Forum Discussion
Altera_Forum
Honored Contributor
Honored ContributorProblem with JTAG
Hi, I use an USB Blaster cable to program an EP3C25U256 an EPCS16 with quartus II web edition 11.1. First, I programmed several times without any problem and after a while, i received an error ...
Altera_ForumHonored Contributor
Honored ContributorNo this shouldn't change anything.
When I talked about earthing I meant with a working board. It it is indeed ESD of overvoltage on a pin, once the JTAG pin is short circuited there is nothing you can so, other than change the FPGA. Could you look at the JTAG signals with a scope (on a working board)? Check especially the overshoot when transiting from a 0 to a 1. It should never exceed 4.1V IIRC.
