Forum Discussion

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

Disabled JTAG circuitry pins connection

Hallo, I have to connect a daughterboard to a system of my own (main board) which is almost pin-compatible with my previous design. The only problem, is that for a JTAG which I will not use in...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

It surely won't explode. But I remember cases, where a too high TCK pull-down resistor (10K instead of 1K) made the JTAG circuit pick up interferences and caused configuration reset or similar kinds of failure. I think, the chance to hit valid boundary scan commands by accident and cause dangerous IO actions is very small.