Introduction of USB 3.1
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USB 3.1 provides faster data transfer speeds of up to 10Gbps, which is twice as fast as USB 3.0. It was created to meet the increasing needs for transferring large files like HD videos. USB 3.1 has two main goals - improved performance and backward compatibility with older USB standards. It uses a new reversible Type-C connector that allows for easier plugging and faster charging compared to previous connectors. Compliance testing also focuses on meeting the new electrical and transfer speed requirements for USB 3.1.
Introduction of USB 3.1
- 1. USB 3.1 Universal Serial Bus. Rainny rainny.tu@gmail.com 2016/08/31 update.
- 2. Agenda • Introduction – What is USB? – History of USB. • USB 3.1 – Why is USB 3.1? – Design Goals. – Compare • Type-C • Applications of Type-C • Compliance • Q&A 2
- 3. What is USB? • Universal Serial Bus. (USB) • User-friendly. • Plug-and-play way for device and host. • Do not need install device’s driver in computer. • A standard bus to connector device to host computer. 3
- 4. History of USB Jan, 1996 USB1.0 1.5Mbps Low Speed Sep, 1998 USB1.1 12Mbps Full Speed Apr, 2000 USB2.0 480Mbps Hi Speed Nov, 2008 USB3.0 5Gbps Super Speed Jul, 2013 USB3.1 10Gbps Super Speed + Logo: USB-IF 4
- 5. Why is USB 3.1? • USB / HDMI / Thunderbolt Data Rate USB3.0 has lower rate of other usual device. 5
- 6. Why is USB 3.1? • We have large data everyday. Such as HDD, DVD, BR-DVD, HD TV, Ultra HD TV. • People demand higher performance between host and peripheral. 6 • Improve EMI performance & effect. USB 3.0 will affect some device. (like wireless LAN Card)
- 7. • Smart host and simple device. • Improve power management. • Ease of use . • Backward compatibility 2.0 at Type-A connector. • Take advantage of USB 3.1 without change OS. 7 USB 3.1 Design Goals
- 8. Compare - Cable Characteristic USB3.1 USB3.0 USB 2.0 Data Interface Type-A Connector Pinout Cable Length 1 Meter 3 Meter 5 Meter PCB Trace Length 8 Inch (20.32cm) 12 Inch (30.48cm) • About Cable. 8
- 9. Compare – Data Rate Characteristic USB3.1 USB3.0 USB 2.0 Speed SuperSpeed Plus SuperSpeed HiSpeed Data Rate 10 Gbps (Gen 2) 5.0 Gbps (Gen 1) 480Mbps Encoded Mode 128b/132b 8b/10b 8b/10b Encoded Loss -3.03% (96.97%) -20% (80%) -20% (80%) Actual Rate 10Gb/s * (128/132) = 9.697Gb/s = 1.21GB/s 5Gb/s * (8/10) = 4Gb/s = 500MB/s 480Mb/s * (8/10) = 384Mb/s = 48MB/s • About Data Rate. * USB3.1 (Gen 2) real transfer speed is up to x2.4 of USB3.0. 9
- 10. Compare - Connector • Review USB 2.0 & USB 3.0 connector. 10
- 11. Type-C • About USB 3.1 connector • Type-A : the same as USB 3.0 Type A. • Type-C : Release by USB.org in 2015 April. USB.org want to let Type C become the common connector of mobile devices. • Existing USB connector is difficult to use. New connector is no directionality. 11 • Backward compatibility.
- 12. 12 • Plug-unplug over 10,000 times. • Support large power charging. (According to PD spec.) Supply peripheral or mobile device with up to 100W. Need to add ICs to control. • Increased data channels. (Ideal) Two pairs of Tx/Rx signal paths. Provide total bandwidth of 20Gbps. • Thunderbolt 3 connector. (release: June, 2015) Data rate: 40Gb/s ~= 5GB/s Type-C
- 13. • Let’s see how does it look like. 13 Type-C Photo by rainny.
- 14. Type-C • USB Type-C Pin defined. 14 Fig 2-1/2-2: USB3.1 spec. - Receptacle Configuration. - Plug Configuration. (for cable and device) - Plug can insert into receptacle. Also can rotate 180˚.
- 15. • Let’s check the receptacle side of system or device. 15 Type-C • D+/D-: signal path for USB2 only. • Vbus/GND: Power for USB. Also implement large power charging. Can deliver up to 100W. • Tx1/2, Rx1/2: 2 channels of SuperSpeed+ data links. • CC1/CC2: Configuration channel. Detect connections and interface. • SBU1/ 2: Sideband use pins. Non-USB signals. Usually used in Audio mode.
- 16. Applications of Type-C • ex. USB Type-C to DisplayPort 16 • DisplayPort can use all of the high speed paths to deliver. • Type-C side can be reversible. • Also can support HDMI, DVI, VGA cable.
- 17. Compliance • Updating compliance plans & specs. • Host/ Devices will be test for: – Support USB 2.0 speeds. – Meet Superspeed(Gen1) requirements. – Meet Superspeed+(Gen2) requirements. • USB 3.1 Compliance Requirement – New electrical test for physical layer. – New cable and connector test. 17
- 18. • Compare with the basic spec. 18 Compliance Table 6-17/ 6-19: USB3.1 spec.
- 19. • Eye Diagram. 19 Compliance Eye Diagram: USB3.1 spec.
- 20. Conclusion • High performance. USB 3.1 provide data rate up to 10Gbps, 2x of USB3.0. • Conveniently. Standard connector, has no directionality. • Less lose of encoder. Efficiency is improved up. • No driver software changes required. • EMI performance upgrade. Improved shielding and grounding of connector. 20
- 21. Thanks. 21
- 22. Q & A 22
Editor's Notes
- #7: UHD TV – 實驗中、4320p、8K解析度