Can't select USB-Blaster in SignalTap

--- Quote Start ---

Hey there,

i'm using Quartus II 64bit 12.1 to program a Cyclone IV. Everything works fine, except sometimes i can't use SignalTap. I've already googled some time and used the forum search. Now here's my problem:

If i want to use SignalTap sometimes it works, sometimes not. Problem is: i can't select the proper USB-Blaster in case of some other devices connected to USB, using the same FTDI (communication to a DSP). So this means, in Quartus itself i'm using USB-Blaster[USB-0] which works fine, then after switching to SignalTap i can't select USB-Blaster[USB-0]. The only possible hardware to select is - maybe - USB-Blaster[USB-2] which is definetly not the Blaster I used to programm the Cyclone. I'm sure that it's a kind of driver-conflict (i'm sure about that, because if I use a second PC for Quartus and SignalTap everything works fine), but i need to use all the USB-devices the same time at one computer.

So has anyone an idea how to deal with this problem?! (Sometimes the SignalTap connection works.. but i can't say why:D )

Thanks!

--- Quote End ---

Boy, this sounds familiar. I know I've encountered this problem before. When you use SignalTap do you by any chance ever have the Quartus II programmer window open as well? If I remember correctly, the programmer and SignalTap cannot share a USB Blaster. You have to close one program before opening the other. If that's what's going on, remember that you can download a .sof file to the target FPGA within SignalTap. You don't need the programmer to do that.

--- Quote Start ---

One of the other FTDIs is mistaken as USB-Blaster. How can i run jtagconfig?

--- Quote End ---

If your PATH is set up correctly you should be able to just type "jtagconfig" in your shell/command window.

--- Quote Start ---

Boy, this sounds familiar. I know I've encountered this problem before. When you use SignalTap do you by any chance ever have the Quartus II programmer window open as well? If I remember correctly, the programmer and SignalTap cannot share a USB Blaster. You have to close one program before opening the other. If that's what's going on, remember that you can download a .sof file to the target FPGA within SignalTap. You don't need the programmer to do that.

--- Quote End ---

This could be the problem. Usually i programmed the device using the Quartus II programmer (but i closed it afterwards..) and then tried to connect via SignalTap. I'll keep an eye on it. Thanks!

--- Quote Start ---

If your PATH is set up correctly you should be able to just type "jtagconfig" in your shell/command window.

--- Quote End ---

Ok, i used jtagconfig, but there was no other device detected except the USB_Blaster. I'll have a look on jtagconfig, the next time my problem appers. Thanks!