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1 University of Pune S.E. I.T. Subject code: Computer Organization Part 35 : Universal Serial Bus UNIT V Tushar B. Kute, Department of Information Technology, Sandip Institute of Technology & Research Centre, Nashik.
2 USB Universal Serial Bus (USB) is a specification to establish communication between devices and a host controller (usually personal computers), developed and invented by Ajay Bhatt while working for Intel. USB is intended to replace many varieties of serial and parallel ports. USB can connect computer peripherals such as mice, keyboards, digital cameras, printers, personal media players, flash drives, Network Adapters, and external hard drives. For many of those devices, USB has become the standard connection method. USB was designed for personal computers, but it has become commonplace on other devices such as smartphones, PDAs and video game consoles, and as a power cord. As of 2008, there are about 2 billion USB devices sold per year, and approximately 6 billion total sold to date. Source: Wikipedia free encyclopaedia.
3 Historical Background-1 The Universal Serial Bus (USB) is a standard for peripheral devices. It began development in 1994 by a group of seven companies: Compaq, DEC, IBM, Intel, Microsoft, NEC and Nortel. USB was intended to make it fundamentally easier to connect external devices to PCs by replacing the multitude of connectors at the back of PCs, addressing the usability issues of existing interfaces, and simplifying software configuration of all devices connected to USB, as well as permitting greater bandwidths for external devices. The first silicon for USB was made available by Intel in 1995
4 Historical Background-2 The USB 1.0 specification was introduced in January The original USB 1.0 specification had a data transfer rate of 12 Mbit/s. The first widely used version of USB was 1.1, which was released in September It allowed for a 12 Mbit/s data rate for higher-speed devices such as disk drives, and a lower 1.5 Mbit/s rate for low bandwidth devices such as joysticks.
5 Historical Background-3 The USB 2.0 specification was released in April 2000 and was standardized by the USB-IF at the end of Hewlett-Packard, Intel, Lucent Technologies (now Alcatel-Lucent following its merger with Alcatel in 2006), NEC and Philips jointly led the initiative to develop a higher data transfer rate, with the resulting specification achieving 480 Mbit/s, a fortyfold increase over 12 Mbit/s for the original USB 1.0.
6 USB features Simple Connectivity. Simple Cables. One interface for many devices. Automatic Configuration. No user setting. Free hardware resources for other devices. Hot Pluggable.
7 USB features Speed. Reliability (hardware design and data transfer protocols). Less power consumption. Flexibility Operating System support Peripheral Support
8 USB Logo
9 USB Connector
10 USB Connectors
11 Connector Configuration
12 USB 1.x/2.0 standard pinning Pin Name Cable color Description 1 VCC Red +5 V 2 D White Data 3 D+ Green Data + 4 GND Black Ground USB 1.x/2.0 Mini/Micro pinning Pin Name Cable colour Description 1 VCC Red +5 V 2 D White Data 3 D+ Green Data + 4 ID none permits distinction of A plug from B plug * A plug: connected to Signal Ground * B plug: not connected 5 GND Black Signal Ground
13 USB 3.0
14 USB Data USB data signals are bi-phase signals. Usually, IC from Texas instruments is used as both the differential line driver and receiver. The USB uses NRZI (Non-Return to Zero Inverted) data encoding method for transmitting data packets. In this method, the signal level does not change for the transmission of logic 1. However, it is inverted for each change to a logic 0.
15 USB interface using CMOS buffers
16 NRZI encoding scheme
17 Bit Stuffing
18 USB Commands
19 Packet Formats
20 Data Transfer Types Control Transfer Bulk Transfer Interrupt Transfer Isochronous Transfer
21 IEEE 488
22 General Purpose Interface Bus Talkers: Capable of putting the data on the bus for transmission e.g. tape readers, digital voltmeters, frequency counters. Listeners: Capable of reading the data on the bus output by talkers e.g. printers, display devices. Controllers: Determines who talks and who listens on the bus e.g. program devices on bus.
23 References Websites: Computer Architecture and Organization By A. P. Godse (from books.google.com ) Computer Organization By Hamacher and Zaky
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