Method and apparatus for dynamically creating conversion tables to access a semiconductor memory device
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Apr 15, 1997
filing date -
Apr 15, 1996
priority date (Note) -
Expired
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Abstract
An improved external semiconductor memory device having a work memory for storing logical address-physical address conversion information. According to one embodiment of the present invention, a semiconductor memory device, which is connected to a host computer system and can be addressed as predetermined sector units, comprises: (a) a data storage having a nonvolatile memory that can be electrically rewritten; (b) an interface connected to the host computer system for receiving an access request; (c) volatile work memory; (d) first table preparating means for preparing a first table in the volatile work memory, by the page which consists of a plurality of sectors, for converting the requested logical sector address into a physical sector address among a physical memory space of the data storage; (e) second table preparation means for preparing a second table in the volatile work memory, by the unit which consists of a plurality of pages, for converting a logical page numbers addressed by the access request into a physical page numbers among a physical memory space of the data storage; (f) second access control means for, in response to an access request from the host computer system, referring to the second table for a unit to which the designated logical sector address belongs in order to acquire a corresponding physical page number; (g) first access control means for, in response to an access request from the host computer system, referring to the first table for a physical page to which the designated logical sector address belongs in order to acquire a corresponding physical sector address; and (h) data access means for accessing the data storage in accordance with the acquired physical sector address.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- INTERNATIONAL BUSINESS MACHINES CORPORATION
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Sakakura, Tohru | Yamato, JP | 2 | 130 |
Sakaue, Yoshinori | Sagamihara, JP | 15 | 1220 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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