TAILIEUCHUNG - USB Complete fourth- P49

USB Complete fourth- P49:This book focuses on Windows programming for PCs, but other computers and operating systems also have USB support, including Linux and Apple Computer’s Macintosh. Some real-time kernels also support USB. | Chapter 19 Two USB-IF standards for this type of interface are the Inter-Chip USB Supplement for low and full speeds and the High-Speed Inter-Chip USB Electrical Specification for high speed. For both interface types all of the following are true The distance between the host and peripheral is 10 cm or less. The host doesn t allow peripheral attachment or removal while the inter-chip supply voltage is present. The interface can use a vendor-specific cable or on-board connection circuit-board traces . An interface that complies with the Inter-Chip USB Supplement must meet these requirements The host always supports full speed and supports low speed if the host communicates with a low-speed peripheral. The peripheral may support low or full speed. The interface supports one or more of six defined supply-voltage classes with nominal voltages in the range 1 3V The low full speed interface draws no bus current when idle. To save additional power hardware can switch out the bus pull-up and pull-down resistors during traffic signaling. The High-Speed Inter-Chip USB Electrical Specification defines an interface that uses a high-speed inter-chip HSIC synchronous serial interface. The interface uses 240-MHz double data rate DDR signaling which transfers data on both the rising and falling clock edges. A 240-Mhz clock thus supports a 480-Mbps bit rate. An interface that complies with the High-Speed Inter-Chip USB Electrical Specification must meet these requirements The host and peripheral support high speed. The interface uses LVCMOS voltages. The HSIC interface consumes power only when a transfer is in progress. USB To support SuperSpeed USB adds transmitters and receivers and modifies the cables and connectors to carry the SuperSpeed signals. 456 The Electrical and Mechanical Interface Transmitters and Receivers For SuperSpeed each direction has a dedicated pair of wires with a differential transmitter at one end and a differential receiver at the opposite .

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