Real-Time Control of I/O COTS Peripherals for Embedded Systems

Stanley Bak, Emiliano Betti, Rodolfo Pellizzoni, Marco Caccamo, Lui Sha
2009 2009 30th IEEE Real-Time Systems Symposium  
Real-time embedded systems are increasingly being built using commercial-off-the-shelf (COTS) components such as mass-produced peripherals and buses to reduce costs, timeto-market, and increase performance. Unfortunately, COTS interconnect systems do not usually guarantee timeliness, and might experience severe timing degradation in the presence of high-bandwidth I/O peripherals. To address this problem, we designed a real-time I/O management system comprised of 1) real-time bridges, and 2) a
more » ... servation controller. The proposed framework is used to transparently put the I/O subsystem of a COTS-based embedded system under the discipline of real-time scheduling. We also discuss computing a delay bound for I/O data transactions and determining worst-case buffer size. Finally, we demonstrate experimentally that our prototype real-time I/O management system successfully prioritizes I/O traffic and guarantees its timeliness.
doi:10.1109/rtss.2009.41 dblp:conf/rtss/BakBPCS09 fatcat:jxcphgr4bvfx7of6mxfuwo4iu4