公开(公告)号：KR1020080067108A

公开(公告)日：2008-07-18

申请号：KR1020070004286

申请日：2007-01-15

Applicant: 재단법인서울대학교산학협력재단

Inventor： 정준목 ,  김지홍

IPC: G06F12/08 ,  G06F13/40 ,  G06F12/00

CPC classification number: Y02D10/13 ,  Y02D10/14 ,  Y02D10/151

Abstract: A device and a method for reducing power for cache consistency operation in shared bus-based MPSOCs(MultiProcessor System-On-Chip) by filtering useless broadcasts are provided to reduce power needed for the cache consistency operation by referring to the data sharing status of caches before a cache consistency request is broadcasted. A snooping cache(460) stores a sharing status of cached data, and filters a cache consistency request for the data not shared by remote L1 caches(420) when the cache consistency request is received. A multi-split bus comprises bus fragments(430) and a bus splitter(440), and transfers the cache consistency request selectively to only the remote cache storing the shared status of the cached data, and sharing the data shared with the remote caches when the cache consistency request is received. Power consumption for cache consistency operation is reduced by filtering the cache consistency request if a need for broadcasting the cache consistency request to all remote caches is not found when the cache consistency operation is needed as the data is needed or changed by a memory(470).

Abstract translation: 提供了一种用于通过过滤无用广播来降低基于共享总线的MPSOC（多处理器片上系统）中高速缓存一致性操作的功能的设备和方法，以通过参考缓存的数据共享状态来减少高速缓存一致性操作所需的功率 在广播缓存一致性请求之前。 侦听高速缓存（460）存储缓存数据的共享状态，并且当接收到高速缓存一致性请求时，过滤对远程L1高速缓存（420）未共享的数据的高速缓存一致性请求。 多分割总线包括总线分段（430）和总线分离器（440），并且将高速缓存一致性请求选择性地仅传送到存储缓存数据的共享状态的远程高速缓存，并且共享与远程高速缓存共享的数据时 接收缓存一致性请求。 通过过滤高速缓存一致性请求，如果在需要缓存一致性操作需要缓冲存储器一致性操作时，由于存储器需要或改变数据（470），缓存一致性操作的功耗将被减少， 。