data transfers • CRC16 generation and checking • CRC5 checking • NRZI encoding/decoding with bit stuffing • 12- or 1.5-Mbps data rate • Flexible data buffers with multiple buffers per frame • Automatic retransmission upon transmit error The USB host controller features are as follows: • Supports control, bulk, interrupt, and isochronous data transfers • CRC16 generation and checking • NRZI encoding/decoding with bit stuffing • Supports both 12- and 1.5-Mbps data rates (automatic generation of preamble token and data rate configuration). Note that low-speed operation requires an external hub. • Flexible data buffers with multiple buffers per frame • Supports local loopback mode for diagnostics (12 Mbps only) 27.3 Host Controller Limitations The following tasks are not supported by the hardware and must be implemented in software: • Scheduling the various transfers within and between frames • Retransmission after an error and error recovery • Incrementing the frame number and generating CRC5 for the SOF (Start of Frame) token once per frame (1 ms) Additionally, when using the packet-level interface described in Section 27.5.1.1, “Packet-Level Interface,” the tokens must be prepared by the software. Because the MPC8280 USB host controller does not integrate the root hub, an external hub is required when more than one device is connected to the host. Also note that the host controller programming model does not conform to the open host controller interface (OHCI) or universal host controller interface (UHCI) standards in which software drivers are hardware-independent. 27.3.1 USB Controller Pin Functions and Clocking The USB controller interfaces to the USB bus through a differential line driver and differential line receiver. The OE (output enable) signal enables the line driver when the USB controller transmits on the bus. |
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