A clock-synchronous semiconductor memory device includes many memory cells arranged in matrix, a count section for counting the actual number of cycles of a continuous, externally-supplied basic clock signal, a control section for inputting a row enable control signal (/RE) and the column enable control...http://www.google.com/patents/US6310821?utm_source=gb-gplus-sharePatent US6310821 - Clock-synchronous semiconductor memory device and access method thereof
