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    • 33. 发明授权
    • Dynamic bus locking in a cross bar switch
    • 动态总线锁定在交叉开关中
    • US06323755B1
    • 2001-11-27
    • US09136023
    • 1998-08-19
    • William Robert LeeDavid Wallach
    • William Robert LeeDavid Wallach
    • H04M514
    • G06F13/4022
    • A cross-bar switch which includes a plurality of master bus ports, the master bus ports adapted to receive a plurality of master buses; a plurality of slave bus ports, the slave bus ports adapted to receive a plurality of slave buses; a switching mechanism for selectively coupling the plurality of master bus ports to the plurality of slave bus ports; and a configuration mechanism for locking at least one of the plurality of slave buses in response to a transfer request initiated by a master device attached to one of the plurality of master buses. The cross-bar switch has the capability of selectively locking slave buses during a bus lock transfer. In the preferred embodiment, the configuration mechanism is a Bus Lock Bit on Configuration Registers on the cross-bar switch. The Bus Lock Bit is programmable through the Device Control Register bus, which allows the cross-bar switch to be dynamically programmable and changed by a processor in a larger system. The cross-bar switch minimizes the cycle latency between data transfers. This improves the bandwidth and throughput on the on-chip bus.
    • 一种横杆开关,其包括多个主总线端口,所述主总线端口适于接收多个主总线; 多个从属总线端口,所述从属总线端口适于接收多个从属总线; 用于选择性地将多个主总线端口耦合到多个从属总线端口的切换机构; 以及用于响应于由附接到所述多个主总线之一的主设备发起的传送请求而锁定所述多个从属总线中的至少一个的配置机构。 交叉开关具有在总线锁传输期间选择性地锁定从站总线的能力。 在优选实施例中,配置机制是在横杆开关上的配置寄存器上的总线锁定位。 总线锁定位可通过器件控制寄存器总线进行编程,允许交叉开关由较大系统中的处理器动态编程和更改。 交叉开关最小化数据传输之间的周期延迟。 这样可以提高片上总线的带宽和吞吐量。