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DisplayPort

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DisplayPort
Type Digital audio/video connector
Production history
Designer VESA
Designed 2006-2007
Produced 2008 expected
General specifications
Hot pluggable Yes
External Yes
Audio signal Optional, maximum 8-channel uncompressed 192 kHz, 24-bit audio, 6.144 Mbit/s bitrate
Video signal Optional, maximum 2560x1600 resolution
Cable maximum length 15 metres (video transmission of resolution 1080p at 24bpp, 50/60 Hz), 3 metres for full bandwidth transmission, made of materials of either copper or optical fibre
Pins 20 (external connectors)/32 (internal connector for notebooks)
Electrical
Signal +3.3V
Max. voltage 16.0 V
Max. current 500mA
Data
Data signal Yes
Bitrate 1.62 or 2.7 Gbit/s per lane (total 6.48 Gbit/s or 10.8 Gbit/s) plus 1 Mbit/s for AUX CH (for additional data)
Protocol mini-packet
Pinout
File:DisplayPort source-side connector pinout.png
External connector (source-side) on PCB
Pin 1 ML_Lane 0(p) ‘True’ Signal for Lane 0
Pin 2 GND Ground
Pin 3 ML_Lane 0(n) ‘Complement’ Signal for Lane 0
Pin 4 ML_Lane 1(p) ‘True’ Signal for Lane 1
Pin 5 GND Ground
Pin 6 ML_Lane 1(n) ‘Complement’ Signal for Lane 1
Pin 7 ML_Lane 2(p) ‘True’ Signal for Lane 2
Pin 8 GND Ground
Pin 9 ML_Lane 2(n) ‘Complement’ Signal for Lane 2
Pin 10 ML_Lane 3(p) ‘True’ Signal for Lane 3
Pin 11 GND Ground
Pin 12 ML_Lane 3(n) ‘Complement’ Signal for Lane 3
Pin 13 GND Ground
Pin 14 GND Ground
Pin 15 AUX_CH(p) ‘True’ Signal for Auxiliary Channel
Pin 16 GND Ground
Pin 17 AUX_CH(n) ‘Complement’ Signal for Auxiliary Channel
Pin 18 Hot Plug Hot Plug Detect
Pin 19 DP_PWR Return Connector Power return
Pin 20 DP_PWR Power for connector

1) Pins 13 and 14 may either be directly connected to ground or connected to ground through a pulldown device.

2) This is the pinout for source-side connector, the sink-side connector pinout will have lanes 0-3 reversed in order, i.e. lane 3 will be on pin 1 and 3 while lane 0 will be on pin 10 and 12.

DisplayPort is a new digital display interface standard (approved May 2006, current version 1.1 approved on April 2 2007) put forth by the Video Electronics Standards Association (VESA). It defines a new license-free, royalty-free, state-of-the-art digital audio/video interconnect, intended to be used primarily between a computer and its display monitor, or a computer and a home-theater system.

Overview

The DisplayPort connector supports 1 to 4 data pairs in a Main Link that also carries audio and clock signals, each with a transfer rate of 1.62 or 2.7 gigabits per second (Gbit/s). The Video signal path supports 6 to 16 bits per color channel. A bi-directional auxiliary channel runs at a constant 1 megabit per second, and serves as Main Link management and device control using VESA EDID and VESA MCCS standards. The Video signal is not compatible with DVI or HDMI, but the specification will allow pass-through of these signals.

DisplayPort supports a maximum of 10.8 Gbit/s data rate and WQXGA (2560×1600) resolution over a 3 meter cable.[1]

DisplayPort includes optional DPCP (DisplayPort Content Protection) copy-protection from AMD, which uses 128-bit AES encryption, with modern cryptography ciphers. It also features full authentication and session key establishment (each encryption session is independent). There is an independent revocation system. This portion of the standard is licensed separately. It also adds support for verifying the proximity of the receiver and transmitter, a technique intended to ensure users are not bypassing content protection system to send data out to distant, unauthorized users.

DisplayPort is a competitor to the HDMI connector (with HDCP copy-protection), the de facto digital connection for high-definition consumer electronics devices. Another competitor is Unified Display Interface,[2] a low cost compatible alternative to HDMI and DVI. However, the main supporter of UDI, Intel, has stopped the development of the technology and now supports DisplayPort.

Newly featured in version 1.1 is the support of HDCP content protection and support for fiber optic cables as an alternative to copper, allowing a much longer reach between source and display without image degradation.[3] Revision 2.0 is planned for later release.

Before being acquired by AMD, one of the supporters, ATI reported that they were expecting DisplayPort products in early 2007. The AMD/ATI merger completed July 2006 might have postponed the availability of DisplayPort products somewhat, but it seems as though AMD has decided to use DisplayPort as the standard port for its Fusion processor platform, and upcoming mobile platforms after 2008 as AMD announced that they will introduce their first DisplayPort products in late 2007 as a part of their forthcoming platforms for mainstream on December 15 2006.

On July 25, 2007, at AMD's Technology Analyst Day 2007, AMD renewed their commitment to supporting DisplayPort with upcoming RS780 chipset and future RV670 graphics cards.

Genesis Microchip also announced DisplayPort products to be available in 2007[4], as did Samsung[5]. A concept monitor by Dell implementing DisplayPort was demonstrated early May 2007.[6]

On December 19th, 2007 DaileyTech announced the Dell New Zealand starting offering a 30-inch monitor with the DisplayPort [7]

Supporters

There are several companies stated to support DisplayPort: Luxtera, AMD, Intel, Dell, Genesis Microchip, Hewlett-Packard, Lenovo, Hosiden Corporation, Molex, NVIDIA, Philips, Samsung, Parade Technologies, Analogix, Quantum Data, and Tyco Electronics.

Compliance testing

VESA has selected four internationally-known organizations – Allion Test Lab, Inc., Contech Research, ETC, and NTS for compliance testing with emerging DisplayPort standard. In September, 2007, the version 1.0 of the standards for PHY layer and link layer compliance testing has been released and hosted on VESA website for public download.

Technical specifications

  • 10.2 Gbit/s forward link channel supports high resolution monitors, 2560×1600, with single cable.†
  • 8B/10B data transmission
  • Open and extensible standard to help with broad adoption.
  • Supports color depth of 6, 8, 10, 12 and 16 bits per component.
  • Full bandwidth transmission for 3 meter cable.
  • Reduced bandwidth transmission, 1080p, for 15 meter cable.
  • DisplayPort connector assists in blind connection by just feeling.
  • 128-bit AES DisplayPort Content Protection (DPCP) support, and support for 40-bit High-bandwidth Digital Content Protection (HDCP) from version 1.1 onwards.
  • Supports internal and external connections so that one standard can be used by computer makers reducing costs. [1]

The specifications can be downloaded at vesa.org with free registration.

† 70fps × 24bpp × 2560 × 1600 = 6.9 Gbit/s, not taking into account blanking.

See also

References

  1. ^ Tuan Nguyen (2007-02-19). "DisplayPort to support HDCP, too". Engadget. Retrieved 2007-01-03. {{cite web}}: Check date values in: |date= (help)
  2. ^ Tuan Nguyen (2007-02-19). "The Future of HDMI". DailyTech. Retrieved 2007-07-16. {{cite web}}: Check date values in: |date= (help)
  3. ^ "VESA Enables Optical Video Interconnect in DisplayPort Standard (Press Release)". Luxtera Inc. 2007-04-17. Retrieved 2007-07-16. {{cite web}}: Check date values in: |date= (help)
  4. ^ "Genesis Microchip (GNSS) Q4 2006 Earnings Conference Call". Seeking Alpha. 2006-05-02. Retrieved 2007-07-16. {{cite web}}: Check date values in: |date= (help)
  5. ^ "Samsung touts development of first DisplayPort desktop LCD". TG Daily. 2006-07-25. Retrieved 2007-07-25. {{cite web}}: Check date values in: |date= (help)
  6. ^ "Dell Shows Off Super-Slim Display Port LCD Monitor". Gearlog.com. 2007-05-17. Retrieved 2007-07-16. {{cite web}}: Check date values in: |date= (help)
  7. ^ "Dell 30-inch 3008WFP LCD Touts DisplayPort". DaileyTech.com. 2007-12-19. {{cite web}}: |access-date= requires |url= (help); Check date values in: |date= (help); Missing or empty |url= (help); Text "http://www.dailytech.com/Dell+30inch+3008WFP+LCD+Touts+DisplayPort+/article10089.htm" ignored (help)
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