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1. 发明授权

US06349375B1 Compression of data in read only storage and embedded systems 失效
标题翻译：在只读存储和嵌入式系统中压缩数据
公开(公告)号：US06349375B1
公开(公告)日：2002-02-19
申请号：US09309061
申请日：1999-05-10
申请人： David Vincent Faulkner , Stephen Jay Klein , Bruce Eric Mann , Tavit K. Ohanian , Thomas Courtenay Porcher , Philip John Trasatti
发明人： David Vincent Faulkner , Stephen Jay Klein , Bruce Eric Mann , Tavit K. Ohanian , Thomas Courtenay Porcher , Philip John Trasatti
IPC分类号： G06F926
CPC分类号： G06F12/08 , G06F2212/401
摘要： This disclosure involves the combination of data compression and decompression with a virtual memory system. A number of computer systems are discussed, including so-called embedded systems, in which data is stored in a storage device in a compressed format. In response to a request for data by a central processing unit (CPU), the virtual memory system will first determine if the requested data is present in the portion of main memory that is accessible to the CPU, which also happens to be where decompressed data is stored. If the requested data is not present in the decompressed portion of main memory, but rather is present in a compressed format in the storage device, the data will be transferred into the decompressed portion of main memory through a demand paging operation. During the demand paging operation, the compressed data will be decompressed. Likewise, if data is paged out of the decompressed portion of main memory, and that data must be saved, it can also be compressed before storage in the storage device for compressed data.
摘要翻译：本公开涉及数据压缩和解压缩与虚拟存储器系统的组合。讨论了许多计算机系统，包括所谓的嵌入式系统，其中数据以压缩格式存储在存储设备中。响应于中央处理单元（CPU）对数据的请求，虚拟存储器系统将首先确定所请求的数据是否存在于CPU可访问的主存储器部分中，这也恰好是解压缩数据被存储。如果请求的数据不存在于主存储器的解压缩部分中，而是以存储设备中的压缩格式存在，则数据将通过请求寻呼操作被传送到主存储器的解压缩部分。在请求寻呼操作期间，压缩数据将被解压缩。同样，如果数据从主存储器的解压缩部分中分页出来，并且数据必须被保存，那么也可以在存储设备中压缩数据之前对其进行压缩。

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