Each cell in design will have timing arcs, there are different types of arcs present in design. For example, for sequential cell , timing arc will be from clock to Q , for Combi logic, timing arc will be from input to output. Each timing arc has a timing sense ,  with this output of cells changes with different types of transition happens on input. Position unate and negative unate is related to transition on timing arcs.

A Positive Unate is , rising transition on input causes output to rise and falling transition on input causes output to fall , a simple example is given below.




A Negative Unate is, rising transition on input causes output to fall , and falling transition on input causes output to rise , a simple example is given below.

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