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Method and Apparatus for Performing Enhanced Read and Write Operations in a FLASH Memory System

  • US 20110040927A1
  • Filed: 12/21/2009
  • Published: 02/17/2011
  • Est. Priority Date: 08/11/2009
  • Status: Active Grant
First Claim
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1. A FLASH-based solid state storage system comprising:

  • a system controller including an external communication bus interface adapted to receive WRITE requests from an external host, where each WRITE request includes a Logical Block Address (LBA) and a page of data to be stored at the LBA;

    a volatile memory space accessible to the system controller;

    a FLASH memory space containing a plurality of physical address locations, each physical address location being capable of storing a page of data; and

    one or more communication buses coupling the system controller to the FLASH memory space,wherein the system controller is configured to maintain a logical to physical translation table in the volatile memory space, where the logical to physical translation table includes both;

    (i) entries associating a LBA with a physical address location within the FLASH memory space where, for each such entry, data is stored within the physical address location within the FLASH memory space; and

    (ii) entries associating a LBA with one or more data identifiers, where;

    (a) each such data identifier is associated with a specific data string,(b) each such data string corresponds to a specific block of data and not to any physical address location within the FLASH memory space; and

    (c) no physical address location within the FLASH memory space includes stored data corresponding to any of the specific blocks of data that correspond to a data string.

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