Semiconductor disk storage

Details Semiconductor disk storage Semiconductor disk storage

1996-03-06

1997-02-25

Fears, Terrell W.

Static information storage and retrieval

Addressing

Plural blocks or banks

36523001, G11C 1300

Patent

active

056065299

ABSTRACT:
A semiconductor storage device transfers data with an information processing device and includes a non-volatile semiconductor memory in which data is electrically re-writable, a volatile semiconductor memory connected to the non-volatile memory and temporarily storing data of the non-volatile semiconductor memory, and a CPU connected to the volatile semiconductor memory and the non-volatile semiconductor memory. The CPU controls the transfer of data among the non-volatile memory, the volatile memory and the CPU. The CPU also transfers data with the information processing device in accordance with a fixed-length form for data. When an access from the CPU to the volatile semiconductor makes a miss hit (i.e., misses), the CPU accesses the non-volatile semiconductor memory. When a failure is generated in the non-volatile semiconductor memory or when a predicted service life of the non-volatile semiconductor memory is elapsed, the non-volatile semiconductor memory can be substituted by an alternate memory.

REFERENCES:
patent: 4694428 (1987-09-01), Matsumura et al.
patent: 5307471 (1994-04-01), Ishikawa

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