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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

JTAG connection issue

Hi all, I have a board that configured the Cyclone 4 E device JTAG signals with 2.5V with 100 ohm series resistor on all signals and TMS, TDI pulled up to 2.5V through 2.2k resistors. I ob...
benc's avatar
benc
Icon for New Contributor rankNew Contributor
8 years ago

It's been some time and I would like to give an update since I just got my custom base board for testing.

It turns out that without the system controller (another CPLD connected to the JTAG signals), and a change of the termination resistors (22R instead of 100R) near the JTAG connector solves the problem.