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Altera_Forum's avatar
Altera_Forum
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15 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
15 years ago

It isn't a problem at all. I usually do that when I have enough space on the board. It makes the board more tolerant and offers more protection on the FPGA JTAG pins. If you put the buffer close to the FPGA you don't have to worry about overshoots.

Just be sure to select a buffer that is fast enough for the JTAG signals. I use a SN74LVC541A, and it works very well. All the JTAG signals go through the buffer.