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1. 发明授权

US06170034A Hardware assisted mask read/write 失效
标题翻译：硬件辅助掩码读/写
公开(公告)号：US06170034A
公开(公告)日：2001-01-02
申请号：US09052854
申请日：1998-03-31
申请人： Graeme Weston-Lewis , David M. Springberg , Stephen D. Hanna
发明人： Graeme Weston-Lewis , David M. Springberg , Stephen D. Hanna
IPC分类号： G06F1200
CPC分类号： G06F3/0623 , G06F3/0655 , G06F3/0674
摘要： The present invention includes a method of transferring data when some of the data is masked. A mask table is provided to a storage device where it is duplicated and stored with the duplicate. The duplicate data is compared to the original data for a data protection function. A mask index counter and mask bit counter maintain provide values for specific data that are to be processed. The counters are programmable so that if a transfer error occurs, counter values for the next data after the previously transferred good data is calculated and loaded therein. The present invention also has the capability not to transfer the last requested sector if that sector is masked. The present invention evaluates whether a stop count value equals a stop threshold value when a sector is identified as being masked. The stop count value is incremented for each sector that is read from the first storage device, regardless of whether that sector is to be transferred or masked. The stop threshold value is the total number of sectors to be transferred. If the stop count value equals the stop threshold value and the sector is masked (or not), a flag is generated to stop the transfer of that last masked sector.
摘要翻译：本发明包括当一些数据被屏蔽时传送数据的方法。掩模台被提供给存储设备，在该存储设备中它被复制并与副本一起存储。将重复数据与数据保护功能的原始数据进行比较。掩码索引计数器和掩码位计数器维护为要处理的特定数据提供值。计数器是可编程的，以便如果发生传输错误，则计算并加载先前传输好的数据之后的下一个数据的计数器值。如果该扇区被屏蔽，本发明还具有不传送最后请求扇区的能力。本发明评估当扇区被识别为被屏蔽时，停止计数值是否等于停止阈值。对于从第一存储设备读取的每个扇区，停止计数值递增，而不管该扇区是传输还是被屏蔽。停止阈值是要传送的扇区总数。如果停止计数值等于停止阈值并且扇区被屏蔽（否则），则生成标志以停止该最后一个屏蔽扇区的传送。

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