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    • 23. 发明申请
    • SEMICONDUCTOR INTEGRATED CIRCUIT
    • 半导体集成电路
    • US20090052238A1
    • 2009-02-26
    • US12258964
    • 2008-10-27
    • Yutaka ShinagawaTakeshi KataokaEiichi IshikawaToshihiro TanakaKazumasa YanagisawaKazufumi Suzukawa
    • Yutaka ShinagawaTakeshi KataokaEiichi IshikawaToshihiro TanakaKazumasa YanagisawaKazufumi Suzukawa
    • G11C16/00
    • G11C16/349G11C16/06G11C16/3495
    • A semiconductor integrated circuit has a central processing unit and a rewritable nonvolatile memory area disposed in an address space of the central processing unit. The nonvolatile memory area has a first nonvolatile memory area and a second nonvolatile memory area, which memorize information depending on the difference of threshold voltages. The first nonvolatile memory area has the maximum variation width of a threshold voltage for memorizing information set larger than that of the second nonvolatile memory area. When the maximum variation width of the threshold voltage for memorizing information is larger, since stress to a memory cell owing to a rewrite operation of memory information becomes larger, it is inferior in a point of guaranteeing the number of times of rewrite operation; however, since a read current becomes larger, a read speed of memory information can be expedited. The first nonvolatile memory area can be prioritized to expedite a read speed of the memory information and the second nonvolatile memory area can be prioritized in guaranteeing the number of times of rewrite operation of memory information more.
    • 半导体集成电路具有设置在中央处理单元的地址空间中的中央处理单元和可重写的非易失性存储区域。 非易失性存储区域具有第一非易失性存储区域和第二非易失性存储器区域,其根据阈值电压的差异来存储信息。 第一非易失性存储区具有用于存储大于第二非易失性存储区的信息的阈值电压的最大变化宽度。 当用于存储信息的阈值电压的最大变化幅度较大时,由于由于存储信息的重写操作而对存储单元的应力变大,所以在保证重写操作次数方面较差; 然而,由于读取电流变大,因此可以加快存储器信息的读取速度。 优先考虑第一非易失性存储器区域以加快存储器信息的读取速度,并且可以优先考虑第二非易失性存储器区域,以保证存储器信息的重写操作的次数更多。