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USB 4.0 "USB4" Specification Published

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  • #51
    Does it actually say anywhere that they're dropping USB 1.0 support in the sense of incompatibility with USB 1.0 peripherals? It seems very unlikely since it's a necessary subset of USB 2.0. The USB 2.0 high speed connection process uses low/full speed signaling. I'm pretty sure the press release is just using USB 2.0 as a shorthand for old fashioned 4 wire USB.
    Last edited by patstew; 09-06-2019, 08:31 PM.

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    • #52
      Originally posted by patstew View Post
      Does it actually say anywhere that they're dropping USB 1.0 support in the sense of incompatibility with USB 1.0 peripherals? It seems very unlikely since it's a necessary subset of USB 2.0. The USB 2.0 high speed connection process uses low/full speed signaling. I'm pretty sure the press release is just using USB 2.0 as a shorthand for old fashioned 4 wire USB.
      Excellent question. I would also like to know the answer.
      Press releases are full of bullshit, like always, that's why I avoid reading them.

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      • #53
        The rage is funny as often on this forum.
        It's not the first time we have this USB 1.x "issue", USB Type C commits the same sin of not mentioning because it's old fashioned or something so I know how annoying this is .
        Most people have no idea if their stuff is 1.1 or 2.0.

        If you scourge the web you can eventually find out that 1.x is supported on Type C 3.0 (afaik).
        Leaving it out would be completely stupid, e.g. you have a new $1000 laptop with only two ports and plugging in a mouse wouldn't fucking even work. This is unthinkable.

        Many devices are USB 1.1, and probably Low-Speed for some or many of them
        - bar code scanner (most likely to be a very simple device that registers as a keyboard)
        - keyboard
        - dumb phone
        - probably anything that uses a USB to RS232 converter (any sort of random peripheral or device or SBC)
        - peripherals for a cash register, themselves mostly Windows or Linux x86 PCs apparently
        like the receipts printer. these used to be serial devices and might be internally USB to RS232
        - gamepad/joystick
        - audio? consider that people are using bluetooth for this. USB 1.1 seems much better than bluetooth.

        The issue could be though : are your 1GB/s SSDs slowed by the slow peripherals when sharing the port (avoid computers with only one port then)
        I bet they didn't fix this, unless USB2 and USB3 can be used simultaneously and separately.. and a vendor would dare put a USB 2.0 port on a break out box.
        In theory, a Thunderbolt dock/dongle/box can carry multiple USB controllers.

        Well, get a laptop with at least two USB4 and one USB-A or two USB-A and one USB4. That'll be cheaper that one with two Thunderbolt. Have a HDMI 2.x and an RJ45 (2.5Gbps?) and the laptop will be cheaper still (and can be upgraded to 4TB SSD, 64GB RAM, until bigger SSD capacities are available) because the cheaper they are, the more they do!
        Last edited by grok; 09-09-2019, 05:34 AM.

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        • #54
          Originally posted by ThoreauHD View Post
          So.. what's changed between this and usb 3.2 protocol? This shit's really confusing. Asrock X570's have thunderbolt 3/usb 3.2 already. What's the 4 do?
          So the 4 seems to bring a 40 Gbps mode but that is pretty useless as even 10 Gbps peripherals are rare (hosts, even)

          More interesting would be USB speed / Displayport speed combinations. If it really is "Thunderbolt without PCIe" then that might be good for that specifically (I seemed to understand that USB C alternate mode gives you USB 2.0 data while using the high bandwidth pins for the audio/video)
          Quote of the small article : "USB 4.0 doubles the maximum aggregate bandwidth and allows for multiple simultaneous data and display protocols."

          So quite a big deal if using a tablet-like or ultra thin, you can get a goddamn dongle for cheaper, have it actually work and on non-Intel too (Intel will boast about their CPU/chipset lanes on new platform). If cheaper low power 20Gbps is an option that's useful too.

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          • #55
            Originally posted by grok View Post

            So the 4 seems to bring a 40 Gbps mode but that is pretty useless as even 10 Gbps peripherals are rare (hosts, even)

            More interesting would be USB speed / Displayport speed combinations. If it really is "Thunderbolt without PCIe" then that might be good for that specifically (I seemed to understand that USB C alternate mode gives you USB 2.0 data while using the high bandwidth pins for the audio/video)
            Quote of the small article : "USB 4.0 doubles the maximum aggregate bandwidth and allows for multiple simultaneous data and display protocols."

            So quite a big deal if using a tablet-like or ultra thin, you can get a goddamn dongle for cheaper, have it actually work and on non-Intel too (Intel will boast about their CPU/chipset lanes on new platform). If cheaper low power 20Gbps is an option that's useful too.
            From a brief look at the spec, it basically is thunderbolt 3, to the extent that it specifies a couple of minor extensions on the host side that make it fully interoperable. It includes the capability to tunnel PCIe.

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