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    • 65. 发明授权
    • Test circuit for refresh counter of clock synchronous type semiconductor
memory device
    • 时钟同步型半导体存储器件刷新计数器的测试电路
    • US5471430A
    • 1995-11-28
    • US245784
    • 1994-05-19
    • Seiji SawadaYasuhiro Konishi
    • Seiji SawadaYasuhiro Konishi
    • G11C11/401G11C11/403G11C11/406G11C11/407G11C11/409G11C29/00G11C29/02G11C29/08G11C11/34
    • G11C29/02G11C11/406
    • A synchronous semiconductor memory device includes an automatic refresh detection circuit for detecting that an automatic refresh mode is specified in accordance with an automatic refresh command, an address counter for generating a refresh address, a refresh execution unit for refreshing a memory array in accordance with an automatic refresh detection signal and the refresh address, an inactivation circuit for inactivating the refresh execution unit after a lapse of a prescribed time in accordance with the automatic refresh detection signal, a counter check mode detection circuit for bringing the inactivation circuit into an inoperable state in accordance with a counter check mode command, and a second inactivation circuit for inactivating the refresh execution unit in accordance with a precharge detection signal generated in response to a precharge command. Thus synchronous semiconductor memory device with an operation mode which can test the function of an internal refresh address counter is provided.
    • 同步半导体存储器件包括自动刷新检测电路,用于检测根据自动刷新命令指定自动刷新模式,用于产生刷新地址的地址计数器,用于根据存储器阵列刷新存储器阵列的刷新执行单元 自动刷新检测信号和刷新地址,用于根据自动刷新检测信号在经过规定时间之后使刷新执行单元失活的灭活电路,用于使灭活电路处于不可操作状态的计数器检查模式检测电路 根据计数器检查模式命令,以及第二失活电路,用于根据预充电命令产生的预充电检测信号,使刷新执行单元失效。 因此,提供了具有可以测试内部刷新地址计数器的功能的操作模式的同步半导体存储器件。