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Zoltán Lehóczky

Nexys 4 DDR shows up with two COM ports

Question

We use Nexys 4 DDR boards for testing our platform. While with most of the Windows host PCs there are no issues, with one of our clients' when the board is plugged in (using the supplied micro USB cable) it shows up as two COM ports under Windows's Device Manager. We suspect this is behind that we can't properly run Xilinx SDK programs on the board, the debugger looses the connection.

  1. Is it normal that the board shows up as two COM ports? (When the board is de-attached the ports disappear, so both are surely the single board.)
  2. If yes, can this cause issues? If now, how can we begin to troubleshoot the problem, what can possible be behind it?

Thank you in advance!

Edited by Zoltán Lehóczky

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7 answers to this question

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Thank you @D@n. Do you mean the "Cable Drivers" you can select to install when setting up Vivado? We haven't installed anything else apart from what ships with VIvado on the machines where it's working (except copying board support files).

VivadoInstallationItems.png

Edited by Zoltán Lehóczky

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It tuns out the problem wasn't with the drivers (though those were missing too), but rather that not a Nexys 4 DDR, but a Nexys 4 was connected... Naturally the SDK program couldn't start, lacking the DDR RAM it was configured to use.

Thanks for your help @D@n!

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@Zoltán Lehóczky,

I excited for you that you got things working!

Your project looks like a lot of fun.  Can I invite you to share your work in the Project Vault once the project completes?

Either way, thank you for sharing what finally worked.  I'm sure many others will find this answer record useful,

Dan

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