Difference between revisions of "J-Link no USB enumeration"
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= Max. 10 J-Links enumerate = |
= Max. 10 J-Links enumerate = |
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When connecting multiple J-Links to USB 3.0 ports + hubs, it can happen that Windows only enumerates up to 10 J-Links and then throw enumeration errors. Depending on the USB setup, it may also be only 8 or 9 J-Links that are enumerated. |
When connecting multiple J-Links to USB 3.0 ports + hubs, it can happen that Windows only enumerates up to 10 J-Links and then throw enumeration errors. Depending on the USB setup, it may also be only 8 or 9 J-Links that are enumerated. |
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| − | '''This is not a problem in the J-Link USB driver'', but a limitation of the USB 3.0 controller, as the error message indicates: |
+ | '''This is not a problem in the J-Link USB driver''', but a limitation of the USB 3.0 controller, as the error message indicates: |
''' ERROR ''' |
''' ERROR ''' |
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Revision as of 15:43, 1 March 2018
Max. 10 J-Links enumerate
When connecting multiple J-Links to USB 3.0 ports + hubs, it can happen that Windows only enumerates up to 10 J-Links and then throw enumeration errors. Depending on the USB setup, it may also be only 8 or 9 J-Links that are enumerated. This is not a problem in the J-Link USB driver, but a limitation of the USB 3.0 controller, as the error message indicates:
ERROR
Sample setup with error
The following shows a sample setup which produces such an error
IMAGE
Sample setup workaround
The following shows a sample setup which workarounds the problem and let Windows enumerate all J-Links
IMAGE
