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@@ -47,3 +47,13 @@ PAL chips come in different variants with different features that impact their i
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- "simple" inputs
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- asynchronous feedbacks from the outputs
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- synchronous feedbacks from the registered outputs
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+
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+### "Simple" inputs
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+
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+These inputs are directly connected to an external pin of the chip, and can be directly toggled by the external circuit.
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+Some pins, called I/O, can be configured to act as an input or as an output (which value then gets used as an asynchronous feedback).
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+
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+### Asynchronous feedbacks
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+
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+### Synchronous feedbacks
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+
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