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TUSB8020B: How it distributes the transportation? 5G split into two 2.5Gs ?

user6308844
Prodigy 10 points

Part Number: TUSB8020B

We are designing a new type of Network device, because some module need USB3.0 interface, but our CPU has only one port USB3.0, but our customer need a USB3.0 user interface.
So, we need a USB3.0 chip, TUSB8020B is fully meet our requirement. but we don't know how about its transfer efficiency, in my mind, this hub can split a 5Gbps USB3.0 into two USB3.0 port, each port should be 2.5Gbps, I don't think it is just a simple calculation, there should be some speed loss during this transformation. we want to know some detail about this. how about the transfer loss ? 5%, 10%......?

  • 0
    TI__Guru 60870 points

    Hello,

    USB traffic is all scheduled by the USB host, not the hub, but you won't see a 50% throughput drop using two ports.  Due to the protocol overhead in USB, you will see no impact on traffic USB Mass Storage devices (flash drive, memory media, etc), and may even see some improvement due to the buffers in the hub. There may be minimal impact on streaming isochronous traffic (cameras, video displays, etc) but should not be noticeable.  There is no formula we can suggest for this question since it depends on the type of traffic and how the host application has the USB traffic scheduled.

    Regards,

    JMMN