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USB 4.0 "USB4" Specification Published

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  • USB 4.0 "USB4" Specification Published

    Phoronix: USB 4.0 "USB4" Specification Published

    As expected after Intel provided Thunderbolt 3 to the USB Promoter Group royalty-free earlier this year, the USB 4.0 "USB4" specification was published today and indeed based on the Thunderbolt protocol specification...

    http://www.phoronix.com/scan.php?pag...tion-Published

  • #2
    Soon to be renamed Ultraspeed USB 4.2.0 Gen 2.2x4 40Gbps?

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    • #3
      So does this support PCIe or not? I think this was one major feature where it still wasn't clear which direction USB would take. I of course hope it does retain PCIe support from Thunderbolt! Everything else sounds great - especially the flexible bandwidth allocation.

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      • #4
        Meh, again usb type c. Its adaptation strategy is such a nightmare.

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        • #5
          I wonder why USB never made a color code specification for cables / ports. IE, yellow ring for power only, blue for serial only, green for display, red for parallel / full spec. For the power spec orange could be "fast" charging capable up to the rated limit whereas yellow would only be up to the usual 5v.

          As it is you are buying C cables that may or may not support dozens of features being plugged into ports that could do anything.

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          • #6
            USB4 is backwards compatible with USB 3.2, USB 2.0, and Thunderbolt 3.
            So it is NOT backwards compatible with USB 1.0/1.1? That's a pretty glaring omission. There are tons of older HID devices, printers, label printers, and other devices that don't need much bandwidth and typically have a long service life. People gonna be pissed when they find this out the hard way.

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            • #7
              Originally posted by AsuMagic View Post
              Soon to be renamed Ultraspeed USB 4.2.0 Gen 2.2x4 40Gbps?
              Yes but only if you use the proper certified cables. They look the same as non-certified cables, but don't worry, nobody will be confused by this. And as we all know, the Chinese never ever produce fake products with fake certifications, so you can be certain that any cable you buy online for $0.10 with free shipping is going to get 40 Gbps, guaranteed.

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              • #8
                Originally posted by zanny View Post
                I wonder why USB never made a color code specification for cables / ports. IE, yellow ring for power only, blue for serial only, green for display, red for parallel / full spec. For the power spec orange could be "fast" charging capable up to the rated limit whereas yellow would only be up to the usual 5v.

                As it is you are buying C cables that may or may not support dozens of features being plugged into ports that could do anything.
                Red, orange, green, purple, blue, and yellow.
                New brighter colors for USB cables!

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                • #9
                  Originally posted by brent View Post
                  So does this support PCIe or not? I think this was one major feature where it still wasn't clear which direction USB would take. I of course hope it does retain PCIe support from Thunderbolt! Everything else sounds great - especially the flexible bandwidth allocation.
                  Protocol on top of protocol...

                  We already have the following mess:
                  - Super-Slow USB (1.1 low-speed)
                  - Slow USB (1.1 full-speed)
                  - High-Speed USB (2.0)
                  - SuperSpeed USB (3.0)
                  - USB 3.1 Gen1 which is basically SuperSpeed
                  - USB 3.1 Gen2 which is SuperSpeed x2
                  - USB-C which does USB
                  - USB-C which does DisplayPort
                  ​​​​​- USB-C which does Power
                  - Thunderbolt 3 that looks like USB-C and does PCIe
                  - USB 3.2 Gen1x1 which is the same old boring SuperSpeed
                  - USB 3.2 Gen1x2, more like Universal Parallel Bus
                  - USB 3.2 Gen2x1 which is 3.1 Gen2
                  - USB 3.2 Gen2x2 which is the only improvement over 3.1
                  - USB that transmits power
                  *Cables*
                  - USB-A which is your typical USB port but the cable is A only in one side unless it's one of those weird cables
                  - USB-B which is used on large hardware slaves (printers, capture cards, MIDI controllers, etc.)
                  - miniUSB-A, which nobody uses
                  - miniUSB-B, which is used on smaller devices
                  - microUSB-A, which nobody uses
                  - microUSB-B, which is used on phones and some more recent devices
                  - USB-B 3.0, which is like a USB-B cable but a little taller
                  - microUSB-B 3.0. When I first saw it I thought it was a proprietary connector, but no, it isn't. It looks weird.
                  - Cables that work very well but are expensive
                  - Cables that fail after a few days of use
                  - Cables that fail every time the freezer turns on
                  - Cables that claim doing 20Gbps but actually only do less

                  And now what?
                  - USB that looks like USB but actually does PCIe?!?!
                  - USB 4.0 that does Thunderbolt 3?
                  - USB 4.0 Gen2x2²x4sin(π)?
                  - AsuMagic's proposal?
                  Last edited by tildearrow; 09-03-2019, 02:48 PM.

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                  • #10
                    Originally posted by brent View Post
                    So does this support PCIe or not? I think this was one major feature where it still wasn't clear which direction USB would take. I of course hope it does retain PCIe support from Thunderbolt! Everything else sounds great - especially the flexible bandwidth allocation.
                    I hope it doesn't. That's a misfeature.

                    But it is backwards compatible with TB3, so it probably supersets TB3 and does

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