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AHB split retry response

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Note: This was originally posted on 9th December 2008 at http://forums.arm.com

IN AMBA AHB , there are split and retry response. These are 2 cycle responses.
whole SPLIT sequence is given in the spec. but my doubt is in which scenario slave
has to to issue SPLIT and RETRY response?

Waiting for the reply. Thanks in advance.
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  • 0
    Note: This was originally posted on 9th December 2008 at http://forums.arm.com

    Visiuser,

    An AHB slave never *has* to give a SPLIT or a RETRY response; these responses are simply optimisations such that a slave which knows it is going to take a long time to provide the requested data can, potentially, offer improved overall system performance.

    It would be perfectly legal for a simple AHB slave to only implement OK (as an aside, AHB-Lite only supports OK and ERROR).

    hth
    s.



    Hi,

    For simple AHB slave only ERROR and OK responses are fine. but if I have multiple master
    and slaves , then I think I need to give SPLIT  and RETRY responses both. I understood point
    behind SPLIT  response .

    But for RETRY response what will be the scenario??

    Thanks ,
    vlsiuser
Reply
  • 0
    Note: This was originally posted on 9th December 2008 at http://forums.arm.com

    Visiuser,

    An AHB slave never *has* to give a SPLIT or a RETRY response; these responses are simply optimisations such that a slave which knows it is going to take a long time to provide the requested data can, potentially, offer improved overall system performance.

    It would be perfectly legal for a simple AHB slave to only implement OK (as an aside, AHB-Lite only supports OK and ERROR).

    hth
    s.



    Hi,

    For simple AHB slave only ERROR and OK responses are fine. but if I have multiple master
    and slaves , then I think I need to give SPLIT  and RETRY responses both. I understood point
    behind SPLIT  response .

    But for RETRY response what will be the scenario??

    Thanks ,
    vlsiuser
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