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Altera_Forum's avatar
Altera_Forum
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16 years ago

problem with cyclone III and jtag

I would like to put a very serious discussion about using jtag with cyclone III. has cyclone3 less electrical tolerance compared to other FPGA's?????? . we are building a custom board. and t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

You are right. They don't put the clamping diodes on figure 9-24, and instead recommend to use vcca (2.5V) as the jtag i/o power supply instead of the bank 3.0/3.3V supply. It works too, but I find the clamping diodes safer.