ARM Technical Support Knowledge Articles

Split/Retry: What address should be on the bus during the IDLE cycle after a SPLIT or RETRY?

Applies to: AHB

Answer

It does not matter what address is driven onto the bus during this cycle. The slave selected by the driven address should not take any action and must respond with a zero wait state OKAY response.

In many cases it will be simpler for the master to leave the address unaltered during this cycle, so that it remains at the address of the next transfer that the master wishes to perform and only in the following cycle does the master return the address to that of the transfer that must be repeated because of the SPLIT or RETRY response.

In some designs it may be possible for the master to return the address to that required to repeat the previous transfer during the IDLE cycle and this behaviour is also perfectly acceptable.

See also:

Article last edited on: 2014-02-05 16:02:49

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