1. A method for refreshing a non-clocked memory storing information from and providing information to a host, comprising the steps of: providing a refresh interface between said host and said non-clocked memory, to effect a refresh operation, said refresh interface comprising at least one refresh signal transferred from said host; issuing said at least one refresh signal to a refresh state machine to undertake said refresh operation; and issuing selectably timed column address refresh and row address refresh signals from said refresh state machine according to which said non-clocked memory is selectably refreshed, said selectably timed column address refresh and row address refresh signals having a predetermined selected level of overlap.