VirtualLink

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VirtualLink was a proposed USB-C Alternate Mode that was historically intended to allow the power, video, and data required to power virtual reality headsets to be delivered over a single USB-C cable instead of a set of three different cables as it was in older headsets. [1] [2] The standard was supported by Nvidia, AMD, HTC Vive, Oculus VR, Valve, and Microsoft. [3] The VirtualLink Consortium was chaired by Rambo Jacoby representing Nvidia.[ citation needed ].

Contents

According to its specifications, the VirtualLink cable consisted of:

The USB-C plug pinout specified:[ citation needed ]

A12A11A10A9A8A7A6A5A4A3A2A1
GNDDP[0]+DP[0]−VBUSCC1USBTX+USBTX−DP[AUX]+VBUSDP[2]−DP[2]+GND
GNDDP[1]+DP[1]−VBUSDP[AUX]−USBRX−USBRX+VCONNVBUSDP[3]−DP[3]+GND
B1B2B3B4B5B6B7B8B9B10B11B12

Unlike most alt-modes this remapped A7, A6, B6, B7 to carry a USB 3.0 signal, instead of the usual passive USB 2.0 signal. This means that one would not be able to extend the cable using a standard USB-C 3.0 cable, which has these pins mapped only for unshielded USB 2.0 signals. Also this required the VirtualLink port to also detect the correct orientation of the USB-C plug to ensure that the USB 3.0 TX and RX lanes are correctly connected.

In VirtualLink mode, there were six high-speed lanes active in the USB-C connector and cable: four lanes transmit four DisplayPort HBR 3 video streams from the PC to the headset while two lanes implement a bidirectional USB 3.1 Gen 2 channel between the PC and the headset. Unlike the classic DisplayPort USB-C alternate mode, VirtualLink has no USB 2.0 channels active, instead providing a higher speed USB 3.1 Gen 2 (SuperSpeed+) over the same A6, A7, B7, B6 pins. VirtualLink also required the PC to provide 15 to 27 watts of power. [3] [4] No information pertaining to VirtualLink alternate mode compatibility with USB4 (and so Thunderbolt 3 alternate mode) had been published.

To achieve six high-speed lanes over USB-C, VirtualLink required special cables that conformed to version 1.3 of the USB-C standard and used shielded differential pairs for both USB 2.0 pairs. [3] [5]

The available bandwidth was estimated to be equivalent to DisplayPort 1.4 (32.4 Gbit/s, up to 4K @ 120 Hz with 8 bpc color) for video and 10 Gbit/s of USB 3.1 Gen 2 data. [3]

Implementation in graphics cards and devices

As of March 2023 Sony PSVR2 has a single 5m USB Type-C cable connection to PS5 which seems to be working with Nvidia GeForce 20 series cards as well; because, unlike most ports, VirtualLink must also provide the required 12V via USB Power Delivery, an uncommon voltage, and they additionally support standard two-lane DisplayPort alt-mode, but the PSVR2 headset does not use the actual four-lane VirtualLink alt-mode, pinout or special shielded cable. [6] [7]

Nvidia GeForce 20 series cards, initially released in 2018, implemented a single VirtualLink port in all RTX Founders Edition (FE) cards (2060, 2070, 2080, 2080 Ti). [8] This port was also made available on Quadro RTX cards. [9]

As of Nvidia's GeForce 30 series cards announcement, all of Nvidia's new Founders Edition GPUs, alongside the partner boards announced so far, lacked a VirtualLink port due to its discontinuation. [10] By contrast, the AMD Radeon RX 6000 series, announced in October 2020, implemented a VirtualLink port for the first time. [11]

Discontinuation & abandonment

As of August 2020, the VirtualLink standard had failed to propagate into the virtual reality headset market. The Valve Index had initially developed a VirtualLink accessory, but it was canceled due to technical signaling and reliability issues. [12] By September of that year, it had been abandoned by its consortium, and the website now redirects to its Wikipedia page. [13]

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References

  1. ↑ "The next generation of VR headsets will connect over a single USB-C cable". The Verge. 17 July 2018.
  2. ↑ "VirtualLink: Everything USB Type-C Is Supposed To Be". Forbes. 2018-08-17.
  3. 1 2 3 4 Smith, Ryan (July 17, 2018). "VirtualLink USB-C Alt Mode Announced: Standardized Connector for VR Headsets". AnandTech. Retrieved 2018-08-21.
  4. ↑ "Virtual reality giants unveil VirtualLink as a standardized cable that may simplify VR rigs". PCWorld.
  5. ↑ "VirtualLink Removes Tangles from VR Goggles". EEJournal. 7 August 2018.
  6. ↑ "INFO: Hardware required for PSVR2 :: iVRy Driver for SteamVR PSVR2". steamcommunity.com. Retrieved 2024-01-18.
  7. ↑ iVRy_VR (2023-09-28). "Author of the PSVR2 PC driver on Reddit". r/PSVR. Retrieved 2024-01-18.
  8. ↑ Lang, Ben (20 August 2018). "GeForce RTX Cards Announced with VirtualLink VR Connector". Road to VR.
  9. ↑ "NVIDIA Unveils Quadro RTX, World's First Ray-Tracing GPU". NVIDIA.
  10. ↑ Smith, Ryan. "NVIDIA Announces the GeForce RTX 30 Series: Ampere For Gaming, Starting With RTX 3080 & RTX 3090". www.anandtech.com. Retrieved 2020-09-03.
  11. ↑ Lang, Ben (2020-10-28). "AMD Announces Radeon RX 6000-series GPUs with USB-C "for a modern VR experience"". Road to VR. Retrieved 2020-11-09.
  12. ↑ "Valve Cancels VirtualLink Adapter Accessory for Index, Cites Technical Issues & Laptop Adoption". RoadtoVR. 3 August 2019.
  13. ↑ Lang, Ben (2020-09-03). "The VirtualLink Single-cable VR Headset Connection Standard Has Been Abandoned". Road to VR. Retrieved 2021-12-11.
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