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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

Usually, for busses that are biderectional, there is a master somewhere that knows what direction the bus is driving at all times. For your inputs, there would be a write_enable signal or similar so you know whether the input pins should be Z or not.

Using some external circuitry like those described above seems rather over complicated.