Processor operation inspection system and operation inspection circuit
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United States of America Patent
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Nov 15, 2011
Grant Date -
Apr 29, 2010
app pub date -
Jun 13, 2008
filing date -
Jun 13, 2007
priority date (Note) -
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Abstract
A processor operation inspection system includes a processor and an operation inspection circuit that inspects an operation of the processor. When a program under execution changes from one predefined state to another state, the processor outputs a state switching signal indicating a transition of its state, a state signal indicating a current state to the inspection circuit. The inspection circuit includes a state register that stores the state of the processor, a combinational logic circuit that calculates, according to the stored state of the processor and the state switching signal, a new state to be taken by the processor, and a comparison circuit that inspects the operation of the processor by comparing the calculated new state to the state of the processor inputted as the state signal.
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