1. A sub-system, comprising: an interface circuit in communication with a plurality of memory circuits and a system, the interface circuit operable to interface the memory circuits and the system for simulating at least one memory circuit with at least one aspect that is different from at least one aspect of at least one of the plurality of memory circuits; wherein the at least one aspect is selected from the group consisting of a signal, a capacity, a timing, and a logical interface; wherein the interface circuit is operable to interface the memory circuits and the system for simulating at least one memory circuit with a first memory capacity that is greater than a second memory capacity of at least one of the plurality of memory circuits.