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Question on duration of hsel in AHB

Hi,

My question is about duration of hsel in AHB. While performing a write operation to a particular slave, if hsel for the slave is asserted (hsel=1) in the address
face and is deasserted (hsel=0) in the data phase, will it guarantee that data is written to the slave? Is it sufficient asserting 'hsel' in address phase alone ?

Please explain how the hsel should be used to ensure a correct read/write operation.

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