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  • Memory controller with multi-modal reference pad
    Patent number: 8068357
    Abstract: A memory controller operates in two modes to support different types of memory devices. In a first mode, the memory controller distributes a dedicated reference voltage with each of a plurality of signal bundles to a corresponding plurality of memory devices. The reference voltages are conveyed using pads that are alternatively used for e.g. timing-reference signals in a second mode, so the provision for bundle-specific reference voltages need not increase the number of pads on the memory controller.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: November 29, 2011
    Assignee: Rambus Inc.
    Inventors: Frederick Ware, John Wilson, John C. Eble, III, Jade M. Kizer, Lei Luo, John W. Poulton, Ian Shaeffer