USB 2005
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This document defines USB (Universal Serial Bus) and identifies its key features. It discusses the history and benefits of USB, identifies different USB types, and forecasts future sales growth. It compares USB to other interfaces like serial and parallel ports, noting USB's advantages in bandwidth, number of supported devices, bus power, cable length limits, plug-and-play capability, and hot swapping. The document also examines how USB flash drives can replace floppy disks through higher capacity, faster performance, and competitive pricing. It outlines USB architecture including cables, connectors, hubs and connections. Finally, it reviews the USB enumeration and data transfer processes and implementation.
USB 2005
- 1. USB A Truly Universal Bus for Computer Peripherals It is more than just an interface A.Elrahman Mohamed Selim 2nd yr Electronics
- 2. ObjectivesObjectives Defining the USB.Defining the USB. Identifying the USB types.Identifying the USB types. Identifying the future sales progress.Identifying the future sales progress. Identifying the comparison with otherIdentifying the comparison with other interfaces and devices.interfaces and devices. Identifying the USB Architecture.Identifying the USB Architecture. Recognizing the USB process andRecognizing the USB process and implementation.implementation.
- 4. USB DefinitionUSB Definition Universal:Universal: conveys the notion of being forconveys the notion of being for all thingsall things ““one plug fits allone plug fits all””.. Serial:Serial: describes the flow of information indescribes the flow of information in the bus.the bus. Bus:Bus: A bus is a data pathway connectingA bus is a data pathway connecting two or more devices. Busses are measuredtwo or more devices. Busses are measured by their speed in megahertz, and thereby their speed in megahertz, and there bandwidth in bits.bandwidth in bits.
- 5. IntroductionIntroduction History. Benefits. Merits: – Ease-of-use – Low-cost – Expandability & flexibility – Auto-configuration – Synergy with PC industry
- 7. Market ForecastMarket Forecast Source:Source: instatinstat/MDR 3/MDR 3--0404
- 8. USB vs. Serial & ParallelUSB vs. Serial & Parallel USB Serial Parallel Bandwidth 480 Mbps 115 Kbps 115 KBps EPP 3 MBps Number of devices 127 devices on a single USB bus Limited to the number of ports available on the computer. Limited to the number of ports available on the computer. Bus Power Can provide up to 500 mA at 5V No No CableLength Limit 5 m 3 m 1.8 m Plug'n'Play Yes No No HotSwapable Yes NO NO
- 9. UFD VersusUFD Versus Floppy Disk DrivesFloppy Disk Drives Floppy Disks are universal and cheap but have limitationsFloppy Disks are universal and cheap but have limitations –– Low capacityLow capacity : 1.44MB for 3.5: 1.44MB for 3.5”” (typical)(typical) –– Low performanceLow performance : Read / Write: 60kB/s / 60kB/s: Read / Write: 60kB/s / 60kB/s –– Low costLow cost : Drive + 10 Floppy Disks approx. 50L.E: Drive + 10 Floppy Disks approx. 50L.E –– EnvironmentalEnvironmental : Temp.: 5: Temp.: 5°° –– 5252°° CC USB Flash Drives could replace Floppy DisksUSB Flash Drives could replace Floppy Disks because ofbecause of –– Higher capacityHigher capacity : 16MB up to 1GB and more: 16MB up to 1GB and more –– Performance (Full)Performance (Full) : Read/Write: up to 1MB/s => ~15x faster: Read/Write: up to 1MB/s => ~15x faster –– Performance (Hi)Performance (Hi) : Read/Write: up to 6MB/s => ~ 100x faster: Read/Write: up to 6MB/s => ~ 100x faster –– Competitive costCompetitive cost : 64MB USB Flash Drive approx. 60L.E: 64MB USB Flash Drive approx. 60L.E –– EnvironmentalEnvironmental : Temp.: 0: Temp.: 0 –– 7070’’CC
- 14. USB ProcessUSB Process EnumerationEnumeration Types of Data Transfers to be performedTypes of Data Transfers to be performed –– ControlControl –– InterruptInterrupt –– BulkBulk –– IsochronousIsochronous Tracking the bandwidth requestedTracking the bandwidth requested
- 16. ConclusionConclusion USB devices are incredibly simple andUSB devices are incredibly simple and flexible!flexible! USB Technology is truly an amazingUSB Technology is truly an amazing system!system! Surely CATReloaded will develop a projectSurely CATReloaded will develop a project coco--operated with USB technologyoperated with USB technology ☺☺..