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    • 28. 发明授权
    • Method and system for reducing memory access latency by providing fine
grain direct access to flash memory concurrent with a block transfer
therefrom
    • 通过向其提供细粒度直接存取与其块传输并发的方法和系统来减少存储器访问等待时间
    • US5802554A
    • 1998-09-01
    • US813011
    • 1997-03-05
    • Ramon CaceresBrian BershadBrian D. MarshFrederick Douglis
    • Ramon CaceresBrian BershadBrian D. MarshFrederick Douglis
    • G06F12/02G06F12/00G06F12/06G06F12/08
    • G06F12/08G06F12/0638G06F2212/2022
    • A system and method for reducing access latency to stable storage are described. A technique referred to as fault trickling is used to improve access latency to stable storage such as flash memory. In particular, data requests from a central processing unit are preferentially satisfied by a memory management unit providing access to a main memory. When the requested data does not reside in the main memory, however, the memory management unit satisfies the request by providing direct fine-grain access to the flash memory. In addition, concurrently with satisfying the data request directly from the flash memory, a block transfer is initiated from the flash memory to the main memory. Once the block transfer is completed, a memory map, such as an address translation table, is updated to indicate that the data now resides in the more convenient source of data--the main memory. Accordingly, subsequent data requests, for that or proximately located data, can be satisfied by accessing the main memory.
    • 描述用于减少对稳定存储的访问延迟的系统和方法。 被称为故障滴流的技术被用于改善诸如闪存之类的稳定存储的访问延迟。 特别地,来自中央处理单元的数据请求优先地由提供对主存储器的访问的存储器管理单元来满足。 然而,当请求的数据不在主存储器中时,存储器管理单元通过向闪存提供直接的细粒度访问来满足该请求。 另外,与从闪速存储器直接满足数据请求同时,从闪速存储器向主存储器发起块传送。 一旦块传输完成,更新存储器映射,例如地址转换表,以指示数据现在位于更方便的数据源 - 主存储器中。 因此,可以通过访问主存储器来满足针对该位置或近似位置的数据的后续数据请求。