The Research On Functional Safety Designed Method Of Heterogeneous Dual-processor System

Electronic equipments give people convenient life and efficient manufacturing, butalso led to a number of security incidents causing casualties. How to improve the securityof electronic devices has become an urgent research. International ElectrotechnicalCommission (IEC) develops a standard IEC61508in2000for the functional safety ofelectrical/electronic/programmable electronic safety-related systems. Based on IEC61508and china’s actual conditions, china develop a national standard GB/T20438.The study of the functional safety is still in initial stage. IEC61508specifies thesafety of safety-related product life cycle, including design, testing, and managementaspects. This paper introduces the design method of functional safety related systemswhich use the Heterogeneous dual-processor architecture.IEC61508is the theoretical support of the functional safety related systems. Thispaper gives a method to calculate the safety integrity level (SIL) Quantitative based onIEC61508. By this method, the designer can choose the right architecture and riskreduction strategies according to the need of SIL.This paper describes the design methods of heterogeneous dual processor functionalsafety system in both hardware and software parts. On the hardware side, describes thehardware failure reasons and chooses appropriate strategy. The most important strategyincludes heterogeneous design and self-diagnostic design. Introduce how to bringheterogeneous design and self-diagnostic design methods into specific circuits.On the software side, introduced the heterogeneous dual-processor system softwaredesign requirements and design a software architecture based on the requirements.Designed dual-processor communication, synchronization, heterogeneous design andself-diagnostic design methods and introduce some design examples and skills based onthe software architecture.I hope this paper can help the functional safety designers and give them someinspiration and in the future, more and more functional safety products designed in china.