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Altera_Forum
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15 years ago

Error: Can't access JTAG chain

When i try to program the FPGA cyclone III i get this error : error: can't access jtag chain error: operation failed. I am using a FPGA cyclone III .I would be able to program it a few months...
Altera_Forum's avatar
Altera_Forum
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14 years ago

Zhang, in Quartus 9.1 the JTAG debugger is not under Tools; it is under Processing->JTAG Chain Debugger. This is the menu of the Programmer tool, not the main Quartus window. Hopefully it is there in 9.0 as well.

I am having the same problem with a custom PCB that I designed and built using a USB Blaster for JTAG communications with a Cyclone III. The design is based on a known-good design, but I have not been able to establish communications with the FPGA yet. Sadly there are many MANY things that can go wrong with such a complex system, resulting in loss of communications.