Scan-based state save and restore method and system for inactive state power reduction
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United States of America Patent
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Jun 6, 2006
Grant Date -
Oct 31, 2002
app pub date -
Apr 26, 2001
filing date -
Apr 26, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scan-based state save and restore method and system for inactive state power reduction. An integrated circuit that has an inactive state has normal circuitry and scan circuitry. Upon receipt of a sleep signal, the state of the normal circuitry is accessed by employing scan circuitry. The state is then stored in a memory. The power is disconnected from the normal circuitry. Upon wake-up, the normal circuitry is re-connected to the power. The state of the circuit is accessed from the memory and restored to the normal circuitry by employing scan circuitry.
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