USB Developer Days 2016

VESA – DisplayPortTM Alternate
Mode on USB-CTM - Technical
Overview
Jim Choate
VESA Compliance Program Manager
HoustonSeptember 27 – 28, 2016

September 27 – 28, 2016

USB Implementers Forum © 2016

USB Developer Days 2016

Agenda• Introduction• DisplayPort Technology Roadmap• DisplayPort Alternate Mode on USB-C Technical Overview• Compliance• Demo• Summary

USB Type-CTM and USB-CTM are trademarks of USB Implementers Forum

September 27 – 28, 2016

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About VESAVESA is the Video Electronics Standards Association
Global industry alliance with more than 230 member
companies
Mission is to develop, promote and support an ecosystem of vendors and certified interoperable
products for the electronics industry
Facilitates display related standards development, publication and compliance testing, as well as
promotion and marketing
Develops Open standards, contribution is open to all companies at all stages of development

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Example of VESA Members

September 27 – 28, 2016

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Display Trends and DisplayPort Roadmap
2006

2007

2008

2009

2010

1080p

2011

2012

2013

2014

4K 30Hz

2015

2016

4K 60Hz

Y ou
a re
he re

4K 60Hz

Notebook PC

2880x1800
Quad HD

DP 1.0-1.1
Up to Quad HD

DP 1.2Up to 4K 60Hz, 10 bit color

2.7 Gbit/sec

5.4 Gbit/sec

Link Rate per Lane

8K 120Hz
HDR

4K 60Hz
HDR
1080p

2020

8K 60HzHDR

5K 60HzPC Monitors

1680x1050

2018 2019
8K 60HzHDR

4K 60Hz
HDR

Televisions

1080p

2017

4K 60Hz8K 120Hz
HDR
5K 60Hz?

4K 60Hz
HDR

DP 1.4Up to 8K
DP 1.3Up to 5K
8.1 Gbit/sec

September 27 – 28, 2016?
DP XX
Up to 8K
120Hz
10 Gbit/sec

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DisplayPort Specification Summary§ The VESA DisplayPort Standard, Version 1.4, was released on March 1, 2016
§ Replaces DisplayPort Version 1.2a/DP1.3 for new designs§ Backward compatible, offers new optional features§ New Silicon supporting HBR3 is under deployment and certification testing has
started§ DisplayPort 1.4 New Features§ Forward Error Correction§ Adds DSC, Audio extensions, improved MST functionality, Adaptive Sync
§ 30 bit color; 8K 4:4:4, 7680X4320 @60Hz – Single Cable

September 27 – 28, 2016

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DP 1.4 Link Rate Increase
DP Version
Introduction

Link RateName

Bit rate

Max Resolution Support(24 bpp, 60Hz Refresh, 4:4:4 format)

Max Resolution Support(24 bpp, 60Hz Refresh, 4:2:0 format)

DP 1.0RBR

1.62 Gbps

1920x1080

Not supported

HBR

2.7 Gbps

2560x1600

Not supported

DP 1.2HBR2

5.4 Gbps

4K x 2K

Not supported

DP 1.3/1.4

HBR3

8.1 Gbps

5K x 3K

8K x 4K

Total useable data transfer rate for DP 1.4 = 25.92 Gbps
8.1 Gbps link rate, per lane
x 0.8 to account for 8b/10b transport coding overhead
x 4 maximum number of available lanes
25.92 Gbps total usable data transfer rate
September 27 – 28, 2016

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Optimization for Shared Interface Use• Numerous specification enhancements to simplify the use of DisplayPort
as an ingredient in the following interface examples:• The USB-C connector, using the DisplayPort Alt Mode
• VESA DockPort Standard• VESA Mobility DisplayPort Standard (MyDP)• VESA Embedded DisplayPort Standard (eDP)• ThunderBolt 3.0• Wireless interfaces

September 27 – 28, 2016

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DisplayPort 1.4 Continues to Support Other Features that are
Unique to DisplayPort• Multiple monitors using Multi-Stream• High-definition audio formats• Adaptive Sync
• Protocol converters to VGA, DVI, or HDMI
• Low voltage, AC coupled interface compatible with sub-micron process
geometry, simplifying integration• Data scrambling and fixed link rates simplify EMI and RFI mitigation

September 27 – 28, 2016

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Progression of Display Experience
with DisplayPort

DP 1.0/1.1 (4/2007) – HBR1
• A setup driven by 6 Mini-DP
connectors at 2560x1600@60Hz
on single graphics card

DP 1.2 (12/2009) – HBR2
• UHD – 4K
• 30 bit color; 3840x2160@60Hz• Tiled Display: 4Kx2K single cable• Tiled Display: 5Kx3K Dual Cable• AdaptiveSync

DP 1.4 (3/20016) – HBR3 & DSC• UHD – 8K
DP 1.3 (9/20014) – HBR3
• 30b color; 8K 444 (7680x4320) @60Hz• HDR, PQ Gamma, BT 2020
– Single Cable• HDCP 2.2, 420• VR – 4K + 120Hz + USB3.1 + Pwr• Tiled Display: 8K 444 Dual Cable• 5Kx3K@60 and 4k@120Hz Single Cable • Multi Display Docking with DP Alt
Mode on USB-C• Single cable for DP A/V, power and• Dynamic HDR Meta
data using DP Alt Mode on USB-C

September 27 – 28, 2016

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DisplayPort Alternate Mode on
USB-C Overview andCertification

September 27 – 28, 2016

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VESA DisplayPort Alternate Mode on USB-C Summary• The VESA DisplayPort Alt Mode Standard, Version 1.0a , was released on
Aug 10, 2015
• Enables the use of the USB-C interface for DisplayPort• DisplayPort Alternate Mode is a functional extension of the USB-C
interface• Developed in liaison with the USB 3.0 Promoter Group• The DisplayPort Alternate Mode over USB-C Compliance Test
Specification draft is under General Member Review with expected
release next quarter

September 27 – 28, 2016

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Example USB Type-C Configurations
Either end can serve as USB Host, USB-PD Power Consumer, and DisplayPort Video Source (these services are
independent of each otherDevice Charging
USB

Device Charging
USB 2.0 or 3.1 Data

Dock

Display Data
Device Supplying PowerUSB 2.0 or 3.1 Data

Display Data
September 27 – 28, 2016

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USB-C with DP Alt Mode Ecosystem Deployment Underway
DP Alt Mode Products
Dell XPS 13/15
Apple MacBook

LG 27UD88 4K display

StarTech 4 in 1 Adapter

HP Pro Tablet 608 G1

Many different adapters available•

C to DP adapters, Multifunction docks•

Type C protocol converters (HDMI, VGA, DVI) using DP Alt Mode

Google Chromebook Pixel

More are expected soon

Microsoft Lumia 950 and 950XL
Smartphones§

Major PC continue to launch new products with DP Alt Mode over USB-C§

Thunderbolt includes USB 3.1 + DP Alt Mode as standard compatibility modes

September 27 – 28, 2016

LG G5

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Wide Range of Cables/DP Alt Mode Adapters
Shipping TodayStandard USB-C to USB-C Cable

USB-C to DP
USB-C to VGA

USB-C to DVI
USB-C to HDMI
These adapters enable the use of the vast installed base of legacy displays for the increasing numbersof systems that support DisplayPort Alternate Mode over USB-C.

September 27 – 28, 2016

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USB-C Connector Functional Extension
DisplayPort Alternate ModeUSB Host

With DisplayPort Alternate
Mode Capability

USB Type-C
Connector

DisplayPortor
USB 3.1 Data
USB Type-C to Type-C Cable

Power Deliveryor

USB Device (or Dock)
With DisplayPort Alternate Mode
Capability

USB Type-C
Connector• A passive Full Feature USB Type-C to Type-C cable can carry up to four
DisplayPort lanes• Same performance and features as a standard DisplayPort connection• Allows DisplayPort data rates to increase in the future, since the USB Type-C
connector has very high data rate capability• DisplayPort can be combined with USB 3.1 operation over the same USB
Type-C cable• USB 2.0 and USB Power Delivery is available in all configurations

September 27 – 28, 2016

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USB Type-C Receptacle Pins
• Below is a diagram of the pins defined for system or device receptacle
High Speed Data Path (TX for USB, orfor DP Alt Mode)

Cable GroundCable
Bus Power

USB 2.0
Interface

High Speed Data Path
(RX for USB, or TX for DP Alt Mode)

For Sideband Use(not used for USB)
DP Aux for Alt
ModePlug Configuration Detection• One becomes VCONN, for cable oradaptor power• CC is used for USB-PD
communication

September 27 – 28, 2016

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USB Developer Days 2016

USB 2.0
SSTX

DisplayPort and USB 3.1
over a Standard USB-C Cable

USB 3.1

USB-C Device with
DisplayPort Source

SSRX

USB-C Device with
DisplayPort Sink

DP Lane 0
Type-C
Connector

DP Lane 1
DisplayPort(such as phone, tablet, PC,
set-top box, game console,or output of docking stationor AV Receiver)

AUX+, AUXCC, HPD
VBUS
GND

ID

Type-C
Connector(such as monitor, TV, or
input into docking station,or AV Receiver )• Uses a standard “Full Feature” USB-C to USB-C cable which is designed toinclude DisplayPort• The above configuration uses two high-speed lanes each for DisplayPort
and USB 3.1• Ideal for docking stations, or for displays or TVs that include USB 3.0 functions• DisplayPort performance provided by two lanes• DP v1.2 (existing Source devices): Two 1080p displays, or one 4k@30Hz• DP v1.4 (HBR3 Source devices): 4K@60, or HDR 4K@60 using 4:2:0 and 12bpp• 4 Lanes of DisplayPort available if only USB 2.0 implemented in Sink
• Support for 4K@60, or two 2560x1600, or four 1080p
September 27 – 28, 2016

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Example USB-C PHY Port Configuration Switch
for Systems with DisplayPort Source• Equalization and re-drivers for the SS USB and DisplayPort signals
increase margins• Compensates for loss in PCB traces and switch, increases system design
flexibly and compliance margin• Routes signals according to plug orientation and use of SS USB and/orDP• Similar switch neededat source side
USB Host System with DisplayPort Source

PS8 7 4 0

USB TX / DP TX

EQ

USB RX

Displa yPort
So u r c e

DP TX

EQ

DP TX

EQ

DP TX

EQ

DP TX

EQ

USB RX / DP TX

EQ

USB TX / DP TX

USB RX / DP TX
EQAUXInt erc ept ion

De v i c e Co n t r o l
T h r o u g h Pi n Co n f i g
o r I 2 C Sl a v e Po r t

September 27 – 28, 2016

De v i c e
Co n t r o l

DP AUX

USB Type-C Receptacle

USB TX

Sw it c h Mat rix

U SB
Co n t r o l l e r

SuperSpeed USB
With DP Alt Mode

Co n t r o l
Re g i s t e r s

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Supported cable types• USB-C to USB-C• USB-C to DP• USB-C to Protocol converter• USB-C to Docking station or embedded hub solution• USB-C to DP cables must include logic to support USB PD and DP
connection detect protocols.
DP Signaling
USB-PD

HPD

PD Controller

DP• Protocol converters must support some optional features in DP 1.3
specification
DP Signaling
USB-PDUSB
PD

HDMI Signaling

HDMI• Protocol converters translate source DP signals to the respective protocol supported

Protocol Converter

September 27 – 28, 2016

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DisplayPort Over a USB Type-C to USB Type-C Full Feature
Passive Cable
Cable
DisplayPort
SourceUSB
Type-C
Connector

SSTX1

DP Lane 2

SSRX1

DP Lane 3

SSTX2

DP Lane 1

SSRX2

DP Lane 0

USB 2.0
SBU1/2

AUX+, AUX-

CC, HPD / VCONN

USB
Type-C
Connector

DisplayPort
Sink

ID

VBUS
GND

• Utilizes optional DisplayPort Alt Mode capability of USB Type-C connector• DisplayPort can use all four high speed lanes to deliver full DisplayPort
performance• The DisplayPort AUX Channel uses the SBU pins
• The DisplayPort HPD / IRQ is transmitted over the CC pin using the USB-PC
protocol• USB 2.0 and USB Power Delivery always available
September 27 – 28, 2016

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USB Developer Days 2016

USB Type-C to DisplayPort Adapter Cable
Cable

USB
Type-C
Connector

SSTX1

DP Lane 0

SSRX1

DP Lane 1

SSTX2

DP Lane 2

SSRX2

DP Lane 3

SBU1

AUX+

AUXSBU2
CC, HPD
ID
VCONN

•
•
•
•
•

DisplayPort
Connector

HPD Signal
Conversion

Standard DPorMini DP
Connector

HPD

Uses DisplayPort Alt Mode capability of USB Type-C connector
Cable must be reversible, works in either direction; four lanes of DisplayPort
Supports legacy DisplayPort Source and Sink Devices
Detected by USB Type-C enabled device that supports DP Alt ModeNo support for USB (other than USB Billboard) or other alt modes– These features are not supported by legacy DisplayPort devices
September 27 – 28, 2016

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USB Type-C to HDMI, DVI and VGA
Adapter Cables / Cable Adapters
Cable

DP Lane 0
DP Lane 1
DP Lane 2

DisplayPort
SourceUSB
Type-C
Connector

DP Lane 3
AUX+
AUXHPD
CC
VCONN

•
•
•
•
•

ID

DisplayPort
To
HDMI, DVI,
or VGA
Converter

LegacyConnector or
Receptacle

HDMI,
DVI,
or VGA
Display

USB PD
Controller

Uses DisplayPort Alt Mode capability of USB Type-C connector
Adapter Cable: USB Type-C plug on one end, legacy plug on other end
Adapter: USB Type-C plug on one end, legacy receptacle on other end
USB Type-C will NOT support DisplayPort Dual Mode (DP++)USB Type-C to HDMI Converters support up to HDMI 2.0 and CEC

September 27 – 28, 2016

Both styles
are available

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Example Docking Configurations using the
USB Type-C DisplayPort Alternate Mode
Simple Docking Configuration
Docking Station
USB Type-C Enabled
USB Host and
DisplayPort SourceUSB
Type-CUSB
Type-CUSB
Repeater

Legacy USB

DP
Repeater

Legacy DP
Power

More Complex Docking Configuration
Docking Station

USB
Type-CUSB
Type-CUSB Hub
DisplayPort
BranchDP to HDMI
Converter

Switch / Mux

USB Type-C Enabled
USB Host and
DisplayPort Source

Legacy USB
USB
Type-C
LegacyUSB
USB
Type-C
LegacyUSB
Legacy DP
HDMI
Power

September 27 – 28, 2016

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DisplayPort Alternate Mode Compliance Test Plan
• VESA is developing the DP Alternate Mode compliance test incoordination with the USB-IF• Compliance test specification (CTS) is under under general membershipreview• Draft 1.0 expected to release next quarter• The objective is to enable compliance testing for USB Type-C, and the DP
Alt Mode for USB Type-C, at the same ATCs enabling the use of a single
test station• Certification of many DisplayPort Alternate Mode enabled products is inprogress at GRL and Allion ATCs
September 27 – 28, 2016

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Certification Test Coverage
Test plan and CTS covers all features and supported pin assignments.
• USB PD Compliance Testing• Demonstration of proper functionality/behavior for DP Alt Modes• A device must pass DisplayPort Alt Mode USB-PD certification tests to receive DP
certification• Electrical testing of all supported modes with PHY test fixtures• USB PHY electricals• USB 3.1 Gen1 5G• USB 3.1 Gen2 10G (if supported)• USB 2.0 480Mb/s• DP PHY electricals (DP 1.2b CTS)

• RBR
• HBR
• HBR2 (HBR3 compliance requirements under development)• Aux Channel

September 27 – 28, 2016

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Certification Test Coverage (continued)• USB 3.1 Interop testing (functional)• USB 3.1 Link testing• Full DP certification testing using reference Adapters• Interoperabilty testing• Interop testing with a required matrix of products and adapters that are available.
• Testing with reference USB-C to DP adapters is required.
• Testing with reference DP Alt Mode over USB-C reference sources and sinks is required.

• Link layer testing• EDID testing• MST testing if supported• Certification testing of USB 3.1 functionality not duplicated if productvendor provides VESA USB-IF Compliance Test ID
September 27 – 28, 2016

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Cable & Adapter testing• Certification testing of cables/adapters• USB-C to USB-C cables certified via USB-IF• USB Type C to DP cable• Electrical testing• Interoperability testing• Link Layer testing• Protocol converters (all protocol converters are DP sinks)• Receiver testing• USB PD testing• Link Layer Sink tests• Interoperability tests
September 27 – 28, 2016

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VESA Synchronization with USB-IF Compliance Test
Program• Coordinate certification plans, test coverage and timing for early
products• Avoid scheduling conflicts• Participate in USB-IF certification and interoperability events• VESA will continue to participate in USB-IOP events and workshops

September 27 – 28, 2016

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VESA PlugTest Events in 2016
• PlugTests have significant value to member companies. Particularly as new
capabilities and products are deployed.
• VESA planned to host three PlugTests in 2016. The third event this year is in
Taiwan.
• November Taiwan event introduced workshop pre-cert testing• Objectives of 2016 Plugtests• Demonstrate and improve interoperability• Particularly important for new product capabilities• Test DP 1.4 and DP Alt Mode over USB Type-C• Verify Test Equipment Correlation• Dates/Locations:• Done: March 23-26th 2015, Milpitas CA• Done: September 14th-17th 2015, Embassy Suites Burlingame CA• Planned: Taiwan December 12-16th, Westin Taipei

September 27 – 28, 2016

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Logo Useage Guidlines• No change to existing DP product logo guidelines• For DP over USB-Type C products• DP certification includes subset of testing requirements of USB-IF• Requirement to use new fixtures and DP over USB Type-C
adapters• Refer to VESA DisplayPort logo useage guidelines forfurther information• Refer to the USB-IF Trademark License Agreement for
further information• VESA is working with the USB-IF to create additional logo
guidelines as well as common product description
terminology
September 27 – 28, 2016

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Compliance Test Issues
Common compliance testing problems encountered• DP Alt Mode PHY Compliance• OS specific toolset are often required to properly get into test modes• Some products/chipsets do not support Test Automated over Aux• This is being addressed in new methodology under developer, the Link
Training Test Automation Mode.

• USB-PD testing issues• Specification has been changing• New tests added to draft CTS have uncovered implementation issues• DP Alt Mode CTS USB-PD Test 10.1.2 Status update Command Test failures.
The test fails if the Status field is invalid• A number of other issues have been identified at recent USB-IOP events and
VESA PlugTest events. Tests will be added to verify product compliance.
September 27 – 28, 2016

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Compliance Test Issues• 1 or 2 lane configuration compatibility issues• Source and sink chipset issues uncovered during interoperability testing of
DP Alt Mode products using USB-C docks.
• Issue occurs when Dock is configured in 2 lane mode to support 2 lanes of DP and 2
lanes for USB 3.1• Sources fail if they don’t implement fallback rules in DP 1.4 specification• Sinks fail if they don’t support reduced lane operation or if they don’t
correctly report CR and/or Link EQ/Alignment failures on unconnectedlanes• Billboard implementations: many products have not updated to Billboard
latest requirements• Compliance tests are under development to address these issues
September 27 – 28, 2016

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Billboard Compliance Testing• Download
USB3CV from
USBIF
developers
page• X32 or X64• Install on
system withxHCI
(no Alt Mode
Support)• Select
Billboard tests
and runSeptember 27 – 28, 2016

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DP Alt Mode PHY Testing
Test Setup for DP PHY testing using DP Aux Test Automation
DP PHY test

DP TPAsAUX PHY test

Connector:DP ormDP

DP cable

Aux Reference
Controller
AUX Automation

DP HBR2 PHY test
Connector:Type C

Keysight TPAs
AUX PHY test
USB-C to DP cable

Unigraf DPR-100

Fixtures

Test Setup for DP PHY testing using Link Training Test Automation
September 27 – 28, 2016

AUX Automation

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Summary of DP Alt Mode over USB-C supported features
FeatureSupports HDMI 1.4b displays
Supports 4K 30 Hz displays
No adapter required for connection from USB Type-C
to standard HDMI TV
Supports HDMI 2.0 displays
Supports 4K 60 Hz displays
Supports High Dynamic Range
Supports multiple video streams
Connects to USB-C enabled displays that are shippingnow (DisplayPort Alt Mode enabled)
Supports USB SuperSpeed concurrent with video
display
Supports simple adapter for connection to existing
HDMI cables
Avoids rewiring of pre-installed HDMi cables
Supports HDR
Supports 4K 60 Hz full color (4:4:4)
Supports 4K 60Hz deep color
Supports multiple 4K videos

DisplayPort
Alt Mode
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓

FeatureSupports High Dynamic Range
Supports 4K high refresh rate (120Hz)
Supports 8K video (with HBR3 plus DSC)
Low latency interactive VR experience with 90+ 4K+
with DP + USB 3.0
Supports USB Type-C on TV
Runs on USB Type-C to USB Type-C cables
Connects to wide range of already deployed USB-C
devices
Use Cases
Multi 4k display productivity with single cable docking
Low latency Interactive VR experience with dual
4k>90Hz + Power + USB 3.1 (HBR3+DSC)
Smooth low latency gaming with AdaptiveSync
8k HDR workstation productivity with DP + DSC

DisplayPort
Alt Mode
✓
✓
✓
✓
✓
✓
✓

✓
✓
✓
✓

DisplayPort 1.4 along with DP Alt Mode over USB-C & DSC can do today what
you want your products to do tomorrow.
September 27 – 28, 2016

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Demos

September 27 – 28, 2016

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Summary• DP 1.4 introduced many new capabilities and products are underdevelopment and in the certification process for these new features• Many Certified USB-C devices with DP Alt Mode are shipping withmany more in development• DP Alt Mode CTS is under General Member Review and will be
published by VESA in Q4’2016.
• DP Alt Mode device certification is available from certified ATCs since2015, allowing use of DP logo
• Final 2016 VESA PlugTest event is in Taiwan December 12-16th 2016

September 27 – 28, 2016

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Questions?
Go to www.displayport.org

September 27 – 28, 2016

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