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    • 5. 发明授权
    • Method of and circuit for instruction/data prefetching using non-referenced prefetch cache
    • 使用非引用预取缓存的指令/数据预取方法和电路
    • US06272622B1
    • 2001-08-07
    • US08522222
    • 1995-09-01
    • Tack-Don HanGi-Ho ParkShin-Dug Kim
    • Tack-Don HanGi-Ho ParkShin-Dug Kim
    • G06F900
    • G06F12/0862G06F2212/6022
    • A method of and a circuit for instruction/data prefetching using a non-referenced prefetch cache, adapted to store instruction/data blocks prefetched in accordance with a variety of existing prefetchinig machanisms, but not referenced by the central processing unit in an on-chip memory as the non-referenced prefetch cache without discarding them when they are replaced by new ones in a prefetch buffer so that a direct memory reference to the non-referenced prefetch instruction/data blocks can be achieved when they are to be referenced at later times, without any requirement of fetching or prefetching them from the lower memory again. Accordingly, it is possible to not only decrease the number of cache misses and the memory latency due to the fetching of instructions/data from the lower memory for the reference to the instructions/data, but also to reduce memory traffic.
    • 一种用于使用非参考预取高速缓存的指令/数据预取的方法和电路,其适于存储根据各种现有的预读取机制预取的指令/数据块,但不由片上的中央处理单元引用 存储器作为非引用的预取缓存,而在预取缓冲器中被替换为新引用的预取缓存时,它们不会丢弃它们,以便在稍后引用时可以实现对非引用的预取指令/数据块的直接存储器引用 ,而不需要再次从下层存储器中取出或预取它们。 因此,不仅可以减少高速缓存未命中的数量和由于从较低的存储器获取用于引用指令/数据的指令/数据引起的存储器等待时间,还可以减少存储器流量。
    • 6. 发明申请
    • Branch target buffer, a branch prediction circuit and method thereof
    • 分支目标缓冲器,分支预测电路及其方法
    • US20070192574A1
    • 2007-08-16
    • US11700780
    • 2007-02-01
    • Gi-Ho Park
    • Gi-Ho Park
    • G06F9/00
    • G06F9/3806G06F1/32G06F9/3814
    • A branch target buffer, a branch prediction circuit and a method thereof are provided. The example branch target buffer may include a memory cell array storing a branch address and a target address, a decoder connected to the memory cell array through a word line, and providing a word line voltage to a selected word line in response to a fetch address, a sense amp connected to the memory cell array through a bit line and sensing and amplifying data of a selected memory cell and sense amp enable circuitry connected to the word line, the sense amp enable circuitry storing branch prediction information and controlling an operation of the sense amp based on the branch prediction information. The example method may be directed to a method of operating a branch target buffer, including determining whether an instruction to be executed by a processor is a branch instruction, determining, if the instruction is determined to be a branch instruction, whether the branch instruction is predicted to be taken and selectively buffering instructions, from one or more memory cells, associated with the branch instruction based on whether the branch instruction is predicted to be taken.
    • 提供了分支目标缓冲器,分支预测电路及其方法。 示例性分支目标缓冲器可以包括存储分支地址和目标地址的存储单元阵列,通过字线连接到存储单元阵列的解码器,以及响应于提取地址向选定字线提供字线电压 ,通过位线连接到存储单元阵列的感测放大器,感测和放大所选存储单元的数据和连接到字线的感测放大器使能电路,读出放大器使能电路存储分支预测信息并控制 基于分支预测信息的感测放大器。 该示例方法可以涉及一种操作分支目标缓冲器的方法,包括确定由处理器执行的指令是否是分支指令,确定该指令是否为分支指令,分支指令是否为 预测将基于是否预测分支指令被采取并选择性地缓冲与分支指令相关联的一个或多个存储器单元的指令。