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USB 3.0 is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices. Among other improvements, USB 3.0 adds the new transfer rate referred to as SuperSpeed USB
USB
(SS) that can transfer data at up to 5  Gbit/s (625 MB/s), which is about 10 times as fast as the USB 2.0 standard. Manufacturers are recommended to distinguish USB 3.0 connectors from their USB 2.0 counterparts by blue color-coding of the Standard-A receptacles and plugs,[2] and by the initials SS.[3] USB 3.1, released in July 2013, is the successor standard that replaces the USB 3.0 standard. USB 3.1 preserves the existing SuperSpeed transfer rate, giving it the new label USB
USB
3.1 Gen 1,[4][5] while defining a new SuperSpeed+ transfer mode, called USB 3.1 Gen 2[4] which can transfer data at up to 10 Gbit/s (1250 MB/s, twice the rate of USB 3.0).[6][7] USB 3.2, released in September 2017, replaces the USB 3.1 standard. It preserves existing USB
USB
3.1 SuperSpeed and SuperSpeed+ data modes and introduces two new SuperSpeed+ transfer modes over the USB-C
USB-C
connector using two-lane operation, with data rates of 10 and 20 Gbit/s (1250 and 2500 MB/s).

Contents

1 Overview

1.1 Architecture and features 1.2 Data transfer and synchronization 1.3 Data encoding 1.4 Power and charging

2 Availability

2.1 Adding to existing equipment 2.2 Adoption

3 Issues

3.1 Speed and compatibility 3.2 Radio frequency interference

4 Connectors

4.1 Pinouts 4.2 Backward compatibility

5 USB
USB
3.1 6 USB
USB
3.2 7 See also 8 References 9 External links

Overview[edit] The USB 3.0 specification is similar to USB 2.0, but with many improvements and an alternative implementation. Earlier USB concepts such as endpoints and the four transfer types (bulk, control, isochronous and interrupt) are preserved but the protocol and electrical interface are different. The specification defines a physically separate channel to carry USB 3.0 traffic. The changes in this specification make improvements in the following areas:

Transfer speed – USB 3.0 adds a new transfer type called SuperSpeed or SS, 5  Gbit/s (electrically, it is more similar to PCI Express 2.0
PCI Express 2.0
and SATA than USB 2.0)[8] Increased bandwidth – USB 3.0 uses two unidirectional data paths instead of only one: one to receive data and the other to transmit Power management – U0 to U3 link power management states are defined Improved bus use – a new feature is added (using packets NRDY and ERDY) to let a device asynchronously notify the host of its readiness, with no need for polling Support for rotating media – the bulk protocol is updated with a new feature called Stream Protocol that allows a large number of logical streams within an Endpoint

USB 3.0 has transmission speeds of up to 5 Gbit/s, about ten times faster than USB 2.0 (480 Mbit/s) even without considering that USB 3.0 is full duplex whereas USB 2.0 is half duplex. This gives USB 3.0 a potential total bidirectional bandwidth twenty times greater than USB
USB
2.0.[9] Architecture and features[edit]

Front view of a Standard-A USB 3.0 connector, showing its front row of four pins for the USB 1.x/2.0 backward compatibility, and a second row of five pins for the new USB 3.0 connectivity. The plastic insert is in the USB
USB
3.0 standard blue color known as Pantone 300C.

In USB 3.0, dual-bus architecture is used to allow both USB 2.0 (Full Speed, Low Speed, or High Speed) and USB 3.0 (SuperSpeed) operations to take place simultaneously, thus providing backward compatibility. Connections also permit forward compatibility, that is, running USB 3.0 devices on USB 2.0 ports. The structural topology is the same, consisting of a tiered star topology with a root hub at level 0 and hubs at lower levels to provide bus connectivity to devices. Data transfer and synchronization[edit] The SuperSpeed transaction is initiated by a host request, followed by a response from the device. The device either accepts the request or rejects it; if accepted, the device sends data or accepts data from the host. If the endpoint is halted, the device responds with a STALL handshake. If there is lack of buffer space or data, it responds with a Not Ready (NRDY) signal to tell the host that it is not able to process the request. When the device is ready, sends an Endpoint Ready (ERDY) to the host which then reschedules the transaction. The use of unicast and the limited amount of multicast packets, combined with asynchronous notifications, enables links that are not actively passing packets to be put into reduced power states, which allows better power management. Data encoding[edit] The "SuperSpeed" bus provides for a transfer mode at a nominal rate of 5.0 Gbit/s, in addition to the three existing transfer modes. Accounting for the encoding overhead, the raw data throughput is 4 Gbit/s, and the specification considers it reasonable to achieve 3.2  Gbit/s (400 MB/s) or more in practice.[10] All data is sent as a stream of eight-bit (one-byte) segments that are scrambled and converted into 10-bit symbols via 8b/10b encoding; this helps the receiver to decode correctly even in the presence of electromagnetic interference (EMI). Scrambling is implemented using a free-running linear feedback shift register (LFSR). The LFSR
LFSR
is reset whenever a COM symbol is sent or received.[10] Unlike previous standards, the USB 3.0 standard does not specify a maximum cable length, requiring only that all cables meet an electrical specification: for copper cabling with AWG 26 wires, the maximum practical length is 1.3 meters (4.3 ft).[11] Power and charging[edit] As with earlier versions of USB, USB
USB
3.0 provides power at 5 volts nominal. The available current for low-power (one unit load) SuperSpeed devices is 150 mA, an increase from the 100 mA defined in USB
USB
2.0. For high-power SuperSpeed devices, the limit is six unit loads or 900 mA (4.5 W), almost twice USB
USB
2.0's 500 mA.[10]:section 9.2.5.1 Power Budgeting The term "available current" can be misunderstood. It implies that if a low power device or a USB2 device is connected to a USB3 port it can only draw 150 mA or 500 mA from that port. However, the available current for any USB
USB
device plugged into a USB3 port is 900 mA (unless it is charging port compliant) as defined by the USB3 spec. The actual current draw is determined by the device capability. The Vbus, pin 1, and Ground, pin 4, are the same for USB 1, 2, or 3. A USB2 HDD with 2 USB2 connectors needing a total of 800 mA will draw full power from a single USB3 port. A USB2 phone will probably charge faster since 900 mA is "available" to it. USB
USB
3.0 ports may implement other USB
USB
specifications for increased power, including the USB
USB
Battery Charging Specification for up to 1.5 A or 7.5 W, or, in the case of USB
USB
3.1, the USB
USB
Power Delivery specification for charging the host device up to 100 W.[12] Availability[edit]

A USB 3.0 four-port hub, using a VIA Technologies
VIA Technologies
chipset

The USB
USB
3.0 Promoter Group announced on 17 November 2008 that the specification of version 3.0 had been completed and had made the transition to the USB
USB
Implementers Forum (USB-IF), the managing body of USB
USB
specifications.[13] This move effectively opened the specification to hardware developers for implementation in future products. The first USB
USB
3.0 consumer products were announced and shipped by Buffalo Technology
Buffalo Technology
in November 2009, while the first certified USB 3.0 consumer products were announced on 5 January 2010, at the Las Vegas Consumer Electronics Show
Consumer Electronics Show
(CES), including two motherboards by ASUS
ASUS
and Gigabyte Technology.[14][15] Manufacturers of USB
USB
3.0 host controllers include, but are not limited to, Renesas Electronics, Fresco Logic, ASMedia Technology, Etron, VIA Technologies, Texas Instruments, NEC
NEC
and Nvidia. As of November 2010, Renesas and Fresco Logic[16] have passed USB-IF certification. Motherboards for Intel's Sandy Bridge
Sandy Bridge
processors have been seen with Asmedia and Etron host controllers as well. On 28 October 2010, Hewlett-Packard
Hewlett-Packard
released the HP Envy 17 3D featuring a Renesas USB 3.0 host controller several months before some of their competitors. AMD
AMD
worked with Renesas to add its USB 3.0 implementation into its chipsets for its 2011 platforms.[needs update] At CES2011, Toshiba
Toshiba
unveiled a laptop called " Toshiba
Toshiba
Qosmio X500" that included USB
USB
3.0 and Bluetooth
Bluetooth
3.0, and Sony
Sony
released a new series of Sony
Sony
VAIO laptops that would include USB 3.0. As of April 2011, the Inspiron
Inspiron
and Dell XPS
Dell XPS
series were available with USB 3.0 ports, and, as of May 2012, the Dell Latitude
Dell Latitude
laptop series were as well; yet the USB
USB
root hosts failed to work at SuperSpeed under Windows 8. On 11 June 2012, Apple announced new MacBook Airs and MacBook Pro
MacBook Pro
with USB
USB
3.0. Adding to existing equipment[edit]

A USB 3.0 controller in form of a PCI Express
PCI Express
expansion card

Side connectors on a laptop computer. Left to right: USB 3.0 host, VGA connector, DisplayPort
DisplayPort
connector, USB 2.0 host. Note the additional pins on the top side of the USB 3.0 port.

In laptop computers that lack USB 3.0 ports but have an ExpressCard
ExpressCard
slot, USB 3.0 ports can be added by using an ExpressCard-to-USB 3.0 adapter. Although the ExpressCard
ExpressCard
port itself is powered from a 3.3 V line, the connector also has a USB 2.0 port available to it (some express cards actually use the USB 2.0 interface rather than the true express card port). However, this USB 2.0 port is only capable of supplying the power for one USB 3.0 port. Where multiple ports are provided on the express card, additional power will need to be provided.[17] Additional power for multiple ports on a laptop PC may be derived in the following ways:

Some ExpressCard-to-USB 3.0 adapters may connect by a cable to an additional USB 2.0 port on the computer, which supplies additional power. The ExpressCard
ExpressCard
may have a socket for an external power supply. If the external device has an appropriate connector, it can be powered by an external power supply. USB 3.0 port provided by an ExpressCard-to-USB 3.0 adapter may be connected to a separately-powered USB 3.0 hub, with external devices connected to that USB 3.0 hub.

On the motherboards of desktop PCs which have PCI Express
PCI Express
(PCIe) slots (or the older PCI standard), USB 3.0 support can be added as a PCI Express
PCI Express
expansion card. In addition to an empty PCIe slot on the motherboard, many " PCI Express
PCI Express
to USB 3.0" expansion cards must be connected to a power supply such as a Molex adapter or external power supply, in order to power many USB 3.0 devices such as mobile phones, or external hard drives that have no power source other than USB; as of 2011, this is often used to supply two to four USB 3.0 ports with the full 0.9 A (4.5 W) of power that each USB 3.0 port is capable of (while also transmitting data), whereas the PCI Express
PCI Express
slot itself cannot supply the required amount of power. If faster connections to storage devices are the reason to consider USB 3.0, an alternative is to use eSATAp, possibly by adding an inexpensive expansion slot bracket that provides an eSATAp port; some external hard disk drives provide both USB
USB
(2.0 or 3.0) and eSATAp interfaces.[15] To ensure compatibility between motherboards and peripherals, all USB-certified devices must be approved by the USB Implementers Forum (USB-IF). At least one complete end-to-end test system for USB 3.0 designers is available on the market.[18] Adoption[edit] The USB
USB
Promoter Group announced the release of USB
USB
3.0 on November 2008. On 5 January 2010, USB-IF announced the first two certified USB 3.0 motherboards, one by Asus and one by Gigabyte.[15][19] Previous announcements included Gigabyte's October 2009 list of seven P55 chipset USB
USB
3.0 motherboards,[20] and an ASUS
ASUS
motherboard that was cancelled before production.[21] Commercial controllers were expected to enter into volume production in the first quarter of 2010.[22] On 14 September 2009, Freecom announced a USB
USB
3.0 external hard drive.[23] On 4 January 2010, Seagate announced a small portable HDD bundled with an additional USB 3.0 ExpressCard, targeted for laptops (or desktops with ExpressCard
ExpressCard
slot addition) at the CES in Las Vegas Nevada.[24][25] The Linux kernel mainline
Linux kernel mainline
contains support for USB 3.0 since version 2.6.31, which was released in September 2009.[26][27][28] FreeBSD
FreeBSD
supports USB 3.0 since version 8.2, which was released in February 2011.[29] Windows 8
Windows 8
was the first Microsoft
Microsoft
operating system to offer built in support for USB
USB
3.0.[30] In Windows 7
Windows 7
support was not included with the initial release of the operating system.[31] However, drivers that enable support for Windows 7
Windows 7
are available through websites of hardware manufacturers. Intel
Intel
released its first chipset with integrated USB
USB
3.0 ports in 2012 with the release of the Panther Point chipset. Some industry analysts have claimed that Intel
Intel
was slow to integrate USB
USB
3.0 into the chipset, thus slowing mainstream adoption.[32] These delays may be due to problems in the CMOS
CMOS
manufacturing process,[33] a focus to advance the Nehalem platform,[34] a wait to mature all the 3.0 connections standards ( USB
USB
3.0, PCIe 3.0, SATA 3.0) before developing a new chipset,[35][36] or a tactic by Intel
Intel
to favor its new Thunderbolt interface.[37] Apple, Inc. announced laptops with USB
USB
3.0 ports on 11 June 2012, nearly four years after USB
USB
3.0 was finalized. AMD
AMD
began supporting USB
USB
3.0 with its Fusion Controller Hubs in 2011. Samsung Electronics
Samsung Electronics
announced support of USB
USB
3.0 with its ARM-based Exynos
Exynos
5 Dual platform intended for handheld devices. Issues[edit] Speed and compatibility[edit] Various early USB 3.0 implementations widely used the NEC/Renesas µD72020x family of host controllers,[38] which are known to require a firmware update to function properly with some devices.[39][40][41] A factor affecting the speed of USB
USB
storage devices (more evident with USB 3.0 devices, but also noticeable with USB 2.0 ones) is that the USB
USB
Mass Storage Bulk-Only Transfer (BOT) protocol drivers are generally slower than the USB
USB
Attached SCSI
SCSI
protocol (UAS[P]) drivers.[42][43][44][45] On some old (2009–2010) Ibex Peak-based motherboards, the built-in USB 3.0 chipsets are connected by default via a 2.5 GT/s PCI Express lane of the PCH, which then did not provide full PCI Express 2.0 speed (5 GT/s), so it did not provide enough bandwidth even for a single USB 3.0 port. Early versions of such boards (e.g. the Gigabyte Technology
Gigabyte Technology
P55A-UD4 or P55A-UD6) have a manual switch (in BIOS) that can connect the USB 3.0 chip to the processor (instead of the PCH), which did provide full-speed PCI Express 2.0
PCI Express 2.0
connectivity even then, but this meant using fewer PCI Express 2.0
PCI Express 2.0
lanes for the graphics card. However, newer boards (e.g. Gigabyte P55A-UD7 or the Asus P7P55D-E Premium) used a channel bonding technique (in the case of those boards provided by a PLX PEX8608 or PEX8613 PCI Express switch) that combines two PCI Express
PCI Express
2.5 GT/s lanes into a single PCI Express
PCI Express
5 GT/s lane (among other features), thus obtaining the necessary bandwidth from the PCH.[46][47][48] Radio frequency interference[edit] USB 3.0 devices and cables may interfere with wireless devices operating in the 2.4 GHz ISM band. This may result in a drop in throughput or complete loss of response with Bluetooth
Bluetooth
and Wi-Fi devices.[49] Various strategies can be applied to resolve the problem, ranging from simple solutions such as increasing the distance of USB 3.0 devices from Wi-Fi
Wi-Fi
routers and Bluetooth
Bluetooth
devices, to applying additional shielding around internal computer components.[50] There were some devices (for example Vivo Xplay 3S) which were promised to come with USB
USB
3.0, however ultimately didn't ship with USB 3.0, because of manufacturer's inability to resolve the electromagnetic interference caused by the USB
USB
3.0.[51] Connectors[edit] See also: USB
USB
§ Connectors

USB 3.0 Standard-A receptacle (top, in the blue color "Pantone 300C"), Standard-B plug (middle), and Micro-B plug (bottom)

A USB 3.0 Standard-A receptacle accepts either a USB 3.0 Standard-A plug or a USB 2.0 Standard-A plug. Conversely, it is possible to plug a USB 3.0 Standard-A plug into a USB 2.0 Standard-A receptacle. This is a principle of backward compatibility. The Standard-A is used for connecting to a computer port, at the host side. A USB 3.0 Standard-B receptacle accepts either a USB 3.0 Standard-B plug or a USB 2.0 Standard-B plug. Backward compatibility applies to connecting a USB 2.0 Standard-B plug into a USB 3.0 Standard-B receptacle. However, it is not possible to plug a USB 3.0 Standard-B plug into a USB 2.0 Standard-B receptacle, due to a physically larger connector. The Standard-B is used at the device side. Since USB 2.0 and USB 3.0 ports may coexist on the same machine and they look similar, the USB 3.0 specification recommends that the Standard-A USB 3.0 receptacle have a blue insert ( Pantone
Pantone
300C color). The same color-coding applies to the USB 3.0 Standard-A plug.[10]:sections 3.1.1.1 and 5.3.1.3 USB 3.0 also introduced a new Micro-B cable plug, which consists of a standard USB
USB
1.x/2.0 Micro-B cable plug, with an additional 5-pin plug "stacked" inside it. That way, the USB 3.0 Micro-B host connector preserved its backward compatibility with the USB
USB
1.x/2.0 Micro-B cable plugs. However, it is not possible to plug a USB 3.0 Micro-B plug into a USB 2.0 Micro-B receptacle, due to a physically larger connector. To be perfectly clear, you can run a device with a USB3 Micro-B socket on a USB2 Micro-B cable at USB2 speeds. Pinouts[edit]

USB 3.0 Standard-A plug (top) and receptacle (bottom), with annotated pins

The connector has the same physical configuration as its predecessor but with five more pins. The VBUS, D−, D+, and GND pins are required for USB 2.0 communication. The additional USB 3.0 pins are two differential pairs and one ground (GND_DRAIN). The two additional differential pairs are for SuperSpeed data transfer; they are used for full duplex SuperSpeed signaling. The GND_DRAIN pin is for drain wire termination and to control EMI and maintain signal integrity.

USB 3.0 connector pinouts[52]

Pin Color Signal name Description

A connector B connector

Shell N/A Shield Metal housing

1 Red VBUS Power

2 White D− USB 2.0 differential pair

3 Green D+

4 Black GND Ground for power return

5 Blue StdA_SSRX− StdB_SSTX− SuperSpeed transmitter differential pair

6 Yellow StdA_SSRX+ StdB_SSTX+

7 N/A GND_DRAIN Ground for signal return

8 Purple StdA_SSTX− StdB_SSRX− SuperSpeed receiver differential pair

9 Orange StdA_SSTX+ StdB_SSRX+

The USB 3.0 Powered-B connector has two additional pins for power and ground supplied to the device.[53]

10 N/A DPWR Power provided to device (Powered-B only)

11 DGND Ground for DPWR return (Powered-B only)

Backward compatibility[edit]

USB
USB
Micro-B USB
USB
2.0 vs USB
USB
Micro-B SuperSpeed ( USB
USB
3.0)

USB 3.0 and USB 2.0 (or earlier) Type-A plugs and receptacles are designed to interoperate. USB 3.0 Type-B receptacles, such as those found on peripheral devices, are larger than in USB 2.0 (or earlier versions), and accept both the larger USB 3.0 Type-B plug and the smaller USB 2.0 (or earlier) Type-B plug. USB 3.0 Type B plugs are larger than USB 2.0 (or earlier) Type-B plugs; therefore, USB 3.0 Type-B plugs cannot be inserted into USB 2.0 (or earlier) Type-B receptacles. Micro USB 3.0 (Micro-B) plug and receptacle are intended primarily for small portable devices such as smartphones, digital cameras and GPS devices. The Micro USB 3.0 receptacle is backward compatible with the Micro USB 2.0 plug. A receptacle for eSATAp, which is an eSATA/ USB
USB
combo, is designed to accept USB
USB
Type-A plugs from USB 2.0 (or earlier), so it also accepts USB 3.0 Type-A plugs.

USB
USB
3.1[edit] In January 2013 the USB
USB
group announced plans to update USB
USB
3.0 to 10  Gbit/s (1250 MB/s).[54] The group ended up creating a new USB specification, USB 3.1, which was released on 31 July 2013,[55] replacing the USB
USB
3.0 standard. The USB
USB
3.1 specification takes over the existing USB
USB
3.0's SuperSpeed USB
USB
transfer rate, also referred to as USB
USB
3.1 Gen 1, and introduces a faster transfer rate called SuperSpeed USB
USB
10 Gbps, referred to as USB
USB
3.1 Gen 2,[56] putting it on par with a single first-generation Thunderbolt channel. The new mode's logo features a caption stylized as SUPERSPEED+. The USB 3.1 Gen 2 standard increases the maximum data signaling rate to 10  Gbit/s (1250 MB/s), double that of SuperSpeed USB, and reduces line encoding overhead to just 3% by changing the encoding scheme to 128b/132b.[57] The first USB 3.1 Gen 2 implementation demonstrated real-world transfer speeds of 7.2 Gbit/s.[58] The USB 3.1 standard is backward compatible with USB 3.0 and  USB
USB
2.0. It defines the following transfer modes:

USB
USB
3.1 Gen 1 - SuperSpeed, 5 Gbit/s (625 MB/s) data signaling rate over 1 lane using 8b/10b encoding, the same as USB
USB
3.0. USB
USB
3.1 Gen 2 - SuperSpeed+, new 10 Gbit/s (1250 MB/s) data rate over 1 lane using 128b/132b
128b/132b
encoding.

USB
USB
3.2[edit] On 25 July 2017, a press release from the USB 3.0 Promoter Group detailed a pending update to the USB
USB
Type-C specification, defining the doubling of bandwidth for existing USB-C
USB-C
cables. Under the USB
USB
3.2 specification, existing SuperSpeed certified USB-C 3.1 Gen 1 cables will be able to operate at 10  Gbit/s (up from 5 Gbit/s), and SuperSpeed+ certified USB-C 3.1 Gen 2 cables will be able to operate at 20  Gbit/s (up from 10 Gbit/s). The increase in bandwidth is a result of multi-lane operation over existing wires that were intended for flip-flop capabilities of the Type-C connector.[59][60] The USB 3.2 standard is backward compatible with USB 3.1/3.0 and  USB
USB
2.0. It defines the following transfer modes:

USB
USB
3.2 Gen 1x1 - SuperSpeed, 5 Gbit/s (625 MB/s) data signaling rate over 1 lane using 8b/10b encoding, the same as USB
USB
3.1 Gen 1 and USB 3.0. USB
USB
3.2 Gen 1x2 - SuperSpeed+, new 10 Gbit/s (1250 MB/s) data rate over 2 lanes using 8b/10b encoding. USB
USB
3.2 Gen 2x1 - SuperSpeed+, 10 Gbit/s (1250 MB/s) data rate over 1 lane using 128b/132b
128b/132b
encoding, the same as USB
USB
3.1 Gen 2. USB
USB
3.2 Gen 2x2 - SuperSpeed+, new 20 Gbit/s (2500 MB/s) data rate over 2 lanes using 128b/132b
128b/132b
encoding.

See also[edit]

Computing portal Electronics portal

Computer
Computer
bus Extensible Host Controller Interface (XHCI) List of computer peripheral bus bit rates Mobile High-Definition Link

References[edit]

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Intel
Universal Serial Bus
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Intel
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USB
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USB
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USB
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more reliable, but no 3.0 speed boost". APC Mag. Retrieved 2010-06-22.  ^ Crothers, Brooke (2010-04-07). "Long delay expected for Intel support of USB
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3.0: Renesas Electronics* USB
USB
3.0 Firmware Updates". Downloadcenter.intel.com. Retrieved 2014-01-19. These firmware updates resolve the following issues related to the USB
USB
3.0 ports on these boards: • BIOS and operating system do not detect devices attached to the USB
USB
3.0 ports. • System hangs on POST code 58 for one minute if any device is attached to USB
USB
3.0 ports, and then continues the boot process. • In Device Manager, the Renesas* USB
USB
3.0 eXtensible Host Controller is shown with a yellow bang and the error message "Windows has stopped this device because it has reported problems. Code 43".  ^ " NEC
NEC
uPD720200 USB
USB
3.0 not working on Ubuntu 12.04". Ask Ubuntu. Retrieved 2014-01-19.  ^ "How to improve the compatibility of USB3.0 devices?". Gigabyte. Retrieved 2014-01-19.  ^ Lars-Göran Nilsson (2010-07-30). "Gigabyte adds UASP support to its USB
USB
3.0 motherboards". SemiAccurate. Retrieved 2014-01-19.  ^ Lars-Göran Nilsson (2010-08-11). "Gigabyte's UASP USB
USB
3.0 driver boosts USB
USB
2.0 performance". SemiAccurate. Retrieved 2014-01-19.  ^ Andrew Ku (2012-06-19). " USB
USB
Attached SCSI
SCSI
(UAS): Enabling Even Better USB
USB
3.0 Performance - Faster USB
USB
3.0 Performance: Examining UASP And Turbo Mode". Tomshardware.com. Retrieved 2014-01-19.  ^ Hamid, Adnan (2012-03-18). "What's the Difference Between USB
USB
UASP And BOT Embedded content from". Electronic Design. Retrieved 2014-01-22.  ^ Thomas Soderstrom (2009-12-09). "New Motherboards From Asus And Gigabyte - USB
USB
3.0 Performance: Two Solutions From Asus And Gigabyte". Tomshardware.com. Retrieved 2014-01-22.  ^ Patrick Schmid and Achim Roos (2010-08-26). "Gigabyte P55A-UD6 And UD7 ( NEC
NEC
PD720200) - Not All USB
USB
3.0 Implementations Are Created Equal". Tomshardware.com. Retrieved 2014-01-22.  ^ PLX model numbers are from the P55A-UD7 manual, page 7 and ASUS P7P55D-E Premium manual p. 2-2; the P55A-UD7 has a block diagram on page 8 ^ USB
USB
3.0* Radio Frequency Interference Impact on 2.4 GHz Wireless Devices (PDF)  ^ Lynn, Samara (2013-09-05). "Wireless Witch: The Truth About USB
USB
3.0 and Wi-Fi
Wi-Fi
Interference". PCMag.com. Retrieved 2014-07-14.  ^ 手机厂商阉割Type-C接口的真相:影响手机信号! ^ " USB
USB
3.0 Interface Bus, Cable Diagram".  100806 interfacebus.com ^ Total Phase Corporation. " USB
USB
Background". Retrieved 2016-09-11. USB 3.0 includes a variant of the Standard-B connectors which has two additional conductors to provide power to USB
USB
adapters. Image courtesy of USB
USB
Implementers Forum  ^ "SuperSpeed USB
USB
( USB
USB
3.0) Performance to Double with New Capabilities" (PDF) (Press release). Implementers Forum. 6 January 2013. Archived from the original (PDF) on 13 January 2013.  ^ "SuperSpeed USB
USB
10 Gbps – Ready for Development" (PDF) (Press release). Hillsboro, Ore. July 31, 2013. Archived from the original (PDF) on 2016-01-27.  ^ http://www.usb.org/developers/ssusb/USB_3_1_Language_Product_and_Packaging_Guidelines_FINAL.pdf ^ "SuperSpeed USB
USB
10 Gbps - Ready for Development". Rock Hill Herald. Archived from the original on 11 October 2014. Retrieved 31 July 2013.  ^ " Synopsys
Synopsys
Demonstrates Industry's First SuperSpeed USB
USB
10 Gbps Platform-to-Platform Host-Device IP Data Transfer" (Press release). Mountain View, California: Synopsys. 2013-12-10. Retrieved 2013-12-23. As measured by the Ellisys USB
USB
Explorer Protocol Analyzer, the IP realized 10 Gbps USB
USB
3.1 effective data rates of more than 900 MBps between two Synopsys
Synopsys
HAPS-70 FPGA-based prototyping systems while using backward compatible USB
USB
connectors, cables and software.  ^ Saunders, Brad; Nardozza, Liz (25 July 2017). " USB
USB
3.0 Promoter Group Announces USB
USB
3.2 Update" (PDF). USB.org. USB
USB
3.0 Promoter Group. Retrieved 27 July 2017.  ^ Bright, Peter (26 July 2017). " USB
USB
3.2 will make your cables twice as fast... once you've bought new devices". Ars Technica. Retrieved 27 July 2017. 

External links[edit]

Wikimedia Commons has media related to USB
USB
3.0.

USB
USB
3.0 Standard-A, Standard-B, Powered-B connectors pinouts, pinoutsguide.com  Supreme Port: 4 Huge Changes Coming to USB, laptopmag.com  – CES 2014 report of a laptop docking port using a single USB
USB
3.1 port to supply power, video and USB
USB
peripherals

v t e

USB

USB-IF specifications

USB
USB
3.0 USB
USB
3.1 USB
USB
3.2 USB
USB
Type-C USB
USB
On-The-Go

USB
USB
device classes

Mass storage

Flash drive FlashCard

Human interface Video Communications

Other

Enhanced mini-USB Ethernet
Ethernet
over USB USB
USB
decoration USB
USB
hub USB
USB
adapter

v t e

DC power delivery

USB
USB
based

Common External Power Supply (for mobile phones) USB
USB
Power Delivery PoweredUSB

Not USB
USB
based

AC adapter Power supply unit (computer) Universal Power Adapter for Mobile Devices (IEEE P1823) DC Power supply for notebook computer (IEC 62700)

v t e

Technical and de facto standards for wired computer buses

General

System bus Front-side bus Back-side bus Daisy chain Control bus Address bus Bus contention Network on a chip Plug and play List of bus bandwidths

Standards

SS-50 bus S-100 bus Multibus Unibus VAXBI MBus STD Bus SMBus Q-Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus InfiniBand UPA PCI Extended (PCI-X) AGP PCI Express
PCI Express
(PCIe) Direct Media Interface (DMI) RapidIO Intel
Intel
QuickPath Interconnect NVLink HyperTransport

Infinity Fabric

Intel
Intel
UltraPath Interconnect

Storage

ST-506 ESDI IPI SMD Parallel ATA
Parallel ATA
(PATA) SSA DSSI HIPPI Serial ATA
Serial ATA
(SATA) SCSI

Parallel SAS

Fibre Channel SATAe PCI Express
PCI Express
(via AHCI or NVMe logical device interface)

Peripheral

Apple Desktop Bus DCB HP-IL HIL MIDI RS-232 RS-422 RS-423 RS-485 DMX512-A IEEE-488
IEEE-488
(GPIB) IEEE-1284 (parallel port) UNI/O ACCESS.bus 1-Wire D²B I²C SPI Parallel SCSI Profibus IEEE 1394
IEEE 1394
(FireWire) USB Camera Link External PCIe Thunderbolt

Audio

ADAT Lightpipe AES3 Intel
Intel
HD Audio I²S MADI McASP S/PDIF TOSLINK

Portable

PC Card ExpressCard

Embedded

Multidrop bus CoreConnect AMBA Wishbone SLIMbus

Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest. Category

v t e

Basic computer components

Input devices

Keyboard Image scanner Microphone Pointing device

Graphics tablet Joystick Light pen Mouse

Optical

Pointing stick Touchpad Touchscreen Trackball

Webcam

Softcam

Refreshable braille display

Output devices

Monitor Refreshable braille display Printer Speakers Plotter

Removable data storage

Optical disc

CD DVD Blu-ray

Disk pack Floppy disk Memory card USB
USB
flash drive

Computer
Computer
case

Central processing unit
Central processing unit
(CPU) HDD / SSD / SSHD Motherboard Network interface controller Power supply Random-access memory
Random-access memory
(RAM) Sound card Video card Fax modem Expansion card

Ports

Ethernet FireWire (IEEE 1394) Parallel port Serial port PS/2 port USB Thunderbolt HDMI
HDMI
/ DVI / VG

.