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Memory initialization time reduction

  • US 8,140,937 B2
  • Filed: 01/04/2008
  • Issued: 03/20/2012
  • Est. Priority Date: 01/04/2008
  • Status: Active Grant
First Claim
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1. A computer system comprising:

  • a processor;

    a memory further comprising a first memory unit, the first memory unit further comprising more than one memory rank;

    a memory controller coupled to the processor and to the memory, the memory controller coupled to the memory unit with a rank select having a rank select signal unique to the each memory rank in the memory unit, the memory controller further comprising;

    a functional encoded rank select;

    an initialization encoded rank select;

    a multiplexer configured to select the functional encoded rank select or the initialization encoded ranks select and output an encoded rank select;

    a parity generator configured to generate a parity of the value of the encoded rank select;

    an initialization control configured to, during a memory initialization period;

    drive the initialization encoded rank select;

    cause the multiplexer to select the initialization encoded rank select; and

    cause a first rank select signal for a first memory rank and a second rank select signal for a second memory rank to be active at a particular time;

    the initialization control further configured, during functional reads and writes, to cause the multiplexer to select the functional encoded rank select;

    andan error checking and correcting (ECC) unit that receives the parity from the parity generator and which generates ECC bits that are stored in a memory rank having an active rank select signal.

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