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    • 10. 发明授权
    • Memory device having redundant cells
    • 具有冗余单元的存储器件
    • US06826712B2
    • 2004-11-30
    • US09783554
    • 2001-02-15
    • Chikai Ono
    • Chikai Ono
    • G06F1100
    • G11C29/789G11C11/22
    • According to an aspect of the present invention, a redundant file memory for recording first replacement information having an address of a defective cell to be replaced with a redundant cell is configured by a memory cell having the same configuration as an ordinary memory cell, and when accessing the ordinary memory cell, the redundant file memory can be accessed at the same time. Furthermore, second replacement information indicating whether or not the ordinary cell in correspondence with the stored address is a defective one is recorded in the redundant file memory. When accessing the ordinary memory cell, the first and second replacement information recorded in the redundant file memory are read out at the same time, and the defective cell is replaced with the redundant cell according to the replacement information.
    • 根据本发明的一个方面,用于记录具有由冗余单元替代的缺陷单元的地址的第一替换信息的冗余文件存储器由具有与普通存储单元相同配置的存储单元配置,并且当 访问普通存储单元,可以同时访问冗余文件存储器。 此外,指示与存储的地址相对应的普通小区是否是有缺陷的第二替换信息被记录在冗余文件存储器中。 当访问普通存储单元时,同时读出记录在冗余文件存储器中的第一和第二替换信息,并根据替换信息用冗余单元替换缺陷单元。