USB3.1在技术和电气测试上的挑战

Reference Documents • Universal Serial Bus 3.1 Specification (Revision 1.0, July 26, 2013) • Universal Serial Bus Type-C Cable and Connector Specification (Revision 1.0, August 11, 2014)
USB3.1 Technical and Electrical measurement Challenges
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BFSK and BMC System
BFSK over Vbus (Type A and B), BMC over CC ( Type-C)
USB3.1 Technical and Electrical measurement Challenges
USB3.1 Technical and Electrical measurement Challenges
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Test solution for Power Delivery
Test Setup 2: CC Electrical & Protocol Decode Testing
Keysight Scope With GRL-USB-PD
USB 3.1 Technical and Electrical measurement Challenges
Jan. 28, 2015
Francis Liu 劉宗琪 Senior Project Manager Application Engineer Org. 是德科技
Disclaimer
The USB 3.1 compliance test requirements are not final. Therefore, all opinions, judgments, recommendations, etc. that are presented herein are the opinions of the presenter of the material and do not necessarily reflect the opinions of the USB-IF, or other member companies.
USB3.1 Technical and Electrical measurement Challenges
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Agenda
• Introduction • USB Type-C Connector and Power Delivery(PD) • USB 3.1 Transmitter test challenges • USB 3.1 Receiver test challenges
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USB Type-C Power Options
Sink/source can be swapped, power direction no longer fixed
USB3.1 Technical and Electrical measurement Challenges
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CH1
10X Passive or Diff Probe
CH2
Note: Scope GND needs to be established on only one side of link
USB3.1 Technical and Electrical measurement Challenges Page 19
• •
Rd used to sense UFP attach Advertise Type-C current
DFP default : Host , Power provider
UFP default : Device , Power consumer
USB3.1 Technical and Electrical measurement Challenges
USB Power Delivery Architecture Overview and Signaling
Provider Consumer
• • • •
Over Vbus for USB Type A and B --- BFSK (Binary Frequency Shift Keying) Over CC for USB Type-C --- BMC (Biphase Mark Coding) Voltage, Current and Direction negotiated Half Duplex, Bitrate=300kbps, 4b/5b coding
USB3.1 Technical and Electrical measurement Challenges
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Type-C Functional Model – Un-flipped straight through
CC wire determines the orientation through the cable: P(1) <->P(1)
• • • • USB is the most successful interface in the history of PC Device charging over USB has become a major consumer feature USB installed base is 10+ billion units and growing at 3+ billion units a year Adoption is virtually 100% in PC and peripheral categories
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USB PD Signaling - BFSK
Type-A/B Connector over VBUS : BFSK
• • • • • • Binary Frequency Shift Keying 23.2MHz Carrier 150mV AC coupled FSK Modulation, Δf =500 KHz Bit rate = 300kpbs 4b/5b coding
• Flipping and swapping
Sideband Use (AUX +/-for DP Alt Mode)
USB3.1 Technical and Electrical measurement Challenges
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The Key to the Type C
USB Type-C Configuration Channel (CC)
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Type C Connector, Power Delivery, and Alt Modes
Source: IDF14 Fra bibliotekNETS002), Intel
USB3.1 Technical and Electrical measurement Challenges
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Type C Connector
Type-C
USB3.1 Technical and Electrical measurement Challenges
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Type-C Functional Model – Un-flipped twisted through
CC wire determines the orientation through the cable: P(1) <->P(2)
USB3.1 Technical and Electrical measurement Challenges
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Type C Functional Pin-out
Looking into the product receptacle :
Looking into the cable or product plug :
Type-C
USB3.1 Technical and Electrical measurement Challenges
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Type-C Host Detected Connection states
Pull-Up/Pull-Down CC Model
Powered Cables introduce Ra at the “unwired” CC pins which are used to indicate the need for Vconn over one of those pins
Functional highlights
• Lot of new pins • Accessory Mode • Alternate Modes (DP 1.3, MHL 4.0, TBT) • Two power source, Vbus and Vconn • Power Delivery to 100 Watts
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Test solution for Power Delivery
Keysight partnering with GRL for PD electrical analysis tool development
• • • • • USB-PD eMark Cable Testing CC Electrical measurement & Protocol decode testing USB-PD Power Provider Stress USB-PD Power Consumer test Wilder Technologies developing new PD breakout fixture GRL–USB-PD