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CASCADE INTERCONNECT MEMORY SYSTEM WITH ENHANCED RELIABILITY

  • US 20100005366A1
  • Filed: 07/01/2008
  • Published: 01/07/2010
  • Est. Priority Date: 07/01/2008
  • Status: Active Grant
First Claim
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1. A hub device comprising:

  • an interface to a high speed bus for communicating with a memory controller, the memory controller and the hub device included in a cascade interconnect memory system and the high-speed bus including bit lanes and one or more clock lanes;

    a bi-directional fault signal line in communication with the memory controller and readable by a service interface;

    a fault isolation register (FIR) for storing information about failures detected at the hub device, the information including severity levels of the detected failures; and

    error recovery logic for responding to a failure detected at the hub device, the responding including;

    recording a severity level of the failure in the FIR; and

    taking an action at the hub device that is responsive to the severity level of the failure, the action including one or more of fast clock stop, setting the bi-directional fault indicator, setting cyclical redundancy code (CRC) bits and transmitting them to the memory controller, re-try, sparing out a bit lane and sparing out a clock lane.

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