Electrical computers and digital processing systems: support – Synchronization of clock or timing signals – data – or pulses
Reexamination Certificate
2007-07-24
2007-07-24
Bullock, Jr., Lewis A. (Department: 2195)
Electrical computers and digital processing systems: support
Synchronization of clock or timing signals, data, or pulses
C709S248000, C709S237000
Reexamination Certificate
active
09977145
ABSTRACT:
A method and apparatus for coordinating the activities of multiple computers using a common reference point such as a Global Positioning System pulse-per-second signal. A reload register transmits a reload value to a mission timer. The mission timer generates an interrupt signal based upon the reload value. A timer capture register captures the countdown value of the mission timer when a pulse-per-second signal is asserted. Software generates new reload values based upon the countdown value captured by the timer capture register. Additional timer capture registers may be used to form a consensus value of the countdown value when the pulse-per-second signal is asserted. A local pulse-per-second signal generator may be used when a Global Positioning System pulse-per-second signal is not available.
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Bullock, Jr. Lewis A.
General Dynamics Advanced Information Systems Inc.
Steptoe & Johnson LLP
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