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[non-Reordering Device memory] Is IMPLEMENTATION DEFINED SIZE set in hardware or in software?

The "Armv8 Architecture Reference Manual" says the following about the non-Reordering attribute for Device memory:

"For all memory types with the non-Reordering attribute, the order of memory accesses arriving at a single peripheral of IMPLEMENTATION DEFINED size, as defined by the peripheral, must be the same order that occurs in a simple sequential execution of the program."

Who sets IMPLEMENTATION DEFINED SIZE? Is it set by the hardware engineer who designs the processor, or can IMPLEMENTATION DEFINED SIZE be configured by software, for example, when software sets up the page tables? Could someone point me to a section of the "Armv8 Architecture Reference Manual" that clarifies this?