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    • 7. 发明授权
    • Single package dual memory device
    • 单包双存储器件
    • US06122216A
    • 2000-09-19
    • US208306
    • 1998-12-09
    • Don Dykes
    • Don Dykes
    • G11C8/12G11C11/00G11C8/00
    • G11C8/12G11C11/005
    • A dual function memory device having a RAM array and a ROM array contained in a single integrated circuit package. Preferably the RAM cells are static RAM cells, and the ROM cells are flash ROM. Either the RAM cells or the ROM cells, but not both, can be accessed during a single memory transaction. The memory device includes a ROM select signal that determines selects the operating mode for the memory. When the ROM select is asserted, the ROM cells can be accessed so that the memory device operates as a ROM. When the ROM select signal is deasserted, the RAM cells can be accessed so that the memory device operates as a RAM. The RAM and ROM arrays connect to a common address bus and thus occupy separate address spaces. The RAM and ROM arrays also connect to a common data bus and may share a plurality of control signals.
    • 具有包含在单个集成电路封装中的RAM阵列和ROM阵列的双功能存储器件。 优选地,RAM单元是静态RAM单元,ROM单元是闪存ROM。 可以在单个存储器事务期间访问RAM单元或ROM单元,但不能两者。 存储器件包括确定选择存储器的操作模式的ROM选择信号。 当ROM选择被确认时,可以访问ROM单元,使得存储器件作为ROM工作。 当ROM选择信号无效时,可以访问RAM单元,使得存储器件作为RAM工作。 RAM和ROM阵列连接到公共地址总线,从而占用单独的地址空间。 RAM和ROM阵列还连接到公共数据总线,并且可以共享多个控制信号。