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  1. Masanori Ogino 𓀁 (omasanori@mstdn.maud.io)'s status on Wednesday, 04-May-2022 18:41:23 JST Masanori Ogino 𓀁 Masanori Ogino 𓀁

    USB4にもDisplayPortのプロトコル伝送方法が2通り定義されているという面白ポイントがあるので面白いですね(?)

    In conversation Wednesday, 04-May-2022 18:41:23 JST from mstdn.maud.io permalink
    • らりお・ザ・何らかの🈗然㊌ソムリエ repeated this.
    • Masanori Ogino 𓀁 (omasanori@mstdn.maud.io)'s status on Wednesday, 04-May-2022 18:41:23 JST Masanori Ogino 𓀁 Masanori Ogino 𓀁
      in reply to

      どういうことかというと、USB4はUSB 3.2とDisplayPort(とオプションとしてPCIe)を通すトンネルとして機能するように定義されていて、ホストとハブにはこの機構を使ったDP信号もUSB 3.2のDP Alt Modeを使ったDP信号も等しくサポートしなければならないと規定されているということです。

      In conversation Wednesday, 04-May-2022 18:41:23 JST permalink
      らりお・ザ・何らかの🈗然㊌ソムリエ repeated this.
    • Masanori Ogino 𓀁 (omasanori@mstdn.maud.io)'s status on Wednesday, 04-May-2022 18:44:46 JST Masanori Ogino 𓀁 Masanori Ogino 𓀁
      in reply to

      よくわかるUSB4

      Source: https://en.wikipedia.org/wiki/USB4

      In conversation Wednesday, 04-May-2022 18:44:46 JST permalink

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      1. Domain not in remote thumbnail source whitelist: upload.wikimedia.org
        USB4
        USB4 is a USB system specified in the USB4 specification which was released in version 1.0 on 29 August 2019 by USB Implementers Forum.In contrast to prior USB protocol standards, USB4 requires USB-C connectors, and for power delivery, it requires support of USB PD. In contrast to USB 3.2, it allows tunneling of DisplayPort and PCI Express. The architecture defines a method to share a single high-speed link with multiple end-device types dynamically that best serves the transfer of data by type and application. USB4 products must support 20 Gbit/s throughput and can support 40 Gbit/s throughput, but due to tunneling even nominal 20 Gbit/s can result in higher effective data rates in USB4, compared to USB 3.2, when sending mixed data. The USB4 specification is based on the Thunderbolt 3 protocol specification. Support of interoperability with Thunderbolt 3 products is optional for USB4 hosts and USB4 peripheral devices, and is required for USB4 hubs on their downward facing ports and for USB4-based docks on their downward and upward facing ports. On the other hand, support for USB4 is required in Thunderbolt 4. ...

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