| 摘要 |
The circuit includes a column address strobe bar(CAS) before row address strobe bar(RAS)(DBREXT) detector which generates CBREXT signal keeping logical high state, an oscillating circuit which generates very short reference pulse signal, a frequency dividing chain which generates a second dividing pulse signals having longer period than that of a first dividing pulse signal, a self-refresh signal generating circuit which generates self-refresh control signal for setting to self-refresh mode, a burst signal generating circuit which generates burst signal with high speed refresh period which is smaller than the enable period of the self-refresh control signal, a row address signal generating circuit which generates row address strobe signal with the period of the first dividing pulse signal, and a controlling circuit which outputs the row address strobe signal and the row address strobe bar signal selectively.
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