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Altera_Forum
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20 years ago

About a err message in NiosII

http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif hi all, When I applied ByteBlasterII to download my program into the dev board from Altera, something internal error i...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

I have to agree that the Altera USB Blaster seems to have problems with noise.

Even a new Rev.C USB Blaster with the yellow flast cable has been modified here to be a working blaster.

We have some strange behavioral with the JTAG connection. Sometimes SignalTap and Quartus prommer cannot connect (error33) but the ide can debug fine. we have to restart quartus to be able to connect to the target again.

What i finde very strange is this comment Jesse did. Short connections work (fpga update) but long time continously connect may fail. hmmm ... well ... yes ... i can update via command line but cannot do signaltap and ide debug .... is there some kind of static charging of the target & blaster system ?

I have also seen problems with GND loops. As the Blaster is not isolated, the GND of the PC will be connected over the usb, but the GND of the target could also be connected over a different path. In some cases there is a kind of GND-Loop that we had to break.

Regards.