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Honored Contributor
Honored ContributorPossible causes of dead cyclone IV on custom board
Hello, i designed and soldered my first fpga board using cyclone IV in the 144 eqfp package. First of all, i made following mistakes: I am using 3.3V VCCIO for all IO banks. I misread the han...
Altera_ForumHonored Contributor
Honored Contributor1) Yes, you are right. I connected pull-ups to 3.3V. But the voltage reference for Terasix blaster was connected correctly to 2.5V. I do not know, what i was thinking.
I have seen activity on both TDI and TMS. That is how i came to the conclusion, that JTAG on device might be fried. I expected to see some data on TDO, when TDI and TMS are active. I am glad to hear, that the TCK behaviour is normal. I was little worried, because i do not have acces to any evaluation board to have look at its TCK and the waveforms i found on the internet were looking pretty uniform. One more thing comes to the mind: The TCK signal is not 2.5V as i would expect, but only 1.8V - 2V. I am not sure what voltage it exactly was, since i do not have access to my scope and the device at the moment. Is this normal behaviour? Thank You for pointing me towards another thread! Arnost
