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21. 发明授权

US5452418A Method of using stream buffer to perform operation under normal operation mode and selectively switching to test mode to check data integrity during system operation 失效
标题翻译：使用流缓冲器在正常操作模式下执行操作并选择性切换到测试模式以在系统操作期间检查数据完整性的方法
公开(公告)号：US5452418A
公开(公告)日：1995-09-19
申请号：US874071
申请日：1992-04-24
申请人： David A. Tatosian , Donald W. Smelser , Paul M. Goodwin
发明人： David A. Tatosian , Donald W. Smelser , Paul M. Goodwin
IPC分类号： G06F11/10 , G06F12/08 , G06F13/18 , G11C29/48 , G06F12/16
CPC分类号： G06F11/1008 , G06F11/1076 , G06F12/0862 , G06F13/18 , G11C29/48 , G06F2212/6022
摘要： The operation of a stream buffer varies depending on whether a normal operation mode or a test mode is selected. In the normal operation mode, the stream buffer is read from only when the data requested by a CPU read has been determined to reside there, and the stream buffer location read from is the location determined to contain the requested data. This determination is made by comparing the address of the read request with addresses of the data stored in the stream buffer. Also, the stream buffer is written with memory data in response to a read that misses the stream buffer, and the location written to is one that has been allocated to receive the incoming memory data. Two different buffer allocation methods are shown, first-in-first-out (FIFO) and least-recently-used (LRU). During the test operation mode, the stream buffer is written to and read from directly by the CPU at locations specified in the write and read requests, without regard to the data presence determination and the allocation that take place in the normal operation mode. The method provides a straightforward way of testing the stream buffer during system operation by bypassing some normal functions during test mode in favor of direct stream buffer access by the CPU.
摘要翻译：流缓冲区的操作取决于是否选择正常操作模式或测试模式。在正常操作模式下，只有当CPU读取的数据已经被确定为驻留在那里时才读取流缓冲器，并且读取的流缓冲器位置是被确定为包含所请求的数据的位置。通过将读取请求的地址与存储在流缓冲器中的数据的地址进行比较来进行该确定。此外，流缓冲器被写入存储器数据以响应于错过流缓冲器的读取，并且写入的位置是已被分配用于接收输入存储器数据的位置。显示两种不同的缓冲区分配方法，先进先出（FIFO）和最近最少使用（LRU）。在测试操作模式期间，流缓冲器被写入和写入请求中指定位置处的CPU直接读取，而不考虑在正常操作模式下发生的数据存在确定和分配。该方法提供了在系统操作期间通过在测试模式期间绕过某些正常功能，有利于CPU直接流缓冲访问来测试流缓冲区的简单方式。

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