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公开(公告)号:US08521982B2
公开(公告)日:2013-08-27
申请号:US12424207
申请日:2009-04-15
申请人: Robert A. Cargnoni , Guy L. Guthrie , Thomas L. Jeremiah , Stephen J. Powell , William J. Starke , Jeffrey A. Steucheli
发明人: Robert A. Cargnoni , Guy L. Guthrie , Thomas L. Jeremiah , Stephen J. Powell , William J. Starke , Jeffrey A. Steucheli
IPC分类号: G06F12/00
CPC分类号: G06F12/123 , G06F12/084 , G06F12/0897
摘要: A system and method for tracking core load requests and providing arbitration and ordering of requests. When a core interface unit (CIU) receives a load operation from the processor core, a new entry in allocated in a queue of the CIU. In response to allocating the new entry in the queue, the CIU detects contention between the load request and another memory access request. In response to detecting contention, the load request may be suspended until the contention is resolved. Received load requests may be stored in the queue and tracked using a least recently used (LRU) mechanism. The load request may then be processed when the load request resides in a least recently used entry in the load request queue. CIU may also suspend issuing an instruction unless a read claim (RC) machine is available. In another embodiment, CIU may issue stored load requests in a specific priority order.
摘要翻译: 用于跟踪核心负载请求并提供仲裁和请求排序的系统和方法。 当核心接口单元(CIU)从处理器核心接收到加载操作时,分配在CIU队列中的新条目。 响应于在队列中分配新条目,CIU检测加载请求和另一个存储器访问请求之间的争用。 响应于检测到争用,负载请求可以被暂停,直到争用被解决。 接收到的加载请求可以存储在队列中,并使用最近最少使用的(LRU)机制进行跟踪。 然后可以在加载请求驻留在加载请求队列中最近最少使用的条目中时处理加载请求。 除非读取权利要求(RC)机器可用,否则CIU也可以暂停发出指令。 在另一个实施例中,CIU可以以特定优先级顺序发布存储的加载请求。