External memory access control for a processing system.

摘要

There is disclosed a processing system of the type having a processor which accesses external memory for data and/or instructions which includes an improved external memory access control system for rendering the external memory enable time durations independent from the number of external memory accesses per unit of time for reducing power consumption of the processing system. The control system includes clock means for providing a clock signal which determines the external memory access rate and enable duration control means coupled to the clock means which is arranged to enable the external memory for time durations during each memory access which are independent from the external memory access rate.