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This document presents an overview of Universal Serial Bus 3.0 architecture and key concepts.
USB 3.0 is similar to earlier versions of USB in that it is a cable bus supporting data exchange
between a host computer and a wide range of simultaneously accessible peripherals. The attached
peripherals share bandwidth through a host-scheduled protocol. The bus allows peripherals to be
attached, configured, used, and detached while the host and other peripherals are in operation.
USB 3.0 utilizes a dual-bus architecture that provides backward compatibility with USB 2.0. It
provides for simultaneous operation of SuperSpeed and non-SuperSpeed (USB 2.0 speeds)
information exchanges. This chapter is organized into two focus areas. The first focuses on
architecture and concepts related to elements which span the dual buses. The second focuses on
SuperSpeed specific architecture and concepts.
Later chapters describe the various components and specific requirements of SuperSpeed USB in
greater detail. The reader is expected to have a fundamental understanding of the architectural
concepts of USB 2.0. Refer to the Universal Serial Bus Specification, Revision 2.0 for complete
details.