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DEVSEL assertion

Answers are welcome for :

Once the master supplies the address, the target corresponding to
that address will assert the DEVSEL signal.
Why the fast, medium slow DEVSEL assertions? If the address is
latched by the target and understood that it is the concerned slave for that 
address, why it takes two or 3 clock cycles for the
assertion of its DEVSEL.

As soon as it decodes ( localised decoding) the address, it asserts
the DEVSEL. Why this kind of fast, med......

What is the reason behind this type of decodings?

Thanks in advance.

Srinivas B
3rd July 1610hrs

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