Abnormal circuit operation detection system
First Claim
Patent Images
1. An abnormal operation detection system comprising:
- a monitored integrated circuit device having a configuration of a state machine in which a plurality of states and conditions for state transitions are defined, said monitored integrated circuit device having a function to output a state number indicating a state of said state machine;
a power consumption detection circuit detecting power consumption of said monitored integrated circuit device; and
a monitoring circuit determining the presence or absence of abnormality in said detected power consumption by using an abnormality evaluation value corresponding to the state number output from said monitored integrated circuit device.
1 Assignment
0 Petitions
Accused Products
Abstract
An abnormality in operation is detected by meticulously monitoring the operation of a monitored device that comprises a state machine. The state number, indicating the state the monitored device is currently in, is output from the device. The upper and lower limit values of current consumption is set for each state number. A monitoring circuit, using the upper and lower limit values for the present state number, judges the value of current consumption detected by a current detection circuit and detects whether there is abnormality in operation.
16 Citations
8 Claims
-
1. An abnormal operation detection system comprising:
-
a monitored integrated circuit device having a configuration of a state machine in which a plurality of states and conditions for state transitions are defined, said monitored integrated circuit device having a function to output a state number indicating a state of said state machine; a power consumption detection circuit detecting power consumption of said monitored integrated circuit device; and a monitoring circuit determining the presence or absence of abnormality in said detected power consumption by using an abnormality evaluation value corresponding to the state number output from said monitored integrated circuit device. - View Dependent Claims (2, 3, 4, 5, 6, 8)
-
-
7. A system, comprising:
-
a monitored integrated circuit device having a configuration of a state machine having internal states and conditions for state transitions of the monitored integrated circuit device and outputting numerical values indicating internal states of said monitored integrated circuit device; a power consumption detection circuit detecting power consumption of said monitored integrated circuit device; and a monitoring circuit determining abnormality in the power consumption by comparing abnormality values to the numerical values output from said monitored integrated circuit device.
-
Specification