4.4.2. Function and operation of module

The default slave only responds to transfers when it is selected by the decoder with the HSEL input when an undefined region of memory is accessed. The response generated depends on the type of transfer that is performed.

If an IDLE or BUSY transfer is performed, the default slave must provide a zero wait OKAY response because the master does not expect to receive any data back from these transfers.

If a NONSEQUENTIAL or SEQUENTIAL transfer is performed, an ERROR response is generated, because there is nothing at the current location that can be written to or read from. The standard two-cycle ERROR response is provided with one wait state.

Copyright © 2001 ARM Limited. All rights reserved.ARM DDI 0226A
Non-Confidential