Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

2011-07-12

2011-07-12

Ho, Hoai V (Department: 2827)

Static information storage and retrieval

Read/write circuit

Separate read and write bus

C365S185010, C365S185240, C365S185220, C365S185110, C365S189180

Reexamination Certificate

active

07978545

ABSTRACT:
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 to guarantee the number of times of rewrite operation of memory information more.

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Yukio Fujisawa, “SH-2 Series no Tokucho, Super H Processor”, 2ndedition, CQ Publishing Co., Ltd., Aug. 1, 2000, pp. 90-95.

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