Semiconductor memory device which delays refreshme

专利名称：Semiconductor memory device which delays

refreshment signal for performing self-refreshment

发明人：Kenichi Sakakibara申请号：US12314748申请日：20081216

公开号：US20090161456A1公开日：20090625

专利附图：

摘要：A semiconductor memory device having two refreshment modes of auto-refreshment and partial self-refreshment imposed on memory cells includes a commanddecoder which detects one of the refreshment modes from an input command, outputstype data which indicates the detected refreshment mode, and outputs a refreshmentsignal which indicates the start of refreshment; a mode register in which the type data isset; a signal selection circuit which determines whether or not the refreshment signal is

to be delayed, in accordance with the type data set in the mode register, and outputs therefreshment signal, which is delayed or not delayed in accordance with the result of thedetermination, as a refreshment start signal; and a control circuit which reads the typedata set in the mode register based when receiving the refreshment start signal, andperforms refreshment corresponding to the type data.

申请人：Kenichi Sakakibara

地址：Tokyo JP

国籍：JP

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