Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2007-12-04
2007-12-04
Song, Jasmine (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S005000, C711S106000, C365S230030
Reexamination Certificate
active
10988290
ABSTRACT:
A structure of sequencers, a method, and a computer program are provided for performing initial and periodic calibrations in an XDR™ memory system. A memory controller that performs these calibrations is divided into identical, independent halves, with each half containing a Current/Impedance Calibration (i/z Cal) sequencer and six Bank sequencers. The i/z Cal sequencer contains three pathways that perform the XIO current and termination calibrations, and the XDR™ DRAM current and termination impedance calibrations. Each Bank sequencer contains normal read and write operation pathways that are reused to accomplish receive setup, receive hold, transmit setup, transmit hold, XIO receive, and XIO transmit timing calibrations. Initial and periodic calibrations are necessary to ensure the precise transfer of data between the XIOs and the XDR™ DRAMs.
REFERENCES:
patent: 6310814 (2001-10-01), Hampel et al.
patent: 6493836 (2002-12-01), Olarig et al.
patent: 6628216 (2003-09-01), Chen et al.
patent: 6631440 (2003-10-01), Jenne et al.
patent: 6714886 (2004-03-01), Sung et al.
patent: 6836831 (2004-12-01), Borkenhagen et al.
patent: 6842393 (2005-01-01), Ryan et al.
Bellows Mark David
Heckendorf Ryan Abel
International Business Machines - Corporation
Rifai D'Ann N.
Song Jasmine
Tkacs Stephen R.
Walder, Jr. Stephen J.
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