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  • emUSB-Host
  • Performance

    Performance

    The following values have been tested using the CDC-ACM protocol.

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    SEGGER emUSB-Host

    System with Synopsys (USB High-Speed) Controller *

    Measurements

    Description

    Speed
    Write speed38.4 MB/s
    Read speed39.0 MB/s

    System Configuration

    DetailDescription
    CPUCortex-M7 running with 180 MHz
    Test DeviceemPower board running emUSB-Device
    Test ProtocolCDC-ACM protocol
    Transfer Block Size200 MB

    System with EHCI (USB High-Speed) Controller *

    Measurements

    DescriptionSpeed
    Write speed30.9 MB/s
    Read speed36.0 MB/s

    System Configuration

    DetailDescription
    CPUCortex-M4 running with 180 MHz
    Test DeviceemPower board running emUSB-Device
    Test ProtocolCDC-ACM protocol
    Transfer Block Size200 MB

    System with OHCI (USB Full-Speed) Controller *

    Measurements

    DescriptionSpeed
    Write speed800 KByte/sec
    Read speed800 KByte/sec

    System Configuration

    DetailDescription
    CPUCortex-A5 running with 498 MHz
    Test DeviceemPower board running emUSB-Device
    Test ProtocolCDC-ACM protocol
    Transfer Block Size5 MB

    * The performance of a USB communication depends on a multitude of factors: hubs, low transfer sizes can reduce the performance. Most importantly the device needs to be able to achieve the same speed as the host for good performance values.

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