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78-559: For technical specifications, Samsung DeX requires hardware such as USB 3.1 transfer specification, USB-C port with DisplayPort Alternate Mode support to be present on a mobile device. Samsung first included the DeX feature on the Galaxy S8 , and has continued to support the feature on most of their high-end smartphones, including the Galaxy S , Note and Z Fold lines. The Galaxy A90 5G

156-409: A byte or word , is referred to, it is usually specified by a number from 0 upwards corresponding to its position within the byte or word. However, 0 can refer to either the most or least significant bit depending on the context. Similar to torque and energy in physics; information-theoretic information and data storage size have the same dimensionality of units of measurement , but there

234-399: A spread-spectrum clock varying by up to 5000 ppm at 33 KHz to reduce EMI. As a result, the receiver needs to continually "chase" the clock to recover the data. Clock recovery is helped by the 8b/10b encoding and other designs. 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

312-434: A PCI Express expansion card . In addition to an empty PCIe slot on the motherboard, many "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

390-535: 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, it sends an Endpoint Ready (ERDY) to the host which then reschedules the transaction. The use of unicast and the limited number 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. USB 3.0 uses

468-486: A USB cable. As of April 2022, MacOS and Windows 7 are no longer supported. Samsung DeX devices can be managed by Samsung Knox (3.3 and higher) to allow or restrict access using the Knox platform for added control and security. In October 2019 Samsung announced that Linux on DeX will not be available for Android 10 and warned users that after upgrading to Android 10 they will not be able to downgrade, permanently losing

546-433: 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 plug 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

624-473: 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 the physically larger connector. The Standard-B plug 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

702-408: A caption stylized as SUPERSPEED+ ; this refers to the updated SuperSpeedPlus protocol. The USB 3.1 Gen 2 mode also reduces line encoding overhead to just 3% by changing the encoding scheme to 128b/132b , with raw data rate of 1,212 MB/s. The first USB 3.1 Gen 2 implementation demonstrated real-world transfer speeds of 7.2 Gbit/s. The USB 3.1 specification includes

780-613: A conducting path at a certain point of a circuit. In optical discs , a bit is encoded as the presence or absence of a microscopic pit on a reflective surface. In one-dimensional bar codes , bits are encoded as the thickness of alternating black and white lines. The bit is not defined in the International System of Units (SI). However, the International Electrotechnical Commission issued standard IEC 60027 , which specifies that

858-556: A new signal coding scheme (8b/10b symbols, 5 Gbps; also known later as Gen 1), and preserving the USB 2.0 architecture and protocols and therefore keeping the original four pins and wires for the USB 2.0 backward-compatibility, resulting in nine wires in total and nine or ten pins at connector interfaces (ID-pin is not wired). The new transfer rate, marketed as SuperSpeed USB (SS), can transfer signals at up to 5  Gbit/s with raw data rate of 500  MB/s after encoding overhead, which

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936-495: A new transfer mode called USB 3.1 Gen 2 with a signal speed of 10 Gbit/s and a raw data rate of 1212 MB/s over existing Type-A, Type-B, and USB-C connections, more than twice the rate of USB 3.0 (aka Gen 1). Backward-compatibility is still given by the parallel USB 2.0 implementation. USB 3.1 Gen 2 Type-A and Type-B connectors are usually teal-colored. USB 3.2 , released in September 2017, fully replaces

1014-431: A number of bytes which is a low power of two. A string of four bits is usually a nibble . In information theory , one bit is the information entropy of a random binary variable that is 0 or 1 with equal probability, or the information that is gained when the value of such a variable becomes known. As a unit of information , the bit is also known as a shannon , named after Claude E. Shannon . The symbol for

1092-516: A pending update to the USB Type-C specification, defining the doubling of bandwidth for existing USB-C cables. Under the USB 3.2 specification, released 22 September 2017, 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

1170-490: A single PCI Express 5 GT/s lane (among other features), thus obtaining the necessary bandwidth from the PCH. 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 and Wi-Fi devices. When manufacturers were unable to resolve the interference issues in time, some mobile devices, such as

1248-434: A tactic by Intel to favor its new Thunderbolt interface. Apple, Inc. announced laptops with USB 3.0 ports on 11 June 2012, nearly four years after USB 3.0 was finalized. AMD began supporting USB 3.0 with its Fusion Controller Hubs in 2011. Samsung Electronics announced support of USB 3.0 with its ARM -based Exynos 5 Dual platform intended for handheld devices. Various early USB 3.0 implementations widely used

1326-525: 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 2.0. Considering flow control, packet framing and protocol overhead, applications can expect 450 MB/s of bandwidth. 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 . The structural topology

1404-619: Is 150 mA, an increase from the 100 mA defined in USB 2.0. For high-power SuperSpeed devices, the limit is six unit loads or 900 mA (4.5  W )—almost twice USB 2.0's 500 mA. USB 3.0 ports may implement other USB specifications for increased power, including the USB Battery Charging Specification for up to 1.5 A or 7.5 W, or, in the case of USB 3.1, the USB Power Delivery Specification for charging

1482-468: Is a portmanteau of binary digit . The bit represents a logical state with one of two possible values . These values are most commonly represented as either " 1 " or " 0 " , but other representations such as true / false , yes / no , on / off , or + / − are also widely used. The relation between these values and the physical states of the underlying storage or device is a matter of convention, and different assignments may be used even within

1560-533: Is a result of multi-lane operation over existing wires that were intended for flip-flop capabilities of the USB-C connector. The USB 3.2 standard includes the USB 2.0 specification with four dedicated wires on the physical layer. The Enhanced SuperSpeed System encompasses both, but separated – and in parallel to the USB 2.0 implementation: Gbit The bit is the most basic unit of information in computing and digital communication . The name

1638-568: Is about 10 times faster than High-Speed (maximum for USB 2.0 standard). USB 3.0 Type-A and B connectors are usually blue, to distinguish them from USB 2.0 connectors, as recommended by the specification, and by the initials SS . USB 3.1 , released in July 2013, is the successor specification that fully replaces the USB 3.0 specification. USB 3.1 preserves the existing SuperSpeed USB architecture and protocol with its operation mode (8b/10b symbols, 5 Gbps), giving it

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1716-471: Is backward compatible with the Micro USB ;2.0 plug. A receptacle for eSATAp , which is an eSATA/USB combo, is designed to accept USB Type-A plugs from USB 2.0 (or earlier), so it also accepts USB 3.0 Type-A plugs. In January 2013 the USB group announced plans to update USB 3.0 to 10 Gbit/s (1250 MB/s). The group ended up creating a new USB specification, USB 3.1, which

1794-801: Is for drain wire termination and to control EMI and maintain signal integrity. 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

1872-549: Is implemented using a free-running linear feedback shift register (LFSR). The LFSR is reset whenever a COM symbol is sent or received. 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 3 meters (10 ft). As with earlier versions of USB, USB 3.0 provides power at 5 volts nominal. The available current for low-power (one unit load) SuperSpeed devices

1950-486: Is in general no meaning to adding, subtracting or otherwise combining the units mathematically, although one may act as a bound on the other. Units of information used in information theory include the shannon (Sh), the natural unit of information (nat) and the hartley (Hart). One shannon is the maximum amount of information needed to specify the state of one bit of storage. These are related by 1 Sh ≈ 0.693 nat ≈ 0.301 Hart. Some authors also define

2028-554: Is more compressed—the same bucket can hold more. For example, it is estimated that the combined technological capacity of the world to store information provides 1,300 exabytes of hardware digits. However, when this storage space is filled and the corresponding content is optimally compressed, this only represents 295 exabytes of information. When optimally compressed, the resulting carrying capacity approaches Shannon information or information entropy . Certain bitwise computer processor instructions (such as bit set ) operate at

2106-535: Is the first Galaxy A phone with DeX support. The feature is also available on many Galaxy Tab S models, from Galaxy Tab S4 onwards. In 2017, the original version of DeX was released, which required the use of a proprietary docking accessory called the DeX Station. This provided a USB-C port, Ethernet , HDMI 2.0 output and two USB 2.0 ports. In August 2018 with the launch of the Note 9 , Samsung introduced

2184-413: 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. 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

2262-494: Is the unit byte , coined by Werner Buchholz in June 1956, which historically was used to represent the group of bits used to encode a single character of text (until UTF-8 multibyte encoding took over) in a computer and for this reason it was used as the basic addressable element in many computer architectures . The trend in hardware design converged on the most common implementation of using eight bits per byte, as it

2340-452: Is widely used today. However, because of the ambiguity of relying on the underlying hardware design, the unit octet was defined to explicitly denote a sequence of eight bits. Computers usually manipulate bits in groups of a fixed size, conventionally named " words ". Like the byte, the number of bits in a word also varies with the hardware design, and is typically between 8 and 80 bits, or even more in some specialized computers. In

2418-492: The HP Envy 17 3D featuring a Renesas USB 3.0 host controller several months before some of their competitors. AMD worked with Renesas to add its USB 3.0 implementation into its chipsets for its 2011 platforms. At CES2011, Toshiba unveiled a laptop called " Qosmio X500" that included USB 3.0 and Bluetooth 3.0 , and Sony released a new series of Sony VAIO laptops that would include USB 3.0. As of April 2011,

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2496-566: The Inspiron and Dell XPS series were available with USB 3.0 ports, and, as of May 2012, the Dell Latitude laptop series were as well; yet the USB root hosts failed to work at SuperSpeed under Windows 8. Additional power for multiple ports on a laptop PC may be obtained in the following ways: On the motherboards of desktop PCs which have PCI Express (PCIe) slots (or the older PCI standard), USB 3.0 support can be added as

2574-708: The NEC / Renesas μD72020x family of host controllers, which are known to require a firmware update to function properly with some devices. A factor affecting the speed of USB storage devices (more evident with USB 3.0 devices, but also noticeable with USB 2.0 ones) is that the USB Mass Storage Bulk-Only Transfer (BOT) protocol drivers are generally slower than the USB Attached SCSI protocol (UAS[P]) drivers. On some old (2009–2010) Ibex Peak -based motherboards,

2652-672: 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. The USB Promoter Group announced the release of USB 3.0 in November 2008. On 5 January 2010, the USB-IF announced the first two certified USB 3.0 motherboards, one by ASUS and one by Giga-Byte Technology . Previous announcements included Gigabyte's October 2009 list of seven P55 chipset USB 3.0 motherboards, and an Asus motherboard that

2730-410: The yottabit (Ybit). When the information capacity of a storage system or a communication channel is presented in bits or bits per second , this often refers to binary digits, which is a computer hardware capacity to store binary data ( 0 or 1 , up or down, current or not, etc.). Information capacity of a storage system is only an upper bound to the quantity of information stored therein. If

2808-407: The 1950s and 1960s, these methods were largely supplanted by magnetic storage devices such as magnetic-core memory , magnetic tapes , drums , and disks , where a bit was represented by the polarity of magnetization of a certain area of a ferromagnetic film, or by a change in polarity from one direction to the other. The same principle was later used in the magnetic bubble memory developed in

2886-418: The 1980s, and is still found in various magnetic strip items such as metro tickets and some credit cards . In modern semiconductor memory , such as dynamic random-access memory , the two values of a bit may be represented by two levels of electric charge stored in a capacitor . In certain types of programmable logic arrays and read-only memory , a bit may be represented by the presence or absence of

2964-511: The DeX HDMI adapter (USB-C to female HDMI), DeX cable (USB-C to male HDMI) and DeX multiport adapter, which whilst still proprietary and containing active electronics, eliminated the need for the previous docking accessories. This design enabled the cell phone to lie flat and function as a touchpad or even continue being used as a phone in its usual fashion whilst being connected to a display and with DeX operating. Also in 2018, Samsung released

3042-559: The DeX PAD. This provided a USB-C port, HDMI and two USB ports. This design enabled the cell phone to lay flat and function as a touchpad or even continue being used as a phone in its usual fashion whilst being connected to a display and with DeX operating. Since 2019, with the Note 10 and Galaxy Fold , DeX can now be launched via a direct cable connection to a physical computer using the existing provided charging cable or any similar off-the-shelf USB-C cable with data transfer, eliminating

3120-459: The Gen ;2 operation mode are of roughly below 800 MB/s for reading bulk transfers only. The re-specification of USB 3.0 as "USB 3.1 Gen 1" was misused by some manufacturers to advertise products with signaling rates of only 5 Gbit/s as "USB 3.1" by omitting the defining generation. On 25 July 2017, a press release from the USB 3.0 Promoter Group detailed

3198-644: The Las Vegas Consumer Electronics Show (CES), including two motherboards by Asus and Gigabyte Technology . Manufacturers of USB 3.0 host controllers include, but are not limited to, Renesas Electronics , Fresco Logic, ASMedia , Etron, VIA Technologies , Texas Instruments , NEC and Nvidia . As of November 2010, Renesas and Fresco Logic have passed USB-IF certification. Motherboards for Intel 's Sandy Bridge processors have been seen with Asmedia and Etron host controllers as well. On 28 October 2010, Hewlett-Packard released

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3276-483: The Standard-A USB ;3.0 receptacle have a blue insert ( Pantone 300C color). The same color-coding applies to the USB 3.0 Standard-A plug. USB 3.0 also introduced a new Micro-B cable plug, which consists of a standard USB 1.x/2.0 Micro-B cable plug, with an additional 5-pin plug "stacked" beside it. That way, the USB 3.0 Micro-B host receptacle preserves its backward compatibility with

3354-699: The USB 1.x/2.0 Micro-B cable plug, allowing devices with USB 3.0 Micro-B ports to run at USB 2.0 speeds on USB 2.0 Micro-B cables. However, it is not possible to plug a USB 3.0 Micro-B plug into a USB 2.0 Micro-B receptacle, due to the physically larger connector. 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 five 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

3432-400: The USB 2.0 specification while fully preserving its dedicated physical layer, architecture, and protocol in parallel. USB 3.1 specification defines the following operation modes: The nominal data rate in bytes accounts for bit-encoding overhead. The physical SuperSpeed signaling bit rate is 5 Gbit/s. Since transmission of every byte takes 10 bit times, the raw data overhead is 20%, so

3510-548: The USB 3.1 specification. The USB 3.2 specification added a second lane to the Enhanced SuperSpeed System besides other enhancements, so that SuperSpeedPlus USB implements the Gen ;2x1 (formerly known as USB 3.1 Gen 2 ), and the two new Gen 1x2 and Gen 2x2 operation modes while operating on two lanes. The SuperSpeed architecture and protocol (aka SuperSpeed USB) still implements

3588-473: The Vivo Xplay 3S, had to drop support for USB 3.0 just before they shipped. 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 and Bluetooth devices, to applying additional shielding around internal computer components. A USB 3.0 Standard-A receptacle accepts either a USB 3.0 Standard-A plug or

3666-462: The ability to use full Linux applications. In 2020, wireless Dex was introduced, enabling Note 9 and newer phones to use Miracast to project the desktop experience to a PC previously connected via USB or a wireless monitor/TV. A few manufacturers (NexDock, HP, UPerfect and others) have created “LapDocks”, which are essentially laptop shells with no CPU, RAM, disk or OS. They function as an external monitor, keyboard and trackpad while supplying power to

3744-424: The average. This principle is the basis of data compression technology. Using an analogy, the hardware binary digits refer to the amount of storage space available (like the number of buckets available to store things), and the information content the filling, which comes in different levels of granularity (fine or coarse, that is, compressed or uncompressed information). When the granularity is finer—when information

3822-679: The binary digit is either "bit", per the IEC 80000-13 :2008 standard, or the lowercase character "b", per the IEEE 1541-2002 standard. Use of the latter may create confusion with the capital "B" which is the international standard symbol for the byte. The encoding of data by discrete bits was used in the punched cards invented by Basile Bouchon and Jean-Baptiste Falcon (1732), developed by Joseph Marie Jacquard (1804), and later adopted by Semyon Korsakov , Charles Babbage , Herman Hollerith , and early computer manufacturers like IBM . A variant of that idea

3900-597: 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 P55A-UD4 or P55A-UD6) have a manual switch (in BIOS) that can connect the USB 3.0 chip to

3978-415: The early 21st century, retail personal or server computers have a word size of 32 or 64 bits. The International System of Units defines a series of decimal prefixes for multiples of standardized units which are commonly also used with the bit and the byte. The prefixes kilo (10 ) through yotta (10 ) increment by multiples of one thousand, and the corresponding units are the kilobit (kbit) through

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4056-457: The electrical state of a flip-flop circuit. For devices using positive logic , a digit value of 1 (or a logical value of true) is represented by a more positive voltage relative to the representation of 0 . Different logic families require different voltages, and variations are allowed to account for component aging and noise immunity. For example, in transistor–transistor logic (TTL) and compatible circuits, digit values 0 and 1 at

4134-414: 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. 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 prevent transmissions from generating electromagnetic interference (EMI). Scrambling

4212-654: 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 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 (2.0 or 3.0) and eSATAp interfaces. To ensure compatibility between motherboards and peripherals, all USB-certified devices must be approved by

4290-579: The host device up to 100 W. Starting with the USB 3.2 specification, USB-IF introduced a new naming scheme. To help companies with branding of the different operation modes, USB-IF recommended branding the 5, 10, and 20 Gbit/s capabilities as SuperSpeed USB 5Gbps , SuperSpeed USB 10 Gbps , and SuperSpeed USB 20 Gbps , respectively. In 2023, they were replaced again, removing "SuperSpeed" , with USB 5Gbps , USB 10Gbps , and USB 20Gbps . With new Packaging and Port logos. The USB 3.0 Promoter Group announced on 17 November 2008 that

4368-475: The label USB 3.1 Gen 1 . USB 3.1 introduced an Enhanced SuperSpeed System – while preserving and incorporating the SuperSpeed architecture and protocol (aka SuperSpeed USB ) – with an additional SuperSpeedPlus architecture adding and providing a new coding schema (128b/132b symbols) and protocol named SuperSpeedPlus (aka SuperSpeedPlus USB , sometimes marketed as SuperSpeed+ or SS+ ) while defining

4446-409: The level of manipulating bits rather than manipulating data interpreted as an aggregate of bits. In the 1980s, when bitmapped computer displays became popular, some computers provided specialized bit block transfer instructions to set or copy the bits that corresponded to a given rectangular area on the screen. In most computers and programming languages, when a bit within a group of bits, such as

4524-528: The need for any proprietary docking accessories. DeX has also been used in the public safety setting to replace in-vehicle laptops. Samsung also announced "Linux on Galaxy" (since renamed to "Linux on DeX") which allows use of a compatible Linux distribution rather than the default Android OS giving full personal computer capabilities. The DeX Desktop can also be accessed with a downloadable app for Windows and macOS or through third party accessories. Users are able to connect to their mobile devices with

4602-716: The one-lane Gen 1x1 (formerly known as USB 3.1 Gen 1 ) operation mode. Therefore, two-lane operations, namely USB 3.2 Gen 1x2 (10 Gbit/s with raw data rate of 1 GB/s after encoding overhead) and USB 3.2 Gen 2x2 (20 Gbit/s, 2.422 GB/s), are only possible with Full-Featured USB Type-C Fabrics (24 pins). As of 2023, USB 3.2 Gen 1x2 and Gen 2x2 are not implemented on many products yet; Intel, however, starts to include them in its LGA 1200 Rocket Lake chipsets (500 series) in January 2021 and AMD in its LGA 1718 AM5 chipsets in September 2022, but Apple never provided them. On

4680-472: The other hand, USB 3.2 Gen 1x1 (5 Gbit/s) and Gen 2x1 (10 Gbit/s) implementations have become quite common. Again, backward-compatibility is given by the parallel USB 2.0 implementation. 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

4758-473: The output of a device are represented by no higher than 0.4 V and no lower than 2.6 V, respectively; while TTL inputs are specified to recognize 0.8 V or below as 0 and 2.2 V or above as 1 . Bits are transmitted one at a time in serial transmission , and by a multiple number of bits in parallel transmission . A bitwise operation optionally processes bits one at a time. Data transfer rates are usually measured in decimal SI multiples of

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4836-557: The phone. USB 3.1 Universal Serial Bus 3.0 ( USB 3.0 ), marketed as SuperSpeed USB , is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices. It was released in November 2008. The USB 3.0 specification defined a new architecture and protocol, named SuperSpeed, which included a new lane for providing full-duplex data transfers that physically required five additional wires and pins, while also adding

4914-552: The processor (instead of the PCH), which did provide full-speed PCI Express 2.0 connectivity even then, but this meant using fewer 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 2.5 GT/s lanes into

4992-401: 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: USB 3.0 has transmission speeds of up to 5 Gbit/s or 5000 Mbit/s, about ten times faster than USB 2.0 (0.48 Gbit/s) even without considering that USB 3.0

5070-401: The raw byte rate is 500 MB/s, not 625. Similarly, for Gen 2 link the encoding is 128b/132b, so transmission of 16 bytes physically takes 16.5 bytes, or 3% overhead. Therefore, the new raw byte-rate is 128/132 * 10 Gbit/s = 9.697 Gbit/s = 1212 MB/s. In reality any operation mode has additional link management and protocol overhead, so the best-case achievable data rates for

5148-580: The release of the Panther Point chipset. Some industry analysts have claimed that Intel was slow to integrate USB 3.0 into the chipset, thus slowing mainstream adoption. These delays may be due to problems in the CMOS manufacturing process, a focus to advance the Nehalem platform, a wait to mature all the 3.0 connections standards (USB 3.0, PCIe 3.0 , SATA 3.0 ) before developing a new chipset, or

5226-415: The same device or program . It may be physically implemented with a two-state device. A contiguous group of binary digits is commonly called a bit string , a bit vector, or a single-dimensional (or multi-dimensional) bit array . A group of eight bits is called one  byte , but historically the size of the byte is not strictly defined. Frequently, half, full, double and quadruple words consist of

5304-473: The specification of version 3.0 had been completed and had made the transition to the USB Implementers Forum (USB-IF), the managing body of USB specifications. This move effectively opened the specification to hardware developers for implementation in future products. The first USB 3.0 consumer products were announced and shipped by Buffalo Technology in November 2009, while the first certified USB 3.0 consumer products were announced on 5 January 2010, at

5382-415: The states of electrical relays which could be either "open" or "closed". When relays were replaced by vacuum tubes , starting in the 1940s, computer builders experimented with a variety of storage methods, such as pressure pulses traveling down a mercury delay line , charges stored on the inside surface of a cathode-ray tube , or opaque spots printed on glass discs by photolithographic techniques. In

5460-554: The symbol for binary digit should be 'bit', and this should be used in all multiples, such as 'kbit', for kilobit. However, the lower-case letter 'b' is widely used as well and was recommended by the IEEE 1541 Standard (2002) . In contrast, the upper case letter 'B' is the standard and customary symbol for byte. Multiple bits may be expressed and represented in several ways. For convenience of representing commonly reoccurring groups of bits in information technology, several units of information have traditionally been used. The most common

5538-556: The two possible values of one bit of storage are not equally likely, that bit of storage contains less than one bit of information. If the value is completely predictable, then the reading of that value provides no information at all (zero entropic bits, because no resolution of uncertainty occurs and therefore no information is available). If a computer file that uses n  bits of storage contains only m  <  n  bits of information, then that information can in principle be encoded in about m  bits, at least on

5616-462: The two stable states of a flip-flop , two positions of an electrical switch , two distinct voltage or current levels allowed by a circuit , two distinct levels of light intensity , two directions of magnetization or polarization , the orientation of reversible double stranded DNA , etc. Bits can be implemented in several forms. In most modern computing devices, a bit is usually represented by an electrical voltage or current pulse, or by

5694-507: The unit bit per second (bit/s), such as kbit/s. In the earliest non-electronic information processing devices, such as Jacquard's loom or Babbage's Analytical Engine , a bit was often stored as the position of a mechanical lever or gear, or the presence or absence of a hole at a specific point of a paper card or tape . The first electrical devices for discrete logic (such as elevator and traffic light control circuits , telephone switches , and Konrad Zuse's computer) represented bits as

5772-477: The use of a logarithmic measure of information in 1928. Claude E. Shannon first used the word "bit" in his seminal 1948 paper " A Mathematical Theory of Communication ". He attributed its origin to John W. Tukey , who had written a Bell Labs memo on 9 January 1947 in which he contracted "binary information digit" to simply "bit". A bit can be stored by a digital device or other physical system that exists in either of two possible distinct states . These may be

5850-632: Was cancelled before production. Commercial controllers were expected to enter into volume production in the first quarter of 2010. On 14 September 2009, Freecom announced a USB 3.0 external hard drive. 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 slot addition) at the CES in Las Vegas Nevada. The Linux kernel mainline contains support for USB 3.0 since version 2.6.31, which

5928-558: Was released in September 2009. FreeBSD supports USB 3.0 since version 8.2, which was released in February 2011. Windows 8 was the first Microsoft operating system to offer built in support for USB 3.0. In Windows 7 support was not included with the initial release of the operating system. However, drivers that enable support for Windows 7 are available through websites of hardware manufacturers. Intel released its first chipset with integrated USB 3.0 ports in 2012 with

6006-419: Was released on 31 July 2013, replacing the USB 3.0 standard. The USB 3.1 specification takes over the existing USB 3.0's SuperSpeed USB transfer rate, now referred to as USB 3.1 Gen 1 , and introduces a faster transfer rate called SuperSpeed USB 10  Gbps , corresponding to operation mode USB 3.1 Gen 2 , putting it on par with a single first-generation Thunderbolt channel. The new mode's logo features

6084-469: Was the perforated paper tape . In all those systems, the medium (card or tape) conceptually carried an array of hole positions; each position could be either punched through or not, thus carrying one bit of information. The encoding of text by bits was also used in Morse code (1844) and early digital communications machines such as teletypes and stock ticker machines (1870). Ralph Hartley suggested

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