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Altera_Forum
Honored Contributor
Honored ContributorCyclone 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_ForumHonored Contributor
Honored ContributorHi,
Us is the same... we got 10 of 2500/ea dollar board with two fpgas... The failure happens when we remove the usb cable of the usb byteblaster while it is plug to a powered FPGA board... This sometimes short the FPGA jtag lines and we have two ocassions that the byteblaster fails and when tried using the faulty blaster to other board it consequently kills the fpga device wherever it is attach to... our preventive action is before connecting blaster to the powered fpga board we detect that the blaster will lit whenever we press the hardware button on the flash or quartus programmer this assure that the blaster is always power and configured.. The usb blaster errata is the closiest issue that i can relate the root cause of the problem... rgds, lanz
