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    • 6. 发明授权
    • Multiprocessor cache system having three states for generating
invalidating signals upon write accesses
    • 具有三种状态的多处理器缓存系统,用于在写访问时产生无效信号
    • US5283886A
    • 1994-02-01
    • US950746
    • 1992-09-24
    • Osamu NishiiKunio UchiyamaHirokazu AokiKanji OishiJun KitanoSusumu Hatano
    • Osamu NishiiKunio UchiyamaHirokazu AokiKanji OishiJun KitanoSusumu Hatano
    • G06F12/08G06F12/12
    • G06F12/0833
    • Herein disclosed is a multiprocessor system which comprises first and second processors (1001 and 1002), first and second cache memories (100:#1 and #2), an address bus (123), a data bus (126), an invalidating signal line (PURGE:131) and a main memory (1004). The first and second cache memories are operated by the copy-back method. The state of the data of the first cache (100:#1) exists in one state selected from a group consisting of an invalid first state, a valid and non-updated second state and a valid and updated third state. The second cache (100:#2) is constructed like the first cache. When the write access of the first processor hits the first cache, the state of the data of the first cache is shifted from the second state to the third state, and the first cache outputs the address of the write hit and the invalidating signal to the address bus and the invalidating signal line, respectively. When the write access from the first processor misses the first cache, a data of one block is block-transferred from the main memory to the first cache, and the invalidating signal is outputted. After this, the first cache executes the write of the data in the transfer block. In case the first and second caches hold the data in the third state relating to the pertinent address when an address of an access request is fed to the address bus (123), the pertinent cache writes back the pertinent data in the main memory.
    • 这里公开了一种多处理器系统,其包括第一和第二处理器(1001和1002),第一和第二高速缓冲存储器(100:#1和#2),地址总线(123),数据总线(126),无效信号 线(PURGE:131)和主存储器(1004)。 第一和第二高速缓存存储器通过复制方法操作。 第一高速缓存(100:#1)的数据的状态存在于从由无效的第一状态,有效和未更新的第二状态以及有效和更新的第三状态组成的组中选择的一个状态中。 第二个缓存(100:#2)被构造成像第一个缓存。 当第一处理器的写入访问第一高速缓存时,第一高速缓存的数据的状态从第二状态转移到第三状态,并且第一高速缓存将写入命中的地址和无效信号输出到 地址总线和无效信号线。 当来自第一处理器的写访问错过第一高速缓存时,一个块的数据被从主存储器块传输到第一高速缓存,并且输出无效信号。 之后,第一个缓存执行传输块中数据的写入。 在第一和第二高速缓冲存储器将存取请求地址与相关地址相关的第三状态的数据保存到地址总线(123)的情况下,相关高速缓冲存储器将相关数据写回到主存储器中。