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8/2/2019 Usb3.0 Report Cover Pages
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Dept. of Electronics & Comm. Engineering
JIET, Jodhpur
A Seminar Report
On
UNIVERSAL SERIAL BUS 3.0(SUPER SPEED USB)
Submitted by
PAWAN TAK
in partial fulfillment for the award of the degree
of
BACHELOR OF TECHNOLOGY (B.TECH.)
IN
ELECTRONICS AND COMMUNICATION ENGINEERING
UNDER THE GUIDANCE OF
PROF. GEETIKA MATHUR
At
JODHPUR INSTITUTE OF ENGINEERING AND TECHNOLOGY
MOGRA, N.H. 65, PALI ROAD,JODHPUR-342001
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JODHPUR INSTITUTE OF TECHNOLGY
DEPARTMENT OF ELECTRONICS &
COMMUNICATION
CERTIFICATE
This is to certify that the following student:
PAWAN TAK (08EJIEC077)
have successfully completed the Seminar Titled " UNIVERSAL SERIAL BUS 3.0(SUPER
SPEED USB) under the guidance of prof. GEETIKA MATHUR towards the partial
fulfillment of degree of Bachelor of Engineering in Electronics and Communications of
the Rajasthan Technical University, Kota during academic year 2011 - 2012.
. .
Prof. O. P. Vyas Head of
Dept.
(Dean Engineering, JIET)
(Name/Designation)
.. ..
INTERNAL EXAMINER EXTERNAL
EXAMINER
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(Name/ Designation) (Name/
Designation)
Acknowledgement
This seminar was a short period in the long journey of research in life. I owe a deep
sincere of gratitude to respected Prof. O.P VYAS Sir, Dean Engg., JIET Jodhpur, for
permitting us to carry out the present work.
I am highly obliged and grateful to Prof. K.K ARORA Sir and Prof. SANJAY
BHANDARI Sir, H.O.D. ECE Departmentfor their inspiration and support.
I express my sincere and humble thanks to Prof. GEETIKA MATHUR Maam
,DEPUTY H.O.D. ECE Department, for their expert guidance, friendly disposition and
relentless effort throughout the work.
Last but not the least; I would be failing my duties if i could not express my gratitude
to all my colleagues.
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ABSTRACT
In information technology, Universal Serial Bus (USB) is a serial bus standard to connect
devices to a host computer. USB was designed to allow many peripherals to be connected using a
single standardized interface socket and to improve plug and play capabilities by allowing hot
swapping; that is, by allowing devices to be connected and disconnected without rebooting the
computer or turning off the device. Other convenient features include providing power to low-
consumption devices, eliminating the need for an external power supply; and allowing many
devices to be used without requiring manufacturer-specific device drivers to be installed.
The USB 3.0 is the upcoming version of the Universal Serial Bus (USB). The
specification of the new standard had been announced by USB Implementers Forum (USB-IF).
The main feature of the new USB is the raw throughput is 500 MByte/s. The new USB is also
capable to provide more power to drive the devices. USB 3.0 is highly backward compatible that
is, it is capable of operating with the current USBs which is USB 2.0
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1. Contents
ACKNOWLEDGEMNT -------------------------------------------------------------------3
ABSTRACT----------------------------------------------------------------------------------4
1. CONTENTS----------------------------------------------------------------------------5
2. INTRODUCTION----------------------------------------------------------------------6
3. APPLICATIONS----------------------------------------------------------------------52
4. ADVANTAGES-----------------------------------------------------------------------54
5. DISADVANTAGES------------------------------------------------------------------55
6. FUTURE TRENDS-------------------------------------------------------------------56
7. REFERENCES---------------------------------------------------------------------- 57
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INTRODUCTION
Universal Serial Bus (USB) is a serial bus standard to connect devices to a host
computer. The USB3.0 is the upcoming version of the USB. The USB 3.0 is also called super
speed USB. Because the USB 3.0 support a raw throughput of 500MByte/s. As its previous
versions it also support the plug and play capability, hot swapping etc. USB was designed to
allow many peripherals to be connected using a single standardized interface socket. . Other
convenient features include providing power to low-consumption devices, eliminating the need
for an external power supply; and allowing many devices to be used without requiring manufac
turer-specific device drivers to be installed.
There are many new features included in the new Universal Serial Bus Specification. The
most im portant one is the supers speed data transfer itself. Then the USB 3.0 can support more
devices than the cur rently using specification which is USB 2.0. The bus power spec has been
increased so that a unit load is 150mA (+50% over minimum using USB 2.0). An unconfigured
device can still draw only 1 unit load, but a configured device can draw up to 6 unit loads
(900mA, an 80% increase over USB 2.0 at a registered maxim um of 500mA). Minimum device
operating voltage is dropped from 4.4V to 4V. When operating in Super Speed mode, full-duplex
signaling occurs over 2 differential pairs separate from the non-SuperSpeed differ ential pair. This
result in USB 3.0 cables containing 2 wires for power and ground, 2 wires for non-Super Speeddata, and 4 wires for SuperSpeed data, and a shield (not required in previous specifications).
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HISTORY
PRE-RELEASES:
I. USB 0.7: Released in November 1994.
USB 0.8: Released in December 1994.
USB 0.9: Released in April 1995.
USB 0.99: Released in August 1995.
USB 1.0: Released in November 1995.
USB 1.0
USB 1.0: Released in January 1996.
Specified data rates of 1.5 Mbit/s (Low-Speed) and 12 Mbit/s (Full-Speed). Does not
allow for ex tension cables or pass-through monitors (due to timing and power limitations).
Few such devices actually made it to market.
USB 1.1: Released in September 1998.
Fixed problems identified in 1.0, mostly relating to hubs. Earliest revision to be widely
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adopted.
USB 2.0
1. USB 2.0: Released in April 2000.
Added higher maximum speed of 480 Mbit/s (now called Hi-Speed). Furthermodifications to the USB specification have been done via Engineering Change Notices
(ECN). The most important of these ECNs are included into the USB 2.0 specification
package available from USB.org:
I. Mini-B Connector ECN: Released in October 2000.
Specifications for Mini-B plug and receptacle. These should not be confused with
Micro-B plug and receptacle
II. Pull-up/Pull-down Resistors ECN: Released in May 2002.
III. Interface Associations ECN: Released in May 2003.
New standard descriptor was added that allows multiple interfaces to be
associated with a single device function.
IV. Rounded Chamfer ECN: Released in October 2003.
A recommended, compatible change to Mini-B plugs that results in longer lasting
connectors
V. Inter-Chip USB Supplement: Released in March 2006.
VI. On-The-Go Supplement 1.3: Released in December 2006.
USB On-The-Go makes it possible for two USB devices to communicate with
each other without re quiring a separate USB host. In practice, one of the USB
devices acts as a host for the other device.
VII. Battery Charging Specification 1.0: Released in March 2007.
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Adds support for dedicated chargers (power supplies with USB connectors), host
chargers (USB hosts that can act as chargers) and the No Dead Battery provision
which allows devices to temporarily draw 100 mA current after they have been
attached. If a USB device is connected to dedicated charger, maximum current
drawn by the device may be as high as 1.8A. (Note that this document is not distrib
uted with USB 2.0 specification package.)
VIII. Micro-USB Cables and Connectors Specification 1.01: Released in April 2007.
IX. Link PowerManagementAddendum ECN: Released in July 2007.
This adds a new power state between enabled and suspended states. Device in this
state is not required to reduce its power consumption. However, switching between
enabled and sleep states is much faster than switching between enabled and
suspended states, which allows devices to sleep while idle.
X. High-Speed Inter-Chip USB Electrical Specification Revision 1.0: Released in
September 2007.
USB 3.0
On September 18, 2007, Pat Gelsinger demonstrated USB 3.0 at the Intel
Developer Forum. The USB 3.0 Promoter Group announced on November 17, 2008, that
version 1.0 of the specification has been completed and is transitioned to the USB
Implementers Forum (USB-IF), the managing body of USB specifications. This move
effectively opens the spec to hardware developers for implementation in future products.
Features
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1. A new major feature is the "SuperSpeed" bus, which provides a fourth transfer mode at
4.8 Gbit/s. The raw throughput is 4 Gbit/s, and the specification considers it reasonable to
achieve 3.2 Gbit/s (0.4 GByte/s or 400 MByte/s) or more after protocol overhead.
2. When operating in SuperSpeed mode, full-duplex signaling occurs over 2 differential pairs
separate from the non-SuperSpeed differential pair. This results in USB 3.0 cables
containing 2 wires for power and ground, 2 wires for non-SuperSpeed data, and 4 wires for
SuperSpeed data, and a shield (not required in previous specifications).
3. To accommodate the additional pins for SuperSpeed mode, the physical form factors for
USB 3.0 plugs and receptacles have been modified from those used in previous versions.
Standard-A cables have extended heads where the SuperSpeed connectors extend beyond
and slightly above the legacy connectors. Similarly, the Standard-A receptacle is deeper to
accept these new connectors. On the other end, the SuperSpeed Standard-B connectors are
placed on top of the existing form factor. A legacy standard A-to-B cable will work as
designed and will never contact any of the SuperSpeed connectors, ensuring backward
compatibility. SuperSpeed standard A plugs will fit legacy A receptacles but SuperSpeed
standard B plugs will not fit into legacy standard B receptacles (so a new cable can be used
to connect a new device to an old host but not to connect a new host to an old device; for
that, a legacy standard A-to-B cable will be required)
4. SuperSpeed establishes a communications pipe between the host and each device, in a host-
directed protocol. In contrast, USB 2.0 broadcasts packet traffic to all devices.
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5. USB 3.0 extends the bulk transfer type in SuperSpeed with Streams. This extension allows
a host and device to create and transfer multiple streams of data through a single bulk pipe.
6. New power management features include support of idle, sleep and suspend states, as well
as Link-, Device-, and Function-level power management.
7. The bus power spec has been increased so that a unit load is 150 mA (+50% over minimum
using USB 2.0). An unconfigured device can still draw only 1 unit load, but a configured
device can draw up to 6 unit loads (900 mA, an 80% increase over USB 2.0 at a registered
maximum of 500 mA). Minimum device operating voltage is dropped from 4.4 V to 4 V.
8. USB 3.0 does not define cable assembly lengths, except that it can be of any length as long
as it meets all the requirements defined in the specification. However, electronicdesign.com
estimates cables will be limited to 3 m at SuperSpeed.
9. Technology is similar to a single channel (1x) of PCI Express 2.0 (5-Gbit/s). It uses
8B/10B encoding, linear feedback shift register (LFSR) scrambling for data and spread
spectrum. It forces receivers to use low frequency periodic signaling (LFPS), dynamic
equalization, and training sequences to ensure fast signal locking.
10.External Hard Drive supports USB 3.0 standard.
My Book 3.0 desktop external drive features SuperSpeed USB 3.0 compliant interface that
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provides transfer rates of up to 5 Gbps. Windows PC drive is also backwards compatible
with USB 2.0 and USB 1.1. Device supports resource-intensive video editing, animation,
and graphic design applications and is offered standalone or in kit with USB 3.0 PCIe
adapter card. One and two terabyte models are available.
OVERVIEW
A USB system has an asymmetric design, consisting of a host, a multitude of downstream USB
ports, and multiple peripheral devices connected in a tiered-star topology. Additional USB hubs
may be included in the tiers, allowing branching into a tree structure with up to five tier levels. A
USB host may have multiple host controllers and each host controller may provide one or more
USB ports. Up to 127 devices, including hub devices if present, may be connected to a single host
controller.[citation needed]
USB devices are linked in series through hubs. There always exists one hub known as the root hub,
which is built into the host controller. So-called sharing hubs, which allow multiple computers to
access the same peripheral device(s), also exist and work by switching access between PCs, either
automatically or manually. Sharing hubs are popular in small-office environments. In network
terms, they converge rather than diverge branches.
A physical USB device may consist of several logical sub-devices that are referred to as device
functions. A single device may provide several functions, for example, a webcam (video device
function) with a built-in microphone (audio device function). Such a device is called a compound
device in which each logical device is assigned a distinctive address by the host and all logical
devices are connected to a built-in hub to which the physical USB wire is connected. A host
assigns one and only one device address to a function.
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Fig 1.
USB endpoints actually reside on the connected device: the channels to the host are referred to as
pipes.
USB device communication is based on pipes (logical channels). A pipe is a connection from the
host controller to a logical entity, found on a device, and named an endpoint. The term endpoint is
occasionally incorrectly used for referring to the pipe. However, while an endpoint exists on the
device permanently, a pipe is only formed when the host makes a connection to the endpoint.
Therefore, when referring to a particular connection between a host and a USB device function, the
term pipe should be used. A USB device can have up to 32 endpoints: 16 into the host controller
and 16 out of the host controller. But, as one of the pipes is required to be of a bi-directional type
(the default control pipe), and thus uses 2 endpoints, the theoretical maximum number of pipes is
31. USB devices seldom have this many endpoints.
There are two types of pipes: stream and message pipes depending on the type of data transfer.
isochronous transfers: at some guaranteed data rate (often, but not necessarily, as fast as
possible) but with possible data loss (e.g. realtime audio or video).
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interrupt transfers: devices that need guaranteed quick responses (bounded latency) (e.g.
pointing devices and keyboards).
bulk transfers: large sporadic transfers using all remaining available bandwidth, but with no
guarantees on bandwidth or latency (e.g. file transfers).
control transfers: typically used for short, simple commands to the device, and a status
response, used, for example, by the bus control pipe number 0.
A stream pipe is a uni-directional pipe connected to a uni-directional endpoint that transfers data
using an isochronous, interrupt, or bulk transfer. A message pipe is a bi-directional pipe connected
to a bi-directional endpoint that is exclusively used for control data flow. An endpoint is built into
the USB device by the manufacturer and therefore exists permanently. An endpoint of a pipe is
addressable with tuple (device_address, endpoint_number) as specified in a TOKEN packet that
the host sends when it wants to start a data transfer session. If the direction of the data transfer is
from the host to the endpoint, an OUT packet (a specialization of a TOKEN packet) having the
desired device address and endpoint number is sent by the host. If the direction of the data transfer
is from the device to the host, the host sends an IN packet instead. If the destination endpoint is a
uni-directional endpoint whose manufacturer's designated direction does not match the TOKEN
packet (e.g., the manufacturer's designated direction is IN while the TOKEN packet is an OUT
packet), the TOKEN packet will be ignored. Otherwise, it will be accepted and the data transaction
can start. A bi-directional endpoint, on the other hand, accepts both IN and OUT packets.
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Fig 2.
Two USB receptacles on the front of a computer.
Endpoints are grouped into interfaces and each interface is associated with a single device
function. An exception to this is endpoint zero, which is used for device configuration and which is
not associated with any interface. A single device function composed of independently controlled
interfaces is called a composite device. A composite device only has a single device address
because the host only assigns a device address to a function.
When a USB device is first connected to a USB host, the USB device enumeration process is
started. The enumeration starts by sending a reset signal to the USB device. The data rate of the
USB device is determined during the reset signaling. After reset, the USB device's information is
read by the host and the device is assigned a unique 7-bit address. If the device is supported by the
host, the device drivers needed for communicating with the device are loaded and the device is set
to a configured state. If the USB host is restarted, the enumeration process is repeated for all
connected devices.
The host controller directs traffic flow to devices, so no USB device can transfer any data on the
bus without an explicit request from the host controller. In USB 2.0, the host controllerpolls the
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bus for traffic, usually in a round-robin fashion. The slowest device connected to a controller sets
the bandwidth of the interface. For SuperSpeed USB (defined since USB 3.0), connected devices
can request service from host. Because there are two separate controllers in each USB 3.0 host,
USB 3.0 devices will transmit and receive at USB 3.0 data rates regardless of USB 2.0 or earlier
devices connected to that host. Operating data rates for them will be set in the legacy manner.
1.1 DEVICE CLASSES
USB3 defines class codes used to identify a devices functionality and to load a device driver
based on that functionality. This enables every device driver writer to support devices from
different manufacturers that comply with a given class code.
Device classes include:
Class Usage Description Examples
00h Device Unspecified[8] (Device class is unspecified. Interface descriptors
are used for determining the required drivers.)
01h Interface Audio Speaker, microphone, sound card, MIDI
02h Both Communications
and CDC Control
Modem,Ethernet adapter, Wi-Fi adapter
03h Interface Human interface device
(HID)
Keyboard, mouse, joystick
05h Interface Physical Interface Device
(PID)
Force feedback joystick
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06h Interface Image Webcam, scanner
07h Interface Printer Laser printer, inkjet printer, CNC machine
08h Interface Mass storage USB flash drive, memory cardreader, digital
audio player, digital camera, external drive
09h Device USB hub Full bandwidth hub
0Ah Interface CDC-Data (This class is used together with class 02h
Communications and CDC Control.)
0Bh Interface Smart Card USB smart card reader
0Dh Interface Content security Fingerprint reader
0Eh Interface Video Webcam
0Fh Interface Personal Healthcare Pulse monitor (watch)
DCh Both Diagnostic Device USB compliance testing device
E0h Interface Wireless Controller Bluetooth adapter, Microsoft RNDIS
EFh Both Miscellaneous ActiveSync device
FEh Interface Application-specific IrDA Bridge, Test & Measurement Class
(USBTMC),[9] USB DFU (Direct Firmware
update)[10]
FFh Both Vendor-specific (This class code indicates that the device needs
vendor specific drivers.)
USB mass storage
Main article: USB mass storage device class
Fig 3.
A flash drive, a typical USB mass-storage device.
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USB implements connections to storage devices using a set of standards called the USB mass
storage device class (referred to as MSC or UMS). This was initially intended for traditional
magnetic and optical drives, but has been extended to support a wide variety of devices,
particularly flash drives. This generality is because many systems can be controlled with the
familiar metaphor of file manipulation within directories (the process of making a novel device
look like a familiar device is also known as extension). The ability to boot a write-locked SD card
with a USB adapter is particular advantageous for maintaining the integrity and non-corruptible,
pristine state of the booting medium. A live USB OS, resident on a write-locked SD card is
impervious to modification by computer viruses or ill-conditioned software
Though most newer computers are capable of booting off USB mass storage devices, USB is not
intended to be a primary bus for a computer's internal storage: buses such as Parallel ATA (PATA)
(or IDE), Serial ATA (SATA), orSCSI fulfill that role in PC class computers. However, USB has
one important advantage in that it is possible to install and remove devices without rebooting the
computer (hot-swapping), making it useful for mobile peripherals, including drives of various
kinds. Originally conceived and still used today for optical storage devices (CD-RW drives, DVD
drives, etc.), several manufacturers offer external portable USB hard drives, or empty enclosures
for disk drives, which offer performance comparable to internal drives, limited by the current
number and type of attached USB devices and by the upper limit of the USB interface (in practice
about 40 MB/s for USB 2.0 and potentially 400 MB/s or more for USB 3.0). These external drives
have typically included a "translating device" that bridges between a drive's interface (IDE, ATA,
SATA, PATA, ATAPI, or even SCSI) to a USB interface port. Functionally, the drive appears to
the user much like an internal drive. Other competing standards for external drive connectivity
include eSATA, ExpressCard (now at version 2.0), and FireWire (IEEE 1394).
Another use for USB mass storage devices is the portable execution of software applications (such
as web browsers and VoIP clients) without requiring installation on the host computer.
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1.1.1
1.1.2 Human interface devices (HIDs)
Main article: USB human interface device class
Mice and keyboards usually have USB connectors. These can be used with older computers that
have PS/2 connectors with the aid of a small USB-to-PS/2 adapter. Such adaptors contain no logic
circuitry: the hardware in the USB keyboard or mouse is devices are also progressively migrating
from MIDI, and PC game port connectors to USB. designed to detect whether it is connected to a
USB or PS/2 port, and communicate using the appropriate protocol.
Joysticks, keypads, tablets and other human-interface
CONNECTOR PROPERTIES
Availability
Consumer products are expected to become available in 2010. Commercial controllers are
expected to enter into volume production no later than the first quarter of 2010.On September 24,
2009Freecom announced a USB 3.0 external hard drive.
On October 27, 2009 Gigabyte Technology announced 7 new P55 chipsets motherboards
that included onboard USB 3.0, SATA Rev. 3 (6Gb/s) and triple power to all USB ports.On
January 6th, 2010 ASUS was the first manufacturer to release a USB 3.0-certified motherboard,
the P6X58D Premium.To ensure compatibility between motherboards and peripherals, all USB-certified devices must be approved by the USB Implementers Forum.
Drivers are under development forWindows 7, but support was not included with the
initial release of the operating system.[57]TheLinux kernel has supported USB 3.0 since version
2.6.31, which was released in September 2009.
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At least one complete end-to-end test system for USB3 designers is now on the market.
Intel will not support usb 3.0 until 2011
This will slow down mainstream adoption. These delays may be due to problems in the
CMOS manufacturing process, a focus to advance theNehalem platform or a tactic by Intel to
boost its upcomingLight Peakinterface. CurrentAMD roadmaps indicate that the new
southbridges released in the beginning of 2010 will not support USB 3.0. Market researcherIn-Stat
predicts a relevant market share of USB 3.0 not until 2011.
January 4, 2010, Seagate announced a small portable HDD with PC Card targeted for
laptops (or desktop with PC Card slot addition) at the CES in Las Vegas.
Fig 4.
USB 3.0 Hub demo board using the VIA VL810 chip
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Fig 5.
Physical Structure of Connectors
Usability
1. It is deliberately difficult to attach a USB connector incorrectly. Most connectors cannot be
plugged in upside down, and it is clear from the appearance and kinesthetic sensation of
making a connection when the plug and socket are correctly mated. However, it is not
obvious at a glance to the inexperienced user (or to a user without sight of the installation)
which way around the connector goes, thus it is often necessary to try both ways. More
often than not, however, the side of the connector with the trident logo should be on "top"
or "toward" the user. Most manufacturers do not, however, make the trident easily visible
or detectable by touch.
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2. Only moderate insertion / removal force is needed (by specification). USB cables and small
USB devices are held in place by the gripping force from the receptacle (without need of
the screws, clips, or thumbturns other connectors have required).
3. The force needed to make or break a connection is modest, allowing connections to be
made in awkward circumstances (ie, behind a floor mounted chassis, or from below) or by
those with motor disabilities. This has the disadvantage of easily and unintentionally
breaking connections that one has intended to be permanent in case of cable accident (e.g.,
tripping, or inadvertent tugging).
4. The standard connectors were deliberately intended to enforce the directed topology of a
USB network: type A connectors on host devices that supply power and type B connectors
on target devices that receive power. This prevents users from accidentally connecting two
USB power supplies to each other, which could lead to dangerously high currents, circuit
failures, or even fire.
Durability
1. The standard connectors were designed to be robust. Many previous connector designs
were fragile, specifying embedded component pins or other delicate parts which proved
liable to bending or breaks, even with the application of only very modest force. The
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electrical contacts in a USB connector are protected by an adjacent plastic tongue, and the
entire connecting assembly is usually further protected by an enclosing metal sheath. As a
result USB connectors can safely be handled, inserted, and removed, even by a young
child.
2. The connector construction always ensures that the external sheath on the plug makes
contact with its counterpart in the receptacle before any of the four connectors within make
electrical contact. The external metallic sheath is typically connected to system ground,
thus dissipating any potentially damaging static charges (rather than via delicate electronic
components). This enclosure design also means that there is a (moderate) degree of
protection from electromagnetic interference afforded to the USB signal while it travels
through the mated connector pair (this is the only location when the otherwise twisted data
pair must travel a distance in parallel). In addition, because of the required sizes of the
power and common connections, they are made after the system ground but before the data
connections.
3. The newerMicro-USB receptacles are designed to allow up to 10,000 cycles of insertion
and removal between the receptacle and plug, compared to 1500 for the standard USB and
5000 for the Mini-USB receptacle. This is accomplished by adding a locking device and by
moving the leaf-spring connector from the jack to the plug, so that the most-stressed part is
on the cable side of the connection.
Compatibility
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1. The USB standard specifies relatively loose tolerances for compliant USB connectors,
intending to minimize incompatibilities in connectors produced by different vendors (a
goal that has been very successfully achieved). Unlike most other connector standards, the
USB specification also defines limits to the size of a connecting device in the area around
its plug. This was done to prevent a device from blocking adjacent ports due to the size of
the cable strain relief mechanism (usually molding integral with the cable outer insulation)
at the connector. Compliant devices must either fit within the size restrictions or support a
compliant extension cable which does.
2. Two-way communication is also possible. In USB 3.0, full-duplex communications are
done when using SuperSpeed (USB 3.0) transfer. In previous USB versions (ie, 1.x or 2.0),
all communication is half-duplex and directionally controlled by the host.
3. USB 3.0 receptacles are electrically compatible with USB 2.0 device plugs if they can
physically match. Most combinations will work, but there are a few physical
incompatibilities. However, only USB 3.0 Standard-A receptacles can accept USB 3.0
Standard-A device plugs.
4. In general, cables have only plugs (very few have a receptacle on one end), and hosts and
devices have only receptacles. Hosts almost universally have type-A receptacles, and
devices one or another type-B variety. Type-A plugs mate only with type-A receptacles,
and type-B with type-B; they are deliberately physically incompatible.
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CONNECTOR TYPES
Pinouts of Standard, Mini, and Micro USB connectors
Fig 6.
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Fig 7.
Different types of USB connectors from left to right:
male micro USB
male mini USB B-type
male B-type
female A-type
male A-type
There are several types of USB connectors, including some that have been added while the
specification progressed. The original USB specification detailed Standard-A and Standard-B
plugs and receptacles. The first engineering change notice to the USB 2.0 specification added
Mini-B plugs and receptacles.
The data connectors in the A - Plug are actually recessed in the plug as compared to the
outside power connectors. This permits the power to connect first which prevents data errors by
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allowing the device to power up first and then transfer the data. Some devices will operate in
different modes depending on whether the data connection is made. This difference in connection
can be exploited by inserting the connector only partially. For example, some battery-powered
MP3 players switch into file transfer mode (and cannot play MP3 files) while a USB plug is fully
inserted, but can be operated in MP3 playback mode using USB power by inserting the plug only
part way so that the power slots make contact while the data slots do not. This enables those
devices to be operated in MP3 playback mode while getting power from the cable.
USB-A
The Standard-A type of USB plug is a flattened rectangle which inserts into a
"downstream-port" receptacle on the USB host, or a hub, and carries both power and data. This
plug is frequently seen on cables that are permanently attached to a device, such as one connecting
a keyboard or mouse to the computer via usb connection.
USB-B
A Standard-B plug which has a square shape with bevelled exterior corners typically plugs
into an "upstream receptacle" on a device that uses a removable cable, e.g. a printer. A Type B
plug delivers power in addition to carrying data. On some devices, the Type B receptacle has no
data connections, being used solely for accepting power from the upstream device. This two-
connector-type scheme (A/B) prevents a user from accidentally creating an electrical loop.
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Fig 8.
Pin configuration of the USB connectors Standard A/B, viewed from face of plug
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COMPARISONS WITH OTHER DEVICE CONNECTIONTECHNOLOGIES
1. FireWire
USB was originally seen as a complement to FireWire (IEEE 1394), which was designed
as a high-bandwidth serial bus which could efficiently interconnect peripherals such as hard disks,
audio interfaces, and video equipment. USB originally operated at a far lower data rate and used
much simpler hardware, and was suitable for small peripherals such as keyboards and mice.
The most significant technical differences between FireWire and USB include the following:
I. USB networks use a tiered-startopology, while FireWire networks use a tree topology.
II. USB 1.0, 1.1 and 2.0 use a "speak-when-spoken-to" protocol. Peripherals cannotcommunicate with the host unless the host specifically requests communication. USB 3.0 is
planned to allow for device-initiated communications towards the host (see USB 3.0
below). A FireWire device can communicate with any other node at any time, subject to
network conditions.
III. A USB network relies on a single host at the top of the tree to control the network. In aFireWire network, any capable node can control the network.
IV. USB runs with a 5 V power line, while Firewire (theoretically) can supply up to 30 V.
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V. Standard USB hub ports can provide from the typical 500mA[2.5 Watts] of current, only
100mA from non-hub ports.
VI. USB 3.0 & USB On-The-Go 1800mA[9.0W] (for dedicated battery charging,
1500mA[7.5W] Full bandwidth or 900mA[4.5W] High Bandwidth), while FireWire can in
theory supply up to 60 watts of power, although 10 to 20 watts is more typical.
These and other differences reflect the differing design goals of the two buses: USB was
designed for simplicity and low cost, while FireWire was designed for high performance,
particularly in time-sensitive applications such as audio and video. Although similar in theoretical
maximum transfer rate, FireWire 400 has performance advantage over USB 2.0 Hi-Bandwidth in
real-use, especially in high-bandwidth use such as external hard-drives.
The newer FireWire 800 standard being twice as fast as FireWire 400 outperforms USB 2.0
Hi-Bandwidth both theoretically and practically.The chipset and drivers used to implement USB
and Firewire have a crucial impact on how much of the bandwidth prescribed by the specification
is achieved in the real world, along with compatibility with peripherals.
2. Power over Ethernet
The 802.3afPower over Ethernet has superior power negotiation and optimization capabilities to
powered USB. Power over Ethernet also supplies more power because it operates at 48V, 720mA
while USB operates at 5V, 500mA. Ethernet also operates many more meters, with significant DC
power loss, and will remain accordingly the preferred option forVoIP,security camera and other
applications where networks extend through a building. However, USB is preferred when cost is
critical.
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3. Digital musical instruments
Digital musical instruments are another example of where USB is competitive for low-cost
devices. However power over ethernet and the MIDI plug standard are preferred in high-end
devices that must work with long cables. USB can cause ground loop problems in audio equipment
because it connects the ground signals on both transceivers. By contrast, the MIDI plug standard
and ethernet have built-in isolation to 500V or more.
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CABLES
The maximum length of a standard USB cable (for USB 2.0 or earlier) is 5.0 metres
(16.4 ft). The primary reason for this limit is the maximum allowed round-trip delay of about
1,500 ns. If USB host commands are unanswered by the USB device within the allowed time, the
host considers the command lost. When adding USB device response time, delays from the
maximum number of hubs added to the delays from connecting cables, the maximum acceptable
delay per cable amounts to be 26 ns.
The USB 2.0 specification requires cable delay to be less than 5.2 ns per meter
(192,000 km/s, which is close to the maximum achievable bandwidth for standard copper cable).
This allows for a 5 meter cable. The USB 3.0 standard does not directly specify a maximum cable
length, requiring only that all cables meet an electrical specification. For copper wire cabling, some
calculations have suggested a maximum length of perhaps 3m.
No fiber optic cable designs are known to be under development, but they would be likely
to have a much longer maximum allowable length, and more complex construction.
The data cables for USB 1.x and USB 2.x use a twisted pairto reducenoise and crosstalk.
They are arranged much as in the diagram below. USB 3.0 cables are more complex and employ
shielding for some of the added data lines (2 pairs); a shield is added around the pair sketched.
Fig 9.
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USB 1.x/2.0 cable wiring
USB 1.x/2.0 Miniplug/Microplug
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Pin Name Cable color Description
1 VCC Red +5 V
2 D White Data
3 D+ Green Data +
4 GND Black Ground
Pin Name Color Description
1 VCC Red +5 V
2 D White Data 3 D+ Green Data +
4 ID none permits distinction of
Micro-A- and Micro-B-Plug
Type A: connected to Ground
Type B: not connected
5 GND Black Signal Ground
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MAXIMUM USEFUL DISTANCE
USB 1.1 maximum cable length is 3 metres (9.8 ft) and USB 2.0 maximum cable length is
5 metres (16 ft). Maximum permitted hubs connected in series is 5. Although a single cable is
limited to 5 metres, the USB 2.0 specification permits up to five USB hubs in a long chain of
cables and hubs. This allows for a maximum distance of 30 metres (98 ft) between host and
device, using six cables 5 metres (16 ft) long and five hubs. In actual use, since some USB devices
have built-in cables for connecting to the hub, the maximum achievable distance is 25 metres
(82 ft) + the length of the device's cable. For longer lengths, USB extenders that use CAT5 cable
can increase the distance between USB devices up to 50 metres (160 ft).
A method of extending USB beyond 5 metres (16 ft) is by using low resistance cable.The
higher cost of USB 2.0 Cat 5 extenders has urged some manufacturers to use other methods to
extend USB, such as using built-in USB hubs, and custom low-resistance USB cable. It is
important to note that devices which use more bus power, such as USB hard drives and USB
scanners will require the use of a powered USB hub at the end of the extension, so that a constant
connection will be achieved. If power and data does not have sufficient power then problems can
result, such as no connection at all, or intermittent connections during use.
USB 3.0 cable assembly may be of any length as long as all requirements defined in the
specification are met. However, maximum bandwidth can be achieved across a maximum cable
length of approximately 3 metres.
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Fig 13Architecture of USB 3.0
APPLICATIONS
The USB ports are used for a number of applications. The USB ports get the popularity
because of its simplicity as well the easiness in use. The main application of USB 3.0 is listedbelow.
1. USB implements connections to storage devices using a set of standards called the USB
mass storage device class (referred to as MSC or UMS). This was initially intended for
traditional magnetic and optical drives, but has been extended to support a wide variety of
devices, particularly flash drives. This generality is because many systems can becontrolled with the familiar idiom of file manipulation within directories (The process of
making a novel device look like a familiar device is also known as extension)
2. USB 3.0 can also support portable hard disk drives. The earlier versions of USBs
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were not supporting the 3.5 inch hard disk drives. Originally conceived and still used
today for optical storage devices (CD-RW drives, DVD drives, etc.), a number of
manufacturers offer external portable USB hard drives, or empty enclosures for drives,
that offer performance comparable to internal drives.
3. These external drives usually contain a translating device that interfaces a drive of
conventional technology (IDE, ATA, SATA, ATAPI, or even SCSI) to a USB port.
Functionally, the drive appears to the user just like an internal drive.
4. These are used to provide power for low power consuming devises. These can
be used for charging the mobile phones.
5. Though most newer computers are capable of booting off USB Mass Storage devices, USB
is not intended to be a primary bus for a computer's internal storage: buses such as ATA
(IDE), Serial ATA (SATA), and SCSI fulfill that role. However, USB has one important
advantage in that it is possible to install and remove devices without opening the computer
case, making it useful for external drives.
6. Mice and keyboards are frequently fitted with USB connectors, but because most
PC motherboards still retain PS/2 connectors for the keyboard and mouse as of 2007, they
are often supplied with a small USB-to-PS/2 adaptor, allowing usage with either USB or
PS/2 interface.
7. Joysticks, keypads, tablets and other human-interface devices are also
progressively migrating from MIDI, PC game port, and PS/2 connectors to USB.
8. It can also support Ethernet adapter, modem, serial port adapter etc
9. It can support Full speed hub, hi-speed hub, and SuperSpeed hub.
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10. It can support USB smart card reader, USB compliance testing devices, Wi-Fi adapter,
Bluetooth adapter, ActiveSync device, Force feedback joystick
ADVANTAGES
1. 10x throughput increase vsUSB2.0 (480Mbps -> 5Gbps)cable length reduced to 3M MAX.
2. Backwards compatibleUSB 2.0 devices will continue to work, and new devices work with
old systems
Same USB device model and pipe model
Host class drivers should work immediately with Super Speed
3. Power efficientespecially on host, but devices can also benefit
4. Future improvementsExisting design can support 25Gbps link speeds
5. Proven basis
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http://en.wikipedia.org/wiki/Open_Mobile_Terminal_Platformhttp://en.wikipedia.org/wiki/Samsunghttp://en.wikipedia.org/wiki/Motorolahttp://en.wikipedia.org/wiki/Sony_Ericssonhttp://en.wikipedia.org/wiki/LGhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/GSM_Associationhttp://en.wikipedia.org/wiki/OMTPhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/OMTPhttp://en.wikipedia.org/wiki/International_Telecommunication_Unionhttp://en.wikipedia.org/wiki/File:USBVacuumCleaner.jpghttp://en.wikipedia.org/wiki/Chinahttp://en.wikipedia.org/wiki/Universal_Serial_Bus#cite_note-39http://en.wikipedia.org/wiki/Open_Mobile_Terminal_Platformhttp://en.wikipedia.org/wiki/Nokiahttp://en.wikipedia.org/wiki/Samsunghttp://en.wikipedia.org/wiki/Motorolahttp://en.wikipedia.org/wiki/Sony_Ericssonhttp://en.wikipedia.org/wiki/LGhttp://en.wikipedia.org/wiki/GSM_Associationhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/OMTPhttp://en.wikipedia.org/wiki/CTIA_%E2%80%93_The_Wireless_Associationhttp://en.wikipedia.org/wiki/European_Commissionhttp://en.wikipedia.org/wiki/European_Unionhttp://en.wikipedia.org/wiki/International_Telecommunication_Union8/2/2019 Usb3.0 Report Cover Pages
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JIET, Jodhpur
Signaling based on PCIe and SATA
6. More power f or super-speed devicesUp to 900mA (USB 2.0 maximum 500mA)
DISADVANTAGES
1. Speed issuesThere have been many reports of USB 3.0 equipment only transferring dataat USB 2.0 speed, usuallywith amessage "This USB Mass Storage Devicecan transfer information faster if youconnect it to a Super-Speed USB 3.0port". This has been due to severalcauses, including drivers,certain cables specified as USB 3.0 (problemsdisappeared when a differentcable was used), orderof starting equipment, equipment needing to be disconnectedandreconnected, and overclocked computers.
2. Intel at present not supporting USB 3.0.
3. Cable lenght is limited to 3 mts.
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http://en.wikipedia.org/wiki/Wall_warthttp://en.wikipedia.org/wiki/Optical_disc_drivehttp://en.wikipedia.org/wiki/Wall_warthttp://en.wikipedia.org/wiki/Wall_warthttp://en.wikipedia.org/wiki/Inrush_currenthttp://en.wikipedia.org/wiki/Inrush_currenthttp://en.wikipedia.org/wiki/File:USBVacuumCleaner.jpghttp://en.wikipedia.org/wiki/Vacuum_cleanerhttp://en.wikipedia.org/wiki/Optical_disc_drivehttp://en.wikipedia.org/wiki/Electrical_motorhttp://en.wikipedia.org/wiki/Electrical_lamphttp://en.wikipedia.org/wiki/Wall_warthttp://en.wikipedia.org/wiki/USB_decorationhttp://en.wikipedia.org/wiki/Vacuum_cleanerhttp://en.wikipedia.org/wiki/Lava_lamphttp://en.wikipedia.org/wiki/Inrush_currenthttp://en.wikipedia.org/wiki/Filter_capacitor8/2/2019 Usb3.0 Report Cover Pages
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JIET, Jodhpur
FUTURE TRENDS
USB 3.0 is the next major revision of the ubiquitous Universal Serial Bus, created in 1996
by a consortium of companies led by Intel to dramatically simplify the connection between host
computer and peripheral devices. Fast forwarding to 2009, USB 2.0 has been firmly entrenched asthe de-facto interface standard in the PC world for years (with about 6 billion devices sold), and
yet still the need for more speed by ever faster computing hardware and ever greater bandwidth
demands again drive us to where a couple of hundred megabits per second is just not fast enough.
The Universal serial bus 3.0 is supporting a speed of about 5 Gb/sec ie ten times faster than the 2.0
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http://en.wikipedia.org/wiki/Broadcomhttp://www.everythingusb.com/superspeed-usb.htmlhttp://en.wikipedia.org/wiki/Platform_Controller_Hubhttp://en.wikipedia.org/wiki/Southbridge_(computing)http://en.wikipedia.org/wiki/Advanced_Micro_Deviceshttp://en.wikipedia.org/wiki/AMD_700_chipset_series#SP5100http://en.wikipedia.org/wiki/Broadcomhttp://en.wikipedia.org/wiki/Intel_Corporationhttp://en.wikipedia.org/wiki/Platform_Controller_Hubhttp://en.wikipedia.org/wiki/Nvidiahttp://en.wikipedia.org/wiki/Nvidia_Ionhttp://www.everythingusb.com/superspeed-usb.html8/2/2019 Usb3.0 Report Cover Pages
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JIET, Jodhpur
version. And it is also faster than the new Firewire product S3200. So hopefully by the help of this
SuperSpeed data transfer rate the USB 3.0 will be replacing many of the connecters in the future.
The prototype of the USB 3.0 was already implemented by ASUSE in their motherboard. The
drivers for the USB 3.0 are made available to the opensource Linux. The Linux kernel will support
USB 3.0 with version 2.6.31, which will be released around August. Because of the backward
compatibility of the USB 3.0 the devises which we are using now and the ports we are using
now(which is USB 2.0) will be working proper with the new USB 3.0 devises and ports. Consumer
products are expected to become available in 2010. Commercial controllers are expected to enter
into volume production no later than the first quarter of 2010.
In a nutshell, USB 3.0 promises the following:
Higher transfer rates (up to 4.8Gbps)
Increased maximum bus power and increased device current draw to better accommodate
power-hungry devices
New power management features
Full-duplex data transfers and support for new transfer types
New connectors and cables for higher speed data transfer...although they are backwards
compatible with USB 2.0 devices and computer
REFERENCES
1. USB 3.0 specifications released by USB consortium
2. http://www.reghardware.co.uk/superspeed_usb_3_guide
3. http://en.wikipedia.org/wiki/Universal_Serial_bus
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http://en.wikipedia.org/wiki/Acer_Laboratories_Incorporatedhttp://en.wikipedia.org/wiki/VIA_Technologieshttp://en.wikipedia.org/wiki/Acer_Laboratories_Incorporatedhttp://en.wikipedia.org/wiki/VIA_Technologieshttp://en.wikipedia.org/wiki/Packet_(information_technology)http://en.wikipedia.org/wiki/Endiannesshttp://www.reghardware.co.uk/superspeed_usb_3_guidehttp://en.wikipedia.org/wiki/Universal_Serial_bushttp://en.wikipedia.org/wiki/Silicon_Integrated_Systemshttp://en.wikipedia.org/wiki/Acer_Laboratories_Incorporatedhttp://en.wikipedia.org/wiki/VIA_Technologieshttp://en.wikipedia.org/wiki/Packet_(information_technology)http://en.wikipedia.org/wiki/Endiannesshttp://www.reghardware.co.uk/superspeed_usb_3_guidehttp://en.wikipedia.org/wiki/Universal_Serial_bus8/2/2019 Usb3.0 Report Cover Pages
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JIET, Jodhpur
4. http://www.usb.org/developers/ssusb
5. http://www.usb.org/developers/docs
6. http://www.wired.com/gadgetlab/2008/11/superspeed-us-1
7. http://tech.blorge.com
8. http://www.interfacebus.com
9. http://www.everythingusb.com/superspeed-usb.html
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Dept. of Electronics & Comm. Engineering
JIET, Jodhpur