ArticlePeerJ. Computer science2023
Soft-core processor integration based on different instruction set architectures and field programmable gate array custom datapath implementation.
Article in PeerJ. Computer science, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
One of the fundamental requirements of a real-time system (RTS) is the need to guarantee re-al-time determinism for critical tasks. Task execution rates, operating system (OS) overhead, and task context switching times are just a few of the parameters that can cause jitter and missed deadlines in RTS with soft schedulers. Control systems that are susceptible to jitter can be used in the control of HARD RTS as long as the cumulative value of periodicity deviation and worst-case response time is less than the response time required by that application. This artcle presents field-programmable gate array (FPGA) soft-core processors integration based on different instruction set architectures (ISA), custom central processing unit (CPU) datapath, dedicated hardware thread context, and hardware real-time operating system (RTOS) implementations. Based on existing work problems, one parameter that can negatively influence the performance of an RTS is the additional costs due to the operating system. The scheduling and thread context switching operations can significantly degrade the programming limit for RTS, where the task switching frequency is high. In parallel with the improvement of software scheduling algorithms, their implementation in hardware has been proposed and validated to relieve the processor of scheduling overhead and reduce RTOS-specific overhead.
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