Super-Speed USB Interface Bus Description, USB Pinout and Signal Names. Universal Serial Bus

Universal Serial Bus

Super-Speed USB Interface

[USB Description]
[USB Interface ICs]
[USB Pinout] [USB Connector]
[USB Standard / Organizations]
[Converter, Adapter, Cables]
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SuperSpeed USB Description

The USB [Universal Serial Bus] 3.0 specification defines the Mechanical, Electrical and Protocol layers of the interface. Cables and connectors are fully defined and retain backward compatibility with the USB 2.0 Type-A connectors. USB defines 2 types of hardware, Hubs and Functions. Revision 3.0 of the USB standard is called SuperSpeed USB. Up to 127 devices may be connected together in a tiered Star topology. The limiting factor being 7 address bits. The physical wire segments are point-to-point between a Host, Hub, or Function. The system may only have one Host, which connects to a Hub. A USB Hub may connect to another Hub or to a USB Function. Each layer transition from Hub to Hub represents another Tier. USB Hubs allow connection to a USB bus, while USB Functions are the devices which perform some function.

As of January 2010 products supporting USB3.0 are starting to be released.

The USB bus is a [Differential] Bi-directional serial interface cable bus. Differential NRZI data is transmitted Isochronous or Asynchronous between devices. Data is transferred at three different rates over a maximum cable length of 4 meters ~ over 4 wires, 2 of which carry data on a balanced twisted pair.
SuperSpeed USB [3.0] allows operation up to 4.8Gbps, and while operating in the compatibility mode USB [2.0] may operate at any speed from 10kbps to 480Mbps in one of three speed modes. A Slow-Speed mode of 10kbps to 100kbps is used for devices such as a USB keyboard or USB mouse. Full-Speed mode is used by most devices and allows a transfer rate of 500kbps to 10Mbps. High-Speed mode allows rates of up to 480Mbps, with a speed range of 25Mbps to 400Mbps. Transmission at the High-Speed mode requires the addition of 45 ohm termination resistors between each data line and ground. Operation at Full-Speed mode is 2.8 volts [High] to 0.3 volts [Low]. Operation at High-Speed mode is at 400mV +/-10% [High] to 0V +/- 10mV {Low]. Cable impedance for both modes is 90 ohms +/- 15% (differential).

Four different (packet) protocols are used; Control, Interrupt, Isochronous and Bulk. Each exchange contains 3 packets; A token packet which holds the address, a data packet which holds the data, and a handshake packet which terminate the exchange.
NRZI produces a change in the signal indicating a logic zero, no change indicates a logic one. Bit stuffing is used with NRZI to stop the signal remaining in the steady state condition; if more then 6 ones are transmitted (no change in the signal) a zero is inserted to produce a transition. NRZI, with bit stuffing is self clocking, allowing the receiver to synchronize with the transmitter.

USB 3.0 (Super-Speed USB) increases the data rate to 4.8 Gbit/s, 600 MB/s. USB 3.0 ports and cabling are designed to enable backward compatibility as well as future-proofing for optical capabilities (USB 3.0 adds fiber), although the fiber was dropped around 2007. USB 3.0 connectors contain legacy pins to interface to USB 2.0 devices, and a new set of pins for USB 3.0 connectivity (both sets reside in the same connector). Simultaneous operation of SuperSpeed and non-SuperSpeed modes is not allowed in peripheral devices. USB 3.0 devices are able to connect to either USB 3.0 or 2.0 devices, and USB 2.0 devices may connect to either USB 2.0 or 3.0 devices. The new USB 3.0 interfaces are two differential pairs, one pair for transmit and one pair for receiving data [like PCIe].

Note; the first USB 3.0 flash drive will be released in December 2009, but there are no USB 3.0 compatible computers.

{USB Bus Index}

USB Standard and Specifications

The Universal Serial Bus specification was first released in 1994.
The current USB standard, Revision 2.0 was released in 2000.
Revision 3.0 (Superspeed USB), the newest version was just released in 2008.

Extensible Host Controller Interface [xHCI] Draft Specification for USB 3.0 [09/08]
{Describes the register-level host controller interface for USB}

USB 3.0 Specification
Provides both version 3.0 and version 2.0 and 1.1 of the USB Standard

USB 2.0 Specification {USB.org}
Provides both version 2.0 and version 1.1 of the USB Standard

micro-USB Description {micro-USB description and devices}

Wireless USB description and details. USB w/ wireless access

There are two different IC USB standards; HSIC, and Inter-IC USB

VoIP Phone Manufacturers {USB Voice of IP devices}

{USB Bus Index}

USB 3.0 Bus Interface IC Manufacturers

This is a list of revision 3.0 USB IC Manufacturers. For revision 1.1 and 2.0 compliant IC's refer to USB 2.0

Fresco Logic
{Single-chip PCI Express to USB 3.0 host adapter, integrating a SuperSpeed PHY and a host controller conforming to eXtensible Host Controller Interface (xHCI) specification.}

Genesys Logic
{USB 3.0 host controller, in the works}

LucidPort Technology, Inc.
{Single chip USB 3.0 to SATA-II Bridge Controller with integrated USB and SATA PHYs}

NEC Electronics
{USB 3.0 host controller, compliant with the USB 3.0 and xHCI. µPD720200}

Currently there are not many manufacturers that are producing USB 3.0 compliant ICs.
USB 3.0 devices are not expected until 2010, so Integrated Circuits should start showing up in late 2009.

IC Manufacturers {All other types}

{USB Interface Bus Index}

USB Pinout

Super USB Connector

**USB A Pinout, Cable Assembly**
Pin	Signal Name	Description
1	VBUS	Red
2	D-	White
3	D+	Green
4	GND	Black
5	StdA_SSRX-	Blue
6	StdA_SSRX+	Yellow
7	GND_DRAIN	GROUND
8	StdA_SSTX-	Purple
9	StdA_SSTX+	Orange
Shell	Shield	Connector Shell

The five new pins were situated deeper in the connector than the legacy pins, allowing the deeper new connector to connect the extra pins,
while legacy plugs in new sockets, or new plugs in legacy sockets, would use only the original four.
The USB pinout is the same for either a type A or B connector, the difference is in the shape.

{USB Interface Bus Index}

USB Connector Manufacturers

(Type A/B, Male/Female)

Four different types: the (A/B) Jacks are used on the chassis side, and the (A/B) Plugs are used on the cable ends. Type A jacks connect to type A plugs, and type B jacks connect to type B plugs. Normally Hubs will have an A jack. Cables will have an A plug on one end an a B plug on the opposite end. The connectors have both pins 1 and 4 longer then 3 and 4, so power and ground mate first. Having the power and ground pins mate first allow devices to be Hot-Swappable. Type A connectors point to the Hub, while type B connectors point to the Function. Normally a cable will have a type A connector on the computer side [Hub] and a USB type B connector on the far [function] side, to a USB device. The cable pinout and signal names are shown in the table below [90 ohms +/-15% differential impedance]:

micro-USB Connector Manufacturers

ACON {USB plugs and receptacles SMT and Thru-hole. Mini USB 5Pin(one ID Pin), 0.8mm pitch, super mini connector}

AIM Electronics

Amphenol {Board/Cable Mount Receptacles}

Cypress Industries {USB Connector Manufacturer}

FCI {USB Connectors}

Keystone {USB Type A/B Sockets, USB Type A/B Plug}

Kycon

ITT Cannon {USB Series A/B Connectors, USB Cable Plug Assemblies}

Molex {USB Connector Manufacturer}

NAIS {USB Series A, 1-Port, 2-Port, DIP/SMD Connector]

Newnex Technology Corp. {USB Connectors-Cable Assemblies}

OUPIIN America Inc. {Type A, B USB Connectors}

Panasonic Electric Works Corporation of America {USB Series A - B connectors}

Power Dynamics {USB Type A Connector Manufacturer}

Samtec {USB-B, USBR-B, USB-A, USBR-A (USB Receptacles), USB-AM (USB Plug), MUSB (Mini USB Receptacle)}

Switchcraft {Single/dual USB connectors}

Tyco Electronics {USB Connectors}

{USB Bus Index}

USB Cable Assemblies and Adaptors

Cable is 4 wire. The data wires are 28 AWG, the power wires are 20 to 28 AWG. Two power lines are un-twisted and 2 data lines, twisted. Longer cables will use 20 AWG for power. The wire are color coded per the drawing above. Cables will have an A plug on one end an a B plug on the opposite end. The maximum cable length is 5 meters; however that can be increased by using Hubs. The USB interface is designed to operate down to -20 degrees C.

No manufacturers of USB 3.0 cables or cable assemblies currently listed.

Here is a list of possible USB Devices.

Engineering Design Key words: USB, Universal Serial Bus, Transceiver, Physical Layer, Description, Products, Index, Listing,
Company, Companies, USB pinout, PHY,Electrical, 2-wire, Pin Out, Vendors, Manufacturers, Electrical Standard,
Interface Standard, Specification, Spec, Circuit layout, Electrical Interface, Semiconductor IC manufacturers,
Physical Interface, Engineering Description, electrical characteristics, Integrated Circuit Component Manufacturers,
Personal Computer Bus, physical Cable Bus, USB Pinouts, HCD, USBD


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