1. Apparatus for passively tracking expired data in a dynamic memory, the apparatus comprising: a time stamp memory configurable for storing information relating to a refresh status of one or more corresponding data entries in the dynamic memory; a timer configurable for defining a desired window of time in which a refresh operation of data in the dynamic memory is to occur in order to ensure that the data is valid; and control circuitry coupled to the time stamp memory and to the timer, the control circuitry being operative to manage the information stored in the time stamp memory relating to the refresh status of the one or more corresponding data entries in the dynamic memory.