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    • 1. 发明授权
    • Method and apparatus for reducing propagation latency in a high speed
crossbar switch
    • 降低高速交叉开关中传播延迟的方法和装置
    • US5896516A
    • 1999-04-20
    • US885821
    • 1997-06-30
    • Lawrence Joseph Powell, Jr.Krishnamurthy Venkatramani
    • Lawrence Joseph Powell, Jr.Krishnamurthy Venkatramani
    • G06F13/362G06F13/40G06F13/00
    • G06F13/4022
    • A protocol and apparatus for crossbar switches where the cycle time is too short to allow the updating of the input/output buffer controls by the arbitration logic in one cycle. The crossbar switch has separate data paths and commands paths. Two types of commands are sent over the crossbar switches. The first type is an address (A) only command which consist of a single packet needing one clock cycle. The second type of command is an Address with Data command (AD), consisting of two through nine packets, and requiring a maximum of nine clock cycles. A command becomes a request through two different paths through the crossbar switch. The first path is via an input bypass path which allows an input command buffer to be bypassed and a request written directly to a multiplexer. The second path is through the input command buffer which is written but not selected until processing is completed for the previous command. The crossbar protocol allows a request to be accepted by writing information into the output buffers before the accept is available.
    • 一种用于交叉开关的协议和装置,其中周期时间太短,从而不能在一个周期内由仲裁逻辑更新输入/输出缓冲器控制。 交叉开关具有单独的数据路径和命令路径。 两种类型的命令通过交叉开关发送。 第一种类型是仅需要一个时钟周期的单个数据包的地址(A)命令。 第二种类型的命令是一个地址数据命令(AD),由两个到九个数据包组成,最多需要九个时钟周期。 命令通过交叉开关的两个不同路径成为一个请求。 第一条路径是通过输入旁路路径,允许输入命令缓冲器被旁路,并将请求直接写入多路复用器。 第二条路径是通过输入命令缓冲区,该缓冲区被写入但不被选择,直到前一个命令的处理完成为止。 交叉开关协议允许在接受可用之前将信息写入输出缓冲器来接受请求。