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    • 21. 发明授权
    • Second level cache controller unit and system
    • 二级缓存控制器单元和系统
    • US5355467A
    • 1994-10-11
    • US208090
    • 1994-03-08
    • Peter D. MacWilliamsRobert L. FarrellAdalberto GolbertItzik Silas
    • Peter D. MacWilliamsRobert L. FarrellAdalberto GolbertItzik Silas
    • G06F12/08G06F13/00
    • G06F12/0811G06F12/0831G06F2212/6082
    • A second level cache memory controller, implemented as an integrated circuit unit, operates in conjunction with a secondary random access cache memory and a main memory (system) bus controller to form a second level cache memory subsystem. The subsystem is interfaced to the local processor (CPU) bus and to the main memory bus providing independent access by both buses, thereby reducing traffic of the main memory bus when the data required by the CPU is located in secondary cache. Similarly, CPU bus traffic is minimized when secondary cache access by the main memory bus for snoops and write-backs to main memory. Snoop latches interfaced with the main memory bus provide snoop access to the cache memory via the cache directory in the secondary cache controller unit. The controller also supports parallel look-up in the controller tag array and the secondary cache using most-recently-used (MRU) main memory write-through and pipelining of memory bus cycle requests.
    • 实现为集成电路单元的第二级高速缓冲存储器控制器与辅助随机存取高速缓冲存储器和主存储器(系统)总线控制器一起操作以形成第二级高速缓存存储器子系统。 该子系统与本地处理器(CPU)总线和主存储器总线接口,由总线提供独立的访问,从而当CPU所需的数据位于二级缓存中时,减少主存储器总线的流量。 类似地,当主存储器总线的二级缓存访问被窃听并回写到主存储器时,CPU总线流量被最小化。 与主存储器总线连接的监听锁存器通过次级高速缓存控制器单元中的高速缓存目录提供对高速缓冲存储器的窥探访问。 控制器还支持使用最近使用(MRU)主存储器直写和流水线存储器总线周期请求的控制器标签阵列和二级缓存中的并行查找。