Synchronous integrated electronic circuit, has intelligence circuit with state detection cell to produces state signal representing logic state of output signal delivered by logical combination of control signals received on conductors

摘要

#CMT# #/CMT# The circuit has configurable cells controlled by control signals for adopting an operational or test mode. An intelligence circuit detects abnormal excitation of control conductors (K1-K4, K21-K23) over which the signals pass. The intelligence circuit has a combinational logic circuit (311) for logical combination of the signals received on the conductors and delivering an output signal in a state if the control signal in test or operational mode is inactive and other control signals are active. A state detection cell (312) produces a state signal representing output signal`s logic state. #CMT#USE : #/CMT# Synchronous integrated electronic circuit. #CMT#ADVANTAGE : #/CMT# The intelligence circuit permits to adopt a state representative of the absence of anomaly or a fraud attempt of intrusion to the output signal so that the combination of signals transiting over the conductors corresponds or not corresponds to a combinations of the signals observable in the authorized operational state of the electronic circuit. The intelligence circuit can thus warn, in case of break up of coherence between the states, that one of the conductors on which a control signal transits normally constrains an attack aiming to force the signal to a value different from that which provides the coherence. The electronic circuit permits the placement of the intelligence circuit and the routing of the conductors towards the intelligence circuit in a simple and inexpensive manner. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a synchronous integrated electronic circuit. K1-K4, K21-K23 : Control conductors LOG : Logic circuit 2a, 2w, 2z : Configurable cells 311 : Combinational logic circuit 312 : State detection cell `(Drawing contains non-English language text)`.