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    • 12. 发明公开
    • Cache with selective write allocation
    • 缓存缓存器
    • EP1304620A1
    • 2003-04-23
    • EP01402685.0
    • 2001-10-17
    • Texas Instruments IncorporatedTexas Instruments France S.A.
    • Chauvel, Gérard Résidence du Valbosquet 20Kuusela, Maijad'Inverno, Dominique Chemin des Basses
    • G06F12/08
    • G06F12/0888G06F12/0804Y02D10/13
    • A digital system and method of operation is provided in which several processors (590n) are connected to a shared cache memory resource (500). A translation lookaside buffer (TLB) (310n) is connected to receive a request virtual address from each respective processor. A set of address regions (pages) is defined within an address space of a back-up memory associated with the cache and write allocation in the cache is defined on a page basis. Each TLB has a set of entries that correspond to pages of address space and each entry provides a write allocate attribute (550) for the associated page of address space. During operation of the system, software programs are executed and memory transactions are performed. A write allocate attribute signal (550) is provided with each write transaction request. In this manner, the attribute signal is responsive to the value of the write allocation attribute bit assigned to an address region that includes the address of the write transaction request. Write allocation in the cache memory is performed generally in accordance with the write allocate attribute signal. However, write allocation policy circuitry (560) is also provided and operates to refine the operation of the write allocation. Thus, the cache memory is responsive to the write policy circuitry such that write allocation is performed in a selective manner in accordance to the attribute signal for a first write policy state and write allocation is always performed. in accordance to the attribute signal for a second write policy state.
    • 提供了数字系统和操作方法,其中多个处理器(590n)连接到共享高速缓冲存储器资源(500)。 连接翻译后备缓冲器(TLB)(310n)以从每个相应的处理器接收请求虚拟地址。 在与高速缓存相关联的备份存储器的地址空间内定义一组地址区(页),并且以页为基础定义高速缓存中的写分配。 每个TLB具有对应于地址空间的页面的一组条目,并且每个条目为相关联的地址空间页面提供写入分配属性(550)。 在系统操作期间,执行软件程序并执行内存事务。 写入分配属性信号(550)被提供有每个写事务请求。 以这种方式,属性信号响应于分配给包括写事务请求的地址的地址区的写分配属性位的值。 通常根据写入分配属性信号来执行高速缓冲存储器中的写入分配。 然而,还提供写分配策略电路(560)并且操作以改进写分配的操作。 因此,高速缓冲存储器响应于写策略电路,使得根据用于第一写策略状态的属性信号以选择性的方式执行写分配,并且总是执行写分配。 根据第二写策略状态的属性信号。