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Locked and exclusive transactions in AMBA AXI protocol

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asicengineer1

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Hi all,
I've a basic doubt in AMBA AXI protocol. I'm not able to differentiate much between locked and exclusive transactions. Could someone help me understand them better ?
 

Re: AXI transactions

Hi,

In a locked transaction, the interconnect much ensure that only the master is allowed access to the slave until an unlocked transfer from the same master completes.

In a exclusive transaction, the bus need not remain locked to a particular master for the duration of the operation.

Correct me if am wrong !!!
 

Re: AXI transactions

in locked transcation master locked the slave so no another master can it access upto the unlocked transfer is came.

in exclusive mode if slave is busy with some operation after completing that ,it gives responce to master i am ready to accept the transcation.in this other master can access this slave.
 

AXI transactions

In exclusive mode (semaphore type), once a master has read a particular memory location of slave, slave monitors (if slave supports exclusive mode) if any other master is accessing that memory. If so, when the earlier master tries to write on that memory slave responses with OKAY (which can be error to master), otherwise responses EXOKAY.
 

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