What is differential i / o

In the world of Spartan 3E Fpga, the documentation says

Most pins can be connected together to form differential I / O operations.

Question: what is differential input / output?

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As it turns out, the i / o differential refers to differential signaling:

http://en.wikipedia.org/wiki/Differential_signaling

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Source: https://habr.com/ru/post/1792406/


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