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Relationship between PSEL and PENABLE signals in the APB Protocol.

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Hello All, 

I have some doubts related to the relationship between PSEL and PENABLE signals in the APB Protocol. The specification informs that:

The PENABLE signal is asserted the following clock after PSEL is asserted and de-asserted after a transfer takes place.

I would like to understand about the following conditions:

1) Can PENABLE toggle while PSEL is de-asserted?

2) Can PENABLE be asserted in the IDLE and/or SETUP phase?

3) Can PSEL go log in to the SETUP phase?

4) What happens when PSEL is asserted high in the ACCESS phase and PENABLE is not de-asserted?



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