� Engineers’ Guide to USB Technologies 2010

The most obvious difference in Super-Speed USB is the 10x speed increase from 480 Mbps to 5 Gbps. Although USB 2.0 high-speed (and even USB full-speed [12 Mbps] and low-speed [1.5 Mbps]) are more than adequate for many applications, for others the USB connection can become a bottleneck. The 5-Gbps data rate of SuperSpeed USB should provide headroom for the next five years.

The increased speed presents issues for existing USB 2.0 cables, however. SuperSpeed USB requires a shielded differential pair (SDP) cable to ensure signal integrity and minimize EMI. The physical layer electrical signaling has changed from the simple two-wire system to a dual-simplex data path. This is done over a completely different set of connections, whereas the exist-ing USB 2.0 two-wire interface remains untouched. It was mandatory that any changes in the electrical signaling scheme not drive the need for a new form factor plug or receptacle on the host, nor (if possible) on the peripheral as well. To minimize risk, the signaling scheme leverages much of the PCI Express Gen 2 specification.

Another key change is improved bus power efficiency. This is ideal for extending the battery life of portable devices, whether hosts or peripherals.

SuperSpeedUSB Reference Guide

What is SuperSpeed USB?

The specification defines excellent power characteristics, especially for idle links. Both upstream and down-stream ports can initiate lower power states of the link. Local power manage-ment control uses multiple link power states to further improve power efficiency. Another power-saving method eliminates all polling of devices. The faster data transfer time, combined with the focus on better power efficiency, results in SuperSpeed USB requiring only 1/3rd the power of USB 2.0 high-speed to transmit the same amount of data.

Key to the SuperSpeed USB standard is backwards compatibility with USB 2.0 as much as possible. As mentioned, SuperSpeed USB signaling occurs over separate conductors versus those used for USB 2.0. Adding five new conduc-tors on the insert side of the existing plugs and receptacles allows for the same mechanical interface as USB 2.0 and enables full backward compatibility.

Along with mechanical backward compatibility, the goal was to maintain the extensive device driver infrastructure. The same data transfer types – interrupt, bulk and isochoronous – were main-tained. Finally, this standard preserves existing USB ease-of-use expectations.

D+

D-

USB 2.0 UnshieldedTwisted Pair

USB 3.0 ShieldedTwisted Pair

USB 3.0 ShieldedTwisted Pair

ShieldBraid

GNDRX+

RX- TX- TX+GND

GND

VBUS

www.ti.com/tusb1310

5 contact blades;0.7 wide, 1.0 pitch

www.eecatalog.com/usb �

Applications and benefitsThe increased speed reduces user wait time when transferring data from com-puters to portable consumer devices. End users desire an excellent sync-and-go experience as they use such content-rich portable devices as music players, video players, digital cameras and camcorders. The increase in size of rich content drives an increase in the storage capacity as well. Anywhere and at anytime is very compelling.

Where will SuperSpeed USB be used? Any place where high-capacity storage is needed to perform fast data sync-and-go to the computer.

Flash DriveStandard-Definition

Movie Flash DriveHigh-Definition

Movie

Typical file size 1 GB 6 GB 16 GB 25 GB

USB full-speed 22 min 2.2 hours 5.9 hours 9.3 hours

USB high-speed 33 sec 3.3 min 8.9 min 13.9 min

SuperSpeed USB 3.3 sec 20 sec 53.3 sec 70 sec

DescriptionThe TUSB1310 is a SuperSpeed USB transceiver that integrates both a USB 3.0 physical layer and a USB 2.0 physical layer. It implements industry-standard digital interfaces for connecting to the USB core-en-abled processor, controller or FPGA. PIPE3 is used for the SuperSpeed signal path, while ULPI is the path for high-speed, full-speed and low-speed signals.

Features and benefits

application spaces.

enables easy system integration with attached core.

-eration enables use of a single low-cost crystal.

equalizer design allows for simpler board layout and longer cable usage.

TUSB1310: SuperSpeed USB transceiver

USB PortHS/FS/LS Signals

(480Mbps)SS Signals

(5Gbps)

USB 2PHY

USB SSPHY

ULPIInterface

PIPE3Interface

ULPICore

PIPE3Core

USB 2PHY

USB SSPHY

ULPICore

PIPE3Core

The goal for sync-and-go operations is to take less than 90 seconds, the “threshold of pain” for many end users.

Many portable devices use flash mem-ory for storage. Capacity will continue to increase, both because of customer demand and the dramatic increase in flash capacity, as well as reduced cost. Therefore, flash-based peripherals will benefit (and ultimately require) the much higher SuperSpeed USB data rates. This includes the most commonly used USB peripheral – the ubiquitous flash drive. The table below summarizes the user experience enhancement in moving from USB full-speed to high-

speed, then to SuperSpeed USB. SuperSpeed USB enables well under 90 seconds for most sync-and-go applications.

In summary, any multimedia application that wants to move lots of files – or just large files quickly to and from the PC – will benefit greatly from SuperSpeed USB. It delivers the bandwidth to sat-isfy user needs to sync multimedia files with portable consumer products today, as well as providing the needed head-room to do the same for flash-based products for the next five years.

How fast is 5 Gbps?

www.ti.com/tusb1310

� Engineers’ Guide to USB Technologies 2010

Features and benefits

Increased number of available SuperSpeed ports.Interoperability with latest high-performance USB peripherals.Full backward- and forward-compatibility of all ports in a system.

DescriptionThe TUSB8040 is a SuperSpeed hub device that provides one upstream port and four downstream ports in compliance with USB specifica-tion version 3.0. Fully compliant USB transceivers are integrated for all upstream and downstream ports. The downstream ports sup-port both SuperSpeed USB and USB 2.0 connections, automatically routing through the hub logic to the appropriate upstream connection according to the speed of the device attached to the ports.

TUSB8040: SuperSpeed USB hub

Upstream USB PortHS Signals(480Mbps)

SS Signals(5Gbps)

USB SS/HS/FS/LS Ports

USB 2PHY

USB 2Hub Logic

USB 2PHY

USB 2PHY

USB SSPHY

USB SSHub Logic

USB SSPHY

USB SSPHY

Features and benefits

with all host platforms and the latest high-performance storage drives to enable ultra-fast, sync-and-go user experience.

SATA revision 2.6-compliantUSB 2.0 HS/FS and USB 3.0 SS

transport

generation enables use of a single low-cost crystal.

equalizer design allows for simpler board layout and longer cable usage.

DescriptionThe TUSB9260 is a SuperSpeed USB function controller with integrated USB compliant transceivers. It is intended as a USB-to-SATA bridge for storage devices using the SATA interface.

The TUSB9260 is designed to use both the fast performance of the state machine and the programma-bility and flexibility of the embedded microcontroller (MCU) and firmware. With the elaborate balance between the MCU and the state machine, it provides a bridge solution to meet both performance and flexibility requirements of next-generation external storage devices

TUSB9260: SuperSpeed USB-to-SATA bridge

USB PortHS/FS Signals

(480Mbps)SS Signals

(5Gbps)

USB 2PHY

USB SSPHY

ARMCortex

M3

MemorySubsytem

SATA Port(1.5 or 3.0 Gbps)

USB Controller Interface

SATA IIPHY

SATA II Controller

generation enables use of a single low-cost crystal.

equalizer design allows for simpler board layout and longer cable usage.

www.ti.com/tusb1310

www.eecatalog.com/usb �

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