| 摘要 |
PURPOSE: To reduce a refreshing regulated time by burst refreshing for a short time before/after self-refreshing. CONSTITUTION: A self-refreshing detecting part 10 receives AN input control signal bar RAS and a bar CAS and after the lapse of a set time, enables a refreshing entry signalϕSRAS and disables it by the release of this. A burst refresh control part 12 detects the trigger point of the signalϕSRAS to output a burst control signalϕBRE. This is made the pulse string CK0 of a period t1 by counter 14, counted and set by a counter 16 and then the control part 12 is stopped to disable the signalϕBRE. A self-refreshing control part 18 receives this and enables a self control signalϕsref, and a counter 20 outputs the pulse string CK1 of a period t2 . A master clock part 22 outputs the enabled one of the pulse strings CK0 and CK1 as a master clockϕself p for selecting a word line.
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