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MEMORY CONTROLLER, STORAGE DEVICE AND MEMORY CONTROL METHOD

  • US 20150254131A1
  • Filed: 07/29/2014
  • Published: 09/10/2015
  • Est. Priority Date: 03/07/2014
  • Status: Abandoned Application
First Claim
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1. A memory controller configured to control nonvolatile memory including a memory cell in which data of K bits is storable in one memory cell, where K is an integer greater than or equal to two, a first bit of the data of K bits representing data of a first page and a second bit representing data of a second page, the memory controller comprising:

  • an encoder configured to encode unit data to write in the first page to generate a parity;

    a memory control unit configured to perform control to write the unit data and the parity in the nonvolatile memory at time of write in the first page, and to perform control to write the unit data in the nonvolatile memory at time of write in the second page;

    a decoder configured to perform an error correction process using the unit data and the parity read out from the nonvolatile memory; and

    a readout control unit configured to instruct the memory control unit to carry out readout using 2K

    1 first voltage values at time of readout from the first page and instruct the memory control unit to carry out readout using a second voltage values, which are different from the first voltage value and less in number than 2K

    1, at time of readout from the second page, and to select a bit value of the second page from a determination results of the bit value by the second voltage values based on the bit value of after the error correction of the first page;

    wherein the memory control unit performs the readout from the nonvolatile memory based on an instruction from the readout control unit.

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