Method and structure for using defective unrepairable semiconductor memory
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United States of America Patent
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Jul 23, 1996
Grant Date -
N/A
app pub date -
Aug 3, 1994
filing date -
Aug 3, 1994
priority date (Note) -
Expired
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Abstract
An apparatus utilizing a semiconductor memory includes a semiconductor memory with one or more permanent unrepairable defects. The use of defective semiconductor memory that was previously discarded significantly reduces the memory cost of the apparatus. A memory mapping circuit is used to convert an address for a defective memory location within the defective semiconductor memory to an address for a working memory location. The memory mapping circuit is transparent to the apparatus and the defective memory functions as an undefective memory. Consequently, an apparatus using the memory mapping circuit and the defective memory performs as apparatus with a memory that has no unrepairable defects.
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