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Address translation logic which permits a monolithic memory to utilize defective storage cells

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专利汇可以提供Address translation logic which permits a monolithic memory to utilize defective storage cells专利检索,专利查询,专利分析的服务。并且In the production of monolithic memory chips used in computer storage devices a certain percentage is rejected in production as containing one or more defective bit cells on the chip. These almost perfect chips are arranged on a memory card bit so that all of the bit cards of a particular memory product are identical to those sections containing defective bit cells. The valid cells are logically arranged in contiguous address locations by translation logic which converts the address before it is presented to the memory bit cards. Addresses presented to the logic are re-ordered such that all addresses that, untranslated, would have selected a defective area of a chip, after being translated select a non-defective area of a chip.,下面是Address translation logic which permits a monolithic memory to utilize defective storage cells专利的具体信息内容。

1. For use in a memory system of the type in which a plurality of addressable locations are selected by decoding means which decode a cOntiguous set of unique first address manifestations, a translator for translating said first address manifestation into a set of unique second address manifestations which omit predetermined ones of said contiguous set comprising: a number (n-k) of input leads each representing a bit position order of said first address manifestations; a number (m) of output leads each representing a bit position of said second address manifestations and having a one-for-one correspondence with said first input leads; means connecting each of k input leads to the next higher order output lead; and means connecting at least one of said k input leads to two or more of said output leads; whereby said decoder translates n of the address bits comprising said first address manifestations into m address bits of said second address manifestations wherein one of said n bits controls at least two of said m bits.
2. The combination according to claim 1 wherein the input lead representing the highest order bit position of said first address manifestation is exclusive ORed with said means connecting said one of said k input leads to said two of said output leads.
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