Dynamically changing control of sequenced power gating
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United States of America Patent
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Jul 12, 2011
Grant Date -
May 7, 2009
app pub date -
Nov 5, 2007
filing date -
Nov 5, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Power control circuitry for controlling connection of a voltage source to a switched power rail powering an associated circuit is provided. A plurality of switch blocks are connected in parallel between the switched power rail and the voltage source, each switch block being controlled by an enable signal provided by a switch controller. The switch controller performs a turn-on sequence providing a series of enable signal patterns to the switch blocks. The switch controller applies a time varying generation operation to at least one sequence stage of a predetermined turn-on sequence to produce a corresponding enable signal pattern for that sequence stage. When the turn-on sequence is later repeated, the enable signal pattern produced for at least one of the sequence stages differs from the enable signal pattern previously produced for that sequence stage.
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