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Oliver_I_Sedlacek's avatar
Oliver_I_Sedlacek
Icon for Contributor rankContributor
1 year ago

Windows sees USB blaster but Quartus doesn't, why?

After using my USB blaster successfully with SignalTap to configure and debug my Cyclone4 part, SignalTap and the programming software aren't reliably seeing the USB blaster (by which I mean only 5% ...
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Farabi_Altera's avatar
Farabi_Altera
Icon for Regular Contributor rankRegular Contributor
1 year ago

Hi Oliver, from what I understand from your previous communication:


  1. Your USB Blaster can configure the device successfully.
  2. Your USB Blaster can detect the device in user mode.
  3. Your USB Blaster can connect the board and signaltap successfully.
  4. Only after some event, somehow the signaltap unable to connect.


from above problem statements, this is most probably on the signal integrity issue.


Trouble shooting steps:

  1. Could you please scope shot your TCK signal during the failure?


regards,

Farabi