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Altera_Forum's avatar
Altera_Forum
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9 years ago

DE1SOC max. GPIO Header Frequency

Hi, I have a short question. What is the maximum frequency on the DE1SOC board on the 2 GPIO headers "GPIO 0" and "GPIO 1". In the user manual I can't find it. I want to merge two FPGAs. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

The figure isn't in the manual because the max frequency depends on the rest of the circuit. If you do a proper transmission line design with termination you can get a much higher frequency than by casually connecting the pins together. Distance and the load on the other end also matters.

I've been able to get 4 MHZ connecting two FPGA boards together with jumper wires twisted together as a differential pair. It was fast enough for me so I didn't experiment to see how much faster it would go with better termination etc.