Nxp Usa, Inc.

Vivek Kumar Yadav

Joseph Rollin Wright

Kumar Abhishek

Kushagra Khorwal

Vikram Joshi

Sanjaykumar Hansrajbhai Kakasaniya

A method for handling faults in an integrated circuit system includes receiving fault interface signals from safety-critical logic and generating a fault request indicating a fault and a domain identifier based on the fault interface signals. The fault interface signals include a fault signal and a fault domain identifier signal. In an embodiment of the method, the fault interface signals include synchronous signals received from the safety-critical logic using a synchronous interface and the synchronous signals include a fault clock signal. In an embodiment of the method, generating the fault request includes asserting the fault request in response to the fault signal having a first asserted signal level and maintaining assertion of the fault request until a fault acknowledgement is received from a fault collection and control circuit.

Fault interface architecture in safety-relevant systems

In an integrated circuit, a first always on (AON) domain generates an isolation signal to enter standby mode. A switchable power domain propagates the isolation signal. A voltage level detector outputs an indicator which indicates whether a voltage of the switchable power supply is above or below a voltage threshold. An isolation wrapper circuit includes a pass-through latch selectively enabled based on the output of the voltage level detector. The pass-through latch receives the propagated isolation signal and provides a value of the propagated isolation signal at its output while enabled, but maintains a latched value at its output, regardless of changes in value of the propagated isolation signal, while disabled. The wrapper circuit also includes an isolation circuit which receives signals from circuitry within the switchable power domain and selectively isolates the received signals from a second AON power domain based on the output of the pass-through latch.

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Austin, TX, United States of America

Vivek Kumar Yadav