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Disk controller with volatile and non-volatile cache memories

  • US 5,586,291 A
  • Filed: 12/23/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 12/23/1994
  • Status: Expired due to Term
First Claim
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1. A disk controller coupled between a host computer and a disk drive, the disk controller comprising:

  • a controller microprocessor;

    a cache memory including;

    at least one volatile memory module; and

    at least one non-volatile memory module;

    a cache memory control circuit coupled to said at least one non-volatile memory module and said at least one volatile memory module wherein in response to a write command received from the host computer, said controller microprocessor allocates a predetermined number of memory blocks in each of said at least one volatile and said at least one non-volatile memory modules for storage of write-data and upon completion of a write operation to said at least one non-volatile memory modules, said cache memory control circuit transfers the write-data from said at least one non-volatile memory module to said at least one volatile memory module.

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