Making DRAM Refresh Predictable

13 years 8 months ago
Making DRAM Refresh Predictable
Embedded control systems with hard real-time constraints require that deadlines are met at all times or the system may malfunction with potentially catastrophic consequences. Schedulability theory can assure deadlines for a given task set when periods and worst-case execution times (WCETs) of tasks are known. While periods are generally derived from the problem specification, a task's code needs to be statically analyzed to derive safe and tight bounds on . Such static timing analysis abstracts from program input and considers loop bounds and architectural features, such as pipelining and caching. However, unpredictability due to dynamic memory (DRAM) refresh cannot be accounted for by such analysis, which limits its applicability to systems with static memory (SRAM). In this paper, we assess the impact of DRAM refresh on task execution times and demonstrate how predictability is adversely affected leading to unsafe hard real-time system design. We subsequently contribute a novel ...
Balasubramanya Bhat, Frank Mueller
Added 09 Nov 2010
Updated 09 Nov 2010
Type Conference
Year 2010
Authors Balasubramanya Bhat, Frank Mueller
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