USB 3.0
 The Super-Speed USB logo |
|||
| Type | USB | ||
|---|---|---|---|
| Production history | |||
| Designed | December 2008 | ||
| Manufacturer | Hewlett-Packard, NEC, Microsoft, Intel, and Agere Systems | ||
| General specifications | |||
| Width | 3–6 mm | ||
| Data | |||
| Data signal | Yes | ||
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This article's factual accuracy may be compromised due to out-of-date information. Please help improve the article by updating it. There may be additional information on the talk page. (December 2011) |
USB 3.0 is the third major revision of the Universal Serial Bus (USB) standard for computer connectivity. In the late 1990s, the first major revision was made to the USB 1.1 specification. It was done by adding a new transfer speed called High Speed (HS – 480 Mbit/s) to the earlier speeds (Low Speed (LS) – 1.5 Mbit/s and Full Speed (FS) – 12 Mbit/s). That revision was called USB 2.0.
The USB 3.0 specification uses the same concepts of USB 2.0 but with many improvements and totally different implementation. Earlier USB concepts like endpoints and four transfer types (bulk, control, isochronous and interrupt) are preserved but the protocol and electrical interface is significantly different. It is so different that 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 – added a new transfer type call Super Speed or SS – 5 Gb/s (electrically it is more similar to PCIe Gen2 than USB 2.0)
more bandwidth – instead of one-way communication, USB 3.0 uses two unidirectional data paths: one to receive data and the other to transmit.
power management – U0 through U3 link power management states are defined.
improved bus utilization – a new features is added (using packets NRDY and ERDY) to let a device asynchronously notify the host of its readiness (no need of polling)
support to rotating media – 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, which is 10 times faster than USB 2.0 (480 Mbit/s). USB 3.0 significantly reduces the time required for data transmission, reduces power consumption, and is backwards compatible with USB 2.0. The 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 Implementers Forum (USB-IF), the managing body of USB specifications.[1] 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 January 5, 2010, at the Las Vegas Consumer Electronics Show (CES), including two motherboards by ASUS and Gigabyte Technology.[2][3]
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 was the only company to have passed USB-IF certification, although Fresco Logic has now[when?] also passed USB-IF certification. Motherboards for Intel's Sandy Bridge processors have been seen with Asmedia and Etron host controllers as well. On October 28, 2010, Hewlett-Packard released the HP Envy 17 3D featuring a Renesas USB 3.0 host controller several months before some of their competitors. AMD is working with Renesas to add its USB 3.0 implementation into its chipsets for its 2011 platforms.[dated info] At CES2011, Toshiba unveiled a laptop called "Toshiba Qosmio X500" that included USB 3.0 and Bluetooth 3.0, and Sony released a new series of Sony VAIO laptops that will include USB 3.0. As of April 2011, the Inspiron and Dell XPS series are available with USB 3.0 ports.
Contents |
[edit] Architecture and features
In USB 3.0 dual-bus architecture is used to allow both USB 2.0 (HIGH Speed/LOW Speed/FULL Speed) and USB 3.0 (Super Speed) operations to take place simultaneously, thus providing backward compatibility. Connections are such that they also permit forward compatibility, that is, run USB 3 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.
[edit] Data transfer and synchronization
The SuperSpeed transaction is initiated by the host making a request followed by a response from the device. The device either accepts the request or rejects it. If accepted then device sends data or accepts data from the host. If the endpoint is halted, the device shall respond 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 then, it will send an Endpoint Ready (ERDY) to the host which will then reschedule the transaction.
The use of unicasting and the limited multicasting of packets, combined with asynchronous notifications, enables links that are not actively passing packets to be put into reduced power states, allowing for better power management.
[edit] Data encoding
The "SuperSpeed" bus provides a transfer mode at 5.0 Gbit/s additionally to the three existing transfer modes. The raw throughput is 4 Gbit/s, and the specification considers it reasonable to achieve 3.2 Gbit/s (0.4 GB/s or 400 MB/s) or more.
All data is sent as a stream of eight bits which are scrambled and then converted into 10-bit format. This helps to reduce electromagnetic interference (EMI). The exactly opposite process is carried out at the receiving end. Scrambling is implemented using a free running Linear Feedback Shift Register (LFSR). The LFSR is reset whenever a COM symbol is sent or received.
It is still going to be tethered to 16 feet (maximum) cables with active repeaters for extended lengths. So far, USB 3.0 still runs on copper cabling with most likely the same inherent limitations.[4]
[edit] Availability
[edit] Adding to existing equipment
USB 3.0 support can be added to existing laptop computers with only USB 2.0 and Expresscard support by using an Expresscard-to-USB 3.0 adapter to supply USB 3.0 signal support. Although the PCI Express port that the Express card connects cannot supply power of itself, the Express card and hence the USB 3 ports nevertheless derive power from the USB 2 port that it additionally connects to as part of the interface. If the express card has more than one USB 3 port then only 100mA is available from each port. Additional power for multiple ports 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 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 support can be added as an expansion card to a desktop motherboard with PCI Express. (Similar cards are available for the older PCI standard, but few are available and they are more expensive.) If faster connections to storage devices are the reason to consider USB 3.0, an alternative is to use instead storage devices using eSATAp and add an inexpensive bracket adding an eSATAp port to the motherboard. Some external drives support both USB (2.0 or 3.0) and eSATAp with an exchangeable adapter, so the same drive can be used with a USB 3.0 laptop.[3] 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 on the market.[5]
On 5 January 2010, USB-IF announced the first two certified USB 3.0 motherboards, one by Asus and one by Gigabyte.[3][6] Previous announcements included Gigabyte's October 2009 list of seven P55 chipset USB 3.0 motherboards,[7] and an ASUS motherboard that was cancelled before production.[8]
Commercial controllers were expected to enter into volume production in the first quarter of 2010.[9] On 14 September 2009, Freecom announced a USB 3.0 external hard drive.[10] On 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 Nevada.[11][12]
Drivers are under development for Windows 7, but support was not included with the initial release of the operating system.[13] However, drivers are available for Windows through manufacturer websites. The Linux kernel has supported USB 3.0 since version 2.6.31, which was released in September 2009.[14][15][16]
Windows 8 will have inbuilt support for USB 3.0.[17]
Intel decided not to support USB 3.0 until 2011,[18] which will slow down mainstream adoption. Apple, Inc., a major manufacturer of computers still has yet to ship a single computer with USB 3.0 compatible ports. Apple computers made since switching from PowerPC to Intel processor technology have used only Intel processors and "bridge" chipsets because only Intel chipsets so-far support the newer EFI firmware technology required by the Mac OS X operating system software. Thus, Intel's lack of support for USB 3.0 proves to be a primary reason why Apple has yet to ship any computers with USB 3.0 capable ports. These delays may be due to problems in the CMOS manufacturing process,[19] a focus to advance the Nehalem platform,[20] a wait to mature all the 3.0 connections standards (USB 3.0, PCIe 3.0, SATA 3.0) before developing a new chipset,[21][22] or a tactic by Intel to favor its new Thunderbolt interface.[23] AMD road maps indicated that the new southbridges released in the beginning of 2010 would not support USB 3.0.[19]
[edit] Speed issues
There have been many reports of USB 3.0 equipment only transferring data at USB 2.0 speed, usually with a message "This USB Mass Storage Device can transfer information faster if you connect it to a Super-Speed USB 3.0 port". This has been due to several causes, including drivers, certain cables specified as USB 3.0 (problems disappeared when a different cable was used), order of starting equipment, equipment needing to be disconnected and reconnected, and overclocked computers.[24]
[edit] Connectors
[edit] Standard-A
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's possible to plug USB 3.0 Standard-A plug into a USB 2.0 Standard-A receptacle. The Standard-A is used for connecting to the computer port.
The connector has the same physical configuration as its predecessor but with more pins for USB 3.0. The VBUS, D-, D+, and GND pins are required for USB 2.0 support, while for USB 3.0 Standard-A connector, five more pins are included–two differential pairs and one ground (GND_DRAIN). The two additional differential pairs are for SuperSpeed data transfer, that support dual simplex SuperSpeed signaling; while the GND_DRAIN pin is for drain wire termination, and to control EMI and maintain signal integrity. Since USB 2.0 and USB 3.0 ports may coexist on the same machine and look similar, the USB 3.0 connector is blue (Pantone 300C) in colour.
| Pin | Color | Signal name ('A' connector) |
Signal name ('B' connector) |
|---|---|---|---|
| 1 | Red | VBUS | |
| 2 | White | D− | |
| 3 | Green | D+ | |
| 4 | Black | GND | |
| 5 | Blue | StdA_SSRX− | StdA_SSTX− |
| 6 | Yellow | StdA_SSRX+ | StdA_SSTX+ |
| 7 | Shield | GND_DRAIN | |
| 8 | Purple | StdA_SSTX− | StdA_SSRX− |
| 9 | Orange | StdA_SSTX+ | StdA_SSRX+ |
| Shell | Shell | Shield | |
| PIN NO. | SIGNAL NAME | DESCRIPTIONS |
|---|---|---|
| 1 | VBUS | POWER |
| 2 | D- | USB 2.0 DIFFERENTIAL PAIR |
| 3 | D+ | |
| 4 | GND | Ground for Power Return |
| 5 | StdB_SSTX- | Superspeed transmitter differential pair |
| 6 | StdB_SSTX+ | |
| 7 | GND_DRAIN | Ground for signal return |
| 8 | StdB_SSRX- | Superspeed receiver differential pair |
| 9 | StdB_SSRX+ | |
| 10 | DPWR | Power provided by device |
| 11 | DGND | Ground return to DPWR |
| Shell | Shield | Connector metal |
[edit] See also
[edit] References
- ^ "USB‐IF" (PDF). http://www.usb.org/press/USB-IF_Press_Releases/2008_11_17_USB_IF.pdf. Retrieved 2010-06-22.
- ^ "First Certified USB 3.0 Products Announced". PC World. 2010-01-07. http://www.pcworld.com/article/186209/first_certified_usb_30_products_announced.html?tk=rel_news. Retrieved 2010-06-22.
- ^ a b c (PDF) SuperSpeed USB Consumer Cert Final 2, USB‐IF, http://www.usb.org/press/SuperSpeed_USB_Consumer_Cert_FINAL_2_.pdf.
- ^ "USB 3.0 Data Transfer Redefined". Gadgetronica.com. 2012-02-08. http://gadgetronica.com/technopedia/USB-3.0-Data-Transfer-Redefined.html.
- ^ "USB 3". Lecroy. http://www.lecroy.com/tm/solutions/serialdata/usb3/. Retrieved 2010-06-22.
- ^ Both Gigabyte and Asus claimed the "first" USB 3.0 motherboard, Gigabyte, USA, 2010-01-04, http://www.gigabyte.us/News/Motherboard/News_List.aspx?NewsID=1509[dead link] and Asus, USA, 2010-01-06, http://usa.asus.com/News.aspx?N_ID=8avVkB0IqOx0m8Pr, while the official announcement, USB-IF, 2010-01-05, http://www.usb.org/press/SuperSpeed_USB_Consumer_Cert_FINAL_2_.pdf.
- ^ Gibabyte, TW, http://www.gigabyte.com.tw/News/Motherboard/News_List.aspx?NewsID=1486[dead link].
- ^ "Asus cancels its first usb 3.0 motherboard". The Inquirer. http://www.theinquirer.net/inquirer/news/1495417/asus-cancels-usb-motherboard. Retrieved 2010-06-22.
- ^ "Digitimes". 2009-04-15. http://www.digitimes.com/news/a20090415PB204.html. Retrieved 2010-06-22.
- ^ "Freecom.com". http://www.freecom.com/news.asp?id=9205&catName=press. Retrieved 2010-06-22.[dead link]
- ^ Ngo, Dong (2010-01-05). "Seagate ships USB 3.0-based external hard-drive kit for laptops | CES". CNET. http://ces.cnet.com/8301-31045_1-10420360-269.html. Retrieved 2010-06-22.
- ^ "BlackArmor PS 110 with USB 3.0 | Portable Hard Drive for Business with Backup Software". Seagate. http://www.seagate.com/www/en-us/products/external/blackarmor/blackarmor_ps_110_usb3/?intcmp=bac-en-us-home-h_hero1-baps110kit. Retrieved 2010-06-22.[dead link]
- ^ "USB in MS Windows 7 more reliable, but no 3.0 speed boost". APC Mag. http://apcmag.com/usb_in_windows_7_more_reliable_but_no_30_speed_boost.htm. Retrieved 2010-06-22.
- ^ "Kernel newbies". 2009-09-09. http://kernelnewbies.org/Linux_2_6_31. Retrieved 2010-06-22.
- ^ "Erste USB 3.0 Treiber [First USB 3 drivers coming with Linux 2.6.31]". DE: Heise. 2009-12-03. http://www.heise.de/newsticker/Erste-USB-3-0-Treiber--/meldung/140103. Retrieved 2010-06-22.
- ^ "First driver for USB 3.0". Linux magazine. 2009-06-09. http://www.linux-magazine.com/online/news/first_driver_for_usb_3_0. Retrieved 2010-06-22.
- ^ http://channel9.msdn.com/Events/BUILD/BUILD2011/HW-256T
- ^ "EE Times". http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=220700486. Retrieved 2010-06-22.
- ^ a b (in German) Spekulationen über Verzögerungen bei USB 3.0, DE: Heise, http://www.heise.de/newsticker/meldung/Spekulationen-ueber-Verzoegerungen-bei-USB-3-0-835980.html
- ^ Paul Mah (2009-10-23). "Fiercecio.com". Fiercecio.com. http://www.fiercecio.com/techwatch/story/insider-intel-hindering-usb-3-0-adoption/2009-10-23. Retrieved 2010-06-22.
- ^ "FAQ — PCI Express 3.0". PCI SIG. 2009-07-01. http://www.pcisig.com/news_room/faqs/pcie3.0_faq/. Retrieved 2010-06-22.
- ^ "PCIe 3.0 Specification Coming Soon". Enterprise storage forum. 2010-05-05. http://www.enterprisestorageforum.com/technology/news/article.php/3880536. Retrieved 2010-06-22.
- ^ "Intel delays USB 3.0 support until 2011". Techspot. 2009-10-22. http://www.techspot.com/news/36673-intel-delays-usb-30-support-until-2011.html. Retrieved 2010-06-22.
- ^ USB 3.0 with "The Device can perform Faster", Tom's hardware, http://www.tomshardware.com/forum/259843-32-device-perform-faster.
- ^ a b "USB 3.0 Interface Bus, Cable Diagram". http://www.interfacebus.com/usb-cable-diagram-30.html. 100806 interfacebus.com
[edit] External links
- USB 3.0 Standard-A, Standard-B, Powered-B connectors pinouts, Pinouts guide, http://pinoutsguide.com/Slots/usb_3_0_connector_pinout.shtml.
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