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Altera_Forum
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17 years ago

Cyclone III problem with USB blaster JTAG communication

Hi all I've spent the last week debugging the jtag connection between the fpga and the usb blaster.:mad: I finally found something that is wrong.:) In JTAG there are 4 signals.. The fi...
Altera_Forum's avatar
Altera_Forum
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17 years ago

As an additional remark, Terasic USB Blaster is using a different JTAG driver circuit. The said Errata Sheet doesn't necessarily apply to it.

As a general solution, some kind of protection should be provided for the JTAG port, e.g. schottky clamps to GND/VCCIO with small series resistors.