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ACE protocol Acknowledgement signal

Why even in after load and store operation RACK signal is given as an acknowledgement? why not WACK in case of store operations?

Parents
  • RACK and WACK correspond to transactions completing on the AR and AW channels respectively.  AR requests require the ACE manager to give a RACK, and AW requests require the ACE manager to give a WACK.

    For ACE managers, coherent stores are typically* performed by the ACE manager obtaining a Unique copy of the cache line within its cache.  This is generally performed using an operation on the AR channel, and so a RACK response is given.

    * The exceptions here are Write[Line]Uniques and memory update operations which are issued on the AW channel and so would result in a WACK response being given.

Reply
  • RACK and WACK correspond to transactions completing on the AR and AW channels respectively.  AR requests require the ACE manager to give a RACK, and AW requests require the ACE manager to give a WACK.

    For ACE managers, coherent stores are typically* performed by the ACE manager obtaining a Unique copy of the cache line within its cache.  This is generally performed using an operation on the AR channel, and so a RACK response is given.

    * The exceptions here are Write[Line]Uniques and memory update operations which are issued on the AW channel and so would result in a WACK response being given.

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