Patent ID: 6643732
Filing Date: 2003-11-04
Classification: G11C

Abstract:
A method of internally executing an externally initiated access to a dynamic memory array including a plurality of dynamic memory cells wherein said dynamic memory cells require periodic refreshing, said method comprising:determining if an external access to said dynamic memory array has been initiated; thereafter waiting a RW idle time wherein said RW idle time comprises a sum of a row access time plus a pre-charge time and wherein a pending refresh is performed during said RW idle time and further comprising: detecting an address skew comprising said external access initiated by a transition of an address bus and said address bus changing state during said step of waiting a RW idle time; and restarting said step of waiting a RW idle time each time said address skew is detected; and restarting said step of waiting a RW idle time when a dummy read is detected; and thereafter internally executing said external access to said dynamic memory array.