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Altera_Forum's avatar
Altera_Forum
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9 years ago

Detect high impedance on the input pin

Hi to all, for my little project, I need to manage the output pin of any FPGA placing them at high impedance. This is not a problem, I can do it with MAX10 and Cyclone IV. However I would ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Hi DUESTERBERG, thanks for your aswers!

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  • connect your pin to another toggling pin with a 10k resistor and try to detect this frequency or pattern (eg: 1MHz)

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This could be ideal solution in my case.

I have two questions on this solution:

1) How detect the pattern from input pin in VHDL?

2) Can I use an external oscillator or should I use a FPGA internal pin?