USB 4.0

The USB Implementers Forum has announced the publication of USB4! The specification is available to download now as part of the document library of

USB Implementers Forum Announces the Publication of Its Thunderbolt 3-Based USB4 Standard article tells that USB 4 offers up to 40Gb/s throughput, PCI Express, and DisplayPort connectivity — plus compatibility back to USB 2.0.

USB4 is built around Intel’s Thunderbolt connectivity standard, which incorporates PCI Express and DisplayPort plus power delivery connectivity in a single cable.

USB4 is promised to be be fully backwards compatible with previous USB devices from the current top-end USB 3.2 Gen 2×2 standard down to USB 2.0 (though not now very rarely used USB 1.0). USB4 will be compatible with existing USB Type-C cables.


  1. Tomi Engdahl says:

    Thunderbolt 4 arrives in 2020, but USB will remain the king of PC ports

    USB 4 will transfer data just as swiftly, but Intel promises other innovations for Thunderbolt.

  2. Tomi Engdahl says:

    USB4™ Specification

    NOTE: Adopters may only use this USB specification to implement USB or third party
    functionality as expressly described in this Specification; all other uses are prohibited.

    LIMITED COPYRIGHT LICENSE: The Promoters grant a conditional copyright license under the
    copyrights embodied in this USB Specification to use and reproduce the Specification for the
    sole purpose of, and solely to the extent necessary for, evaluating whether to implement
    the Specification in products that would comply with the specification.

  3. Tomi Engdahl says:

    Tx/Rx test software tackles USB4

    QPHY-USB4-TX-RX electrical transmitter and receiver compliance test software from Teledyne LeCroy automates USB4 physical-layer testing. The software teams with the company’s LabMaster 10 Zi-A and WaveMaster/SDA 8 Zi oscilloscopes, as well as Anritsu’s SQA-R MP1900 bit error rate tester (BERT), to form a complete USB4 electrical test system.

  4. Tomi Engdahl says:

    DisplayPort Alt Mode 2.0 Spec Released: Defining Alt Mode for USB4
    by Ryan Smith on April 29, 2020 3:00 PM EST

    As the tech industry gears up for the launch of the new USB4 standard, a few more parts first need to fall into place. Along with the core specification itself, there is the matter of alternate modes, which add further functionality to USB Type-C host ports by allowing the data pins to be used to carry other types of signals. Keeping pace with the updates to USB4, some of the alt modes are being updated as well, and this process is starting with the granddaddy of them all: DisplayPort Alt Mode.

    Now, as USB4 prepares to enter service, DisplayPort Alt Mode is being updated as well. One of the many big changes in the USB4 spec is that DisplayPort is a first-class citizen, with USB4 able to encapsulate DisplayPort video data like Thunderbolt 3 already does. So in order to keep pace with USB4 – where things are a bit more rigorous and well-defined this time around – VESA has needed to tighten the Alt Mode standard to match, as well as to update the specification to incorporate DisplayPort 2.0 and its UHBR signaling standards. The end product, fittingly enough, will be called DisplayPort Alt Mode 2.0.

  5. Tomi Engdahl says:

    Ensi vuodesta lähtien uusissa laitteissa on yksi liitäntä

    PC-tekniikassa on haettu yhtä universaalia liitäntää vuosien, jopa vuosikymmenten ajan. Ensi vuodesta lähtien voidaan vihdoin sanoa, että tavoite on saavutettu. USB4 tulee valtaamaan markkinat täysin.

    USB4-liitäntä perustuu käytännössä Intelin Thunderbolt-protokollaan. Fyysisesti kyse on USBC-liittimestä ja koska sen läpi on tarkoitus saada kulkemaan kaikki liitäntöjen edellyttämä liikenne datasta eri protokollilla latausvirtaan, on liittimen nastoitus erittäin tärkeässä roolissa.

    Tämä näkyy myös uudessa VESA-näyttöorganisaation julkistamassa DisplayPort-liitännän Alt Mode 2 -määrityksessä. Alt Mode viittaa menetelmään, jolla DisplayPort-signaali saadaan siirrettyä USB-liitännän läpi. Ensimmäinen DP Alt Mode -standardi esiteltiin jo 2014 ja nyt VESA on esitellyt Alt Mode -menetelmän myös tuoreelle DisplayPort 2.0 -liitännälle.

    USB4-liitännässä DisplayPort-dataa voidaan siirtää jopa 80 gigabittiä videodataa, kun käytössä ovat kaikki neljä linjaa. Toinen tapa on siirtää DP-kuvaa 40 gigabitin nopeudella ja jättää kaksi johdinta USB Superspeed -datansiirrolle.

    USB4-liitäntöjen arvellaan ilmestyvän laitteisiin ensi vuonna.

  6. Tomi Engdahl says:

    Synopsys launched its USB4 IP and tools, already with a successful tapeout of a USB4 PHY test chip on 5nm advanced FinFET process. The Designware USB4 IP’s throughput is up to 20 or 40 Gbps, which Synopsys says is the bandwidth needed for high-performance edge AI, storage, PC, and tablet SoC designs. Also, Samsung Foundry certified Synopsys’ Design Compiler NXT for 5/4nm finFET process technologies.

  7. Tomi Engdahl says:

    USB4: User Expectations Drive Design Complexity
    A breakdown of what USB4 can do and why it is so complex.

    This white paper outlines the capabilities of USB4 Hosts, Hubs, Docks, and Devices with an emphasis on how end-user expectations drive the complexity of USB4 products. USB4 is the most complex USB specification so far and requires designers to understand the USB4, USB 3.2, USB 2.0, USB Type-C, and the USB Power Delivery specifications. Designers must also understand PCIe and DisplayPort specifications, as well as High Definition Content Protection (HDCP) for many USB4 designs. This is needed to design USB4 products that meet user expectations: “It’s USB — it just works!”

  8. Tomi Engdahl says:

    Intel could kill off traditional USB ports with USB 4 laptops

    New documentation that supposedly sheds light on Intel’s USB 4 plans, with the USB 4.0 host controller coming in three versions: 0x9A1B, 0x9A1D, and 0x9A13, and it suggests that it will not be compatible with the larger Type A USB ports.

    According to the leak, which was shared on Twitter by @_rogame, a well known leaker, an internal document mentions how USB 4.0 comes with USB 3.2 support, yet does not mention USB 2.0 or USB 1.1 support.

    Although the number and type of ports is down to manufacturers, it could mean most modern laptops will no longer come with those older ports. If you have peripherals that use those ports, you’re therefore likely to need an adaptor.

    While the loss of Type A ports will be annoying for people who use legacy peripherals, many laptops don’t come with them anyway – MacBooks ditched them years ago.

    Also, most new peripherals come with the Type-C connection, and that will work with USB 4.

  9. Tomi Engdahl says:

    2021 will see a big wave of USB4 devices. Here’s what will be different about them:

    What Is USB4? How the New Interface Boosts Speeds, Supports Screens, and More

    USB4, the next generation of USB, is in equal parts a reboot, a speedup, and a simplification of the everywhere-you-look connection spec. Here’s what you need to know.

    Just call it USB4 on the floor: 2021 will see a big wave of devices featuring a new USB standard that goes beyond the usual speed boosts. USB4, the newest version of USB, nixes the space (it’s not “USB 4″—more on that in a moment) and papers over some of the wooly confusion that is USB 3. Plus, beyond the new speeds, it adds new nuances to device compatibility and charging over the port.

    Where does USB4 come from? In part, from earlier USB specs; in part, from another interface. USB4 leverages the Thunderbolt 3 protocol to deliver speeds up to twice as fast as the USB version it replaces. In addition to its greater bandwidth, USB4 can more deftly shuttle and prioritize file and video data through its pipes than previous USB iterations could. And USB4 offers backward compatibility with all the old PC-connectivity crowd on its physical ports: Thunderbolt 3, USB 3.2, and USB 2.0 devices.

  10. Tomi Engdahl says:

    What Is USB-C? An Explainer
    With so many Macs and Windows laptops now featuring the interface, it’s clear that the USB Type-C connector is here to stay. Here’s why that’s a good thing—and how to understand both its subtleties and where it’s headed.

  11. Tomi Engdahl says:

    USB on valtava menestys. Se on kaikkialla autoista tietokoneisiin, älypuhelimista oheislaitteisiin. Nyt näyttää siltä, että maceista ja kalliimmista läppäreistä tuttu Thunderbolt-väylä saattaisi haastaa USB:n. Tähän alkaa olla hyvät perusteet.

    Esimerkiksi Thunderbolt-kehitystä Intelillä johtava Jaon Ziller on sanonut, että ensi vuodesta lähtien Thunderbolt voisi olla mukana joka toisessa uudessa tietokoneessa.

    Thunderbolt on tähän asti ollut ylivoimaisen nopea. Data siirtyy 40 gigabitin sekuntivauhdilla. USB kiihtyy samaan nopeuteen vasta USB4-laitteiden myötä, mutta niitä ei oikeastaan vielä ole. Thunderboltia ollaan kuitenkin kehittämässä nopeammaksi, joten nopeusero mahdollisesti säilyy.

    Thunderboltin etuna on se, että sen yli voidaan ajaa useita eri protokollia. Liitännän yli siirtyy HDMI-data, Displayport-kuvasignaali, Ethernet-yhteys ja virta. Tämä mahdollistaa erittäin integroidut laiteratkaisut. Periaatteessa yksi Thunderbolt-portti riittäisi, jos siihen liittäisi yhden monikäyttöisen hubin.


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