首页> 外文会议>International Symposium on Computer and Information Sciences(ISCIS 2006); 20061101-03; Istanbul(TR) >Virtual-ROM: A New Demand Paging Component for RTOS and NAND Flash Memory Based Mobile Devices
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Virtual-ROM: A New Demand Paging Component for RTOS and NAND Flash Memory Based Mobile Devices

机译:虚拟ROM:基于RTOS和基于NAND闪存的移动设备的新的需求分页组件

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摘要

Similiar to a hard disk, NAND flash memory must be accessed in sector unit, and cannot be used for code storage without copying its contents to RAM. A virtual memory technique is promising as a RAM saving solution. However, it can not be easily used without the operating system supports, and it is not suitable for real time systems because it causes unpredicted execution delays. Virtual-ROM is a light-weight demand paging solution designed for RTOS based mobile devices. It is OS-independent, easy-to-use, and well optimized for NAND flash memory. Because it occupies only a restricted address space, real time tasks can be free from unpredictable execution delays by being excluded from Virtual-ROM. Our trace driven simulation showed that its performance is similar to 70ns NOR flash memory, and our real taget adaptation for a CDMA mobile phone showed that it saved about 30% RAM usage.
机译:与硬盘类似,NAND闪存必须以扇区为单位进行访问,并且必须将其内容复制到RAM才能用于代码存储。虚拟内存技术有望作为RAM节省解决方案。但是,在没有操作系统支持的情况下就很难使用它,并且由于它会导致意外的执行延迟,因此它不适用于实时系统。 Virtual-ROM是为基于RTOS的移动设备设计的轻量级需求分页解决方案。它与操作系统无关,易于使用,并且针对NAND闪存进行了优化。因为它只占用有限的地址空间,所以实时任务可以通过排除在Virtual-ROM中而避免不可预测的执行延迟。我们的跟踪驱动模拟表明,它的性能类似于70ns NOR闪存,而我们对CDMA手机的实际适应表明,它节省了约30%的RAM使用量。

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