ARM Technical Support Knowledge Articles

General : What system support is required if a slave can be powered down or have its clock stopped?

Applies to: AHB

Answer

If a slave access is attempted while that slave is in a power down state or has had its clock stopped, you must ensure that an access will cause the power/clock to be restored, or else configure the AHB decoder up to redirect any such accesses to the dummy slave so that the system does not hang forever when an access to the device is made when it is disabled.

Redirecting the access in this way will ensure that random "IDLE" addresses are treated with the HREADY high and HRESP=OKAY default response, but real accesses (NONSEQ or SEQ) will be detected with an ERROR response.

 

 

Article last edited on: 2008-09-09 15:47:39

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