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Ad13's avatar
Ad13
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5 years ago

Cyclone 10GX VREF pin

I have a custom board using Cyclone 10GX085YU484 and I cannot program the device and it does not appear on the JTAG chain. I have left the VREF pins floating (VREF pins (T7, T13, J15 and F12) ). The ...
Ad13's avatar
Ad13
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5 years ago

Hi, yes all connected to Quartus and the Quartus programmer.

I have tried multiple programmers(download cables), including the official Altera USB Blaster 2. I am able to program other devices from Quartus with the same set up and download cable fine.

Would floating VREF pins cause this problem?

Thanks.

L982123's avatar
L982123
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4 years ago

Hi, were the floating VREF pins causing your problem? I am seeing the same issue and VREFs also floating.