Changes between Version 20 and Version 21 of USB


Ignore:
Timestamp:
02/22/2023 11:51:02 PM (21 months ago)
Author:
Ryan Erbstoesser
Comment:

add usb speed statement

Legend:

Unmodified
Added
Removed
Modified

  • USB

    v20 v21  
    2424[=#speed]
    2525== USB Speeds ==
    26 The following is a set of supported speeds per USB specification:
     26The following is a set of supported theoretical speeds per USB specification:
    2727 * **USB !LowSpeed** (1.5mbps) (USB 1.0 UHCI/OHCI) - Only supports Control and Interrupt transfer types
    2828 * **USB !FullSpeed** (12mbps) (USB 1.0 UHCI/OHCI)
    2929 * **USB !HighSpeed** (480mbps) (USB 2.0 EHCI)
    3030 * **USB !SuperSpeed** (5000mbps) (USB 3.0 XHCI)
     31
     32Note that the USB software stack and chipset vendor host controller implementation have overhead that reduce actual USB performance from theoretical bandwidth. Embedded SoC's typically do not prioritize USB performance like modern desktop computers. Additionally there may be Linux build-time and run-time tuning that can be done that affect performance.
    3133
    3234