METHOD AND SYSTEM FOR PRESERVING AND RESTORING SCAN- BASED STATE FOR INACTIVE STATE POWER REDUCTION

摘要

PROBLEM TO BE SOLVED: To realize inactive state power reduction. SOLUTION: In this method and system for preserving and restoring a scan- based state for inactive state power reduction, an integrated circuit (130) is provided with an inactive state power reduction manager (160) and a normal circuitry and a scan circuitry (150). At the time of receiving a sleep signal, the state of the normal circuitry is accessed by using the scan circuitry (150). Then, the state is stored in a memory (270). A power source is disconnected from the normal circuitry, In wake-up, the normal circuitry is reconnected to a power source (200). The state of the circuit is accessed from the memory (270), and restored to the normal circuitry by using the scan circuitry (150).