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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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