Configuring a fault-sensing ring oscillator circuit

An integrated circuit including a fault-sensing ring oscillator circuit, the integrated circuit comprising:

• a power controller;
• a plurality of ring oscillators, wherein the plurality of ring oscillators are enabled and disabled by an enable circuit of the power controller;
• an OR circuit including a plurality of inputs, wherein each input is coupled to a respective ring oscillator of the plurality of ring oscillators;
• and
• a first fault detection latch including a SET input coupled to a first output of the OR circuit and a RESET input coupled to the enable circuit,
• wherein the first fault detection latch indicates a stuck at fault condition when the plurality of ring oscillators are disabled by the enable circuit and at least one of the plurality of ring oscillators is active.

A method of a fault-sensing ring oscillator circuit, the method comprising:

• providing a fault-sensing ring oscillator circuit, the fault-sensing ring oscillator circuit including:
• a plurality of ring oscillators;
• an enable circuit configured to enable and disable the plurality of ring oscillators;
• an OR circuit including a plurality of inputs, wherein each input is coupled to a respective ring oscillator of the plurality of ring oscillators;
• and
• a fault detection latch including a SET input coupled to an output of the OR circuit and a RESET input coupled to the enable circuit;
• and
• detecting a stuck at fault condition indicated by the fault detection latch when the plurality of ring oscillators are disabled by the enable circuit and at least one of the plurality of ring oscillators is active.