Periodic Online LBIST Considerations for a Multicore Processor

As Advanced Driver Assistance Systems (ADAS) in cars become a reality, more electronic applications in the automotive space require periodic online testing. High performance processors have historically been used for automotive applications that are not safety critical, such as info-tainment, and have not required much online test capability. However, these processors are now being utilized for applications, such as front-facing cameras, that will be used to aid automated driving. These are safety critical applications, so there must be some type of periodic online testing available for the processors implemented in these systems. Logic Built-in Self-Test (LBIST) is one type of testing commonly used for periodic testing or for Power on Self-Test (POST). This paper describes a periodic online LBIST flow for a multicore processor and some analysis on actual Arm® IP is shown to illustrate results for some parts of the flow.