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    • 8. 发明公开
    • Semiconductor memory with refresh and redundancy circuit
    • Halbleiterspeicher mit Refresh- und Redundanzschaltungen
    • EP1596399A1
    • 2005-11-16
    • EP04257847.6
    • 2004-12-16
    • FUJITSU LIMITED
    • Okuyama, Yoshiaki, Fujitsu LimitedMori, Kaoru, Fujitsu Limited
    • G11C11/406G11C29/00
    • G11C11/406G11C11/40603G11C29/783
    • An arbiter (22) judges which of an internal access request and an external access request takes higher priority, when the internal access request conflicts with the external access request. A redundancy judgement circuit (28) judges which of a normal memory cell and a redundancy memory cell is accessed, in accordance with each of the internal access request and the external access request. When the arbiter (22) gives higher priority to the internal access request, the redundancy judgement circuit (28) carries out redundancy judgement for the external access request during internal access operation. To prevent the malfunction of a memory core (34), a hold circuit holds redundancy judged result, and prevents the redundancy judged result for the external access request from being transmitted to the memory core (34) that carries out the internal access operation.
    • 当内部访问请求与外部访问请求冲突时,仲裁器(22)判断哪个内部访问请求和外部访问请求具有较高优先级。 根据内部访问请求和外部访问请求中的每一个,冗余判断电路(28)判断访问正常存储单元和冗余存储单元中的哪一个。 当仲裁器(22)对内部访问请求给予较高优先级时,冗余判断电路(28)在内部访问操作期间对外部访问请求执行冗余判断。 为了防止存储器核心(34)的故障,保持电路保持冗余判断结果,并且防止外部访问请求的冗余判断结果被发送到执行内部访问操作的存储器核心(34)。