Memory-access management method and system for synchronous dynamic random-access memory or the like

A memory-page management system for tracking an access history of a memory unit, comprising:

• a memory unit, having N memory pages;
• a managing device for managing the N memory pages, further comprising:
• a page register unit for storing K storage units, each of the storage units stores an address data corresponding to one of the memory pages;
• and
• a utilization-rate register unit, coupled to the page register circuit, for monitoring utilizations of the storage units;
• wherein the number K is less than the number N.

A memory-access management method for tracking access history to a memory unit having N memory pages, which comprises the steps of:

• (1) providing a page table for storing a predefined number K of recently accessed memory locations to the memory unit, each stored memory location being stored along with a least-recently-used record and a validity bit, with the least-recently-used record indicative of whether the associated memory location is least recently used and the validity bit indicative of whether the associated memory location is valid or invalid, wherein the number K is less than the number N;
• (2) in response to an access request, comparing the requested memory location with the memory location data stored in the page table to see if there is a match;
• if yes, generating a hit signal;
• whereas
• if not, replacing the one of the stored memory locations in the page table that is least recently accessed with the memory location of the current access request;
• and
• (3) checking whether the associated validity bit of the least recently-accessed memory location is set to indicate validity;
• if yes, generating a restore signal is generated to restore the corresponding memory location to original state.