Qualcomm Incorporated

Sunil Oak

Vikas Kumar Sinha

Paul Kitchin

Nir Maor

Henry Stracovsky

Antonio Priore

A method of explicit lockstep for functional safety includes spawning, by a main thread, a first safe thread core and a second safe thread core. The method also includes initializing and mapping a first data register associated with the first safe thread core to each safe variable of a set of predetermined safe variables. The method further includes initializing and mapping a second data register associated with the second safe thread core to each safe variable of the set of predetermined safe variables. The method also includes comparing, by a hardware comparator, a first safe variable value in the first data register to a second safe variable value in the second register. The method further includes issuing an error completion to the first safe thread core and the second safe thread core when the hardware comparator detects a mismatch between the first data register and the second data register.

Explicit lockstep for functional safety

A clock signal in a device may be switched to a fallback clock signal if a clock fault is detected. One or more subsystem clock signals provided to one or more subsystems of the device may be monitored. If a fault associated with a clock signal is detected, then a fallback clock signal may be provided to the subsystem in place of the subsystem clock signal.

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Sunil Oak