USB 3.1 Command Verifier Compliance Test Specification Version ...
Introduction of USB 3.1
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Transcript of Introduction of USB 3.1
USB 3.1Universal Serial Bus.
[email protected]/08/31 update.
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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
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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.
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History of USB
Jan, 1996
USB1.01.5Mbps
Low Speed
Sep, 1998
USB1.112Mbps
Full Speed
Apr, 2000
USB2.0480MbpsHi Speed
Nov, 2008
USB3.05Gbps
Super Speed
Jul, 2013
USB3.110Gbps
Super Speed +
Logo: USB-IF
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Why is USB 3.1?• USB / HDMI / Thunderbolt Data Rate
USB3.0 has lower rate of other usual device.
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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.• Improve EMI performance & effect.
USB 3.0 will affect some device. (like wireless LAN Card)
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• 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.
USB 3.1 Design Goals
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Compare - CableCharacteristic USB3.1 USB3.0 USB 2.0
Data Interface
Type-AConnector Pinout
Cable Length 1 Meter 3 Meter 5 Meter
PCB Trace Length 8 Inch (20.32cm) 12 Inch (30.48cm)
• About Cable.
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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 Rate10Gb/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.
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Compare - Connector• Review USB 2.0 & USB 3.0 connector.
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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.
• Backward compatibility.
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• 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
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• Let’s see how does it look like.
Type-C
Male FemalePhoto by rainny.
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Type-C• USB Type-C Pin defined.
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˚.
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• Let’s check the receptacle side of system or device.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.
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Applications of Type-C• ex. USB Type-C to DisplayPort
• DisplayPort can use all of the high speed paths to deliver.• Type-C side can be reversible.• Also can support HDMI, DVI, VGA cable.
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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. USB 3.1 Signal
Function Validation of Key
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• Compare with the basic spec.
Compliance
Table 6-17/ 6-19: USB3.1 spec.
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• Eye Diagram.Compliance
Eye Diagram: USB3.1 spec.
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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.
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Thanks.
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Q & A