特定的内存位置和数据值必须被写入由主机的总线管理器选择，不可能仅仅是一个任意值。
The particular memory location and data value that must be written are selected by the host's bus manager, it can't just be any an arbitrary value.
数据传送操作是通过CRC编码来保护的，因此，由拔插卡引起的任何位的变动将会被SD总线管理器侦测到。
Data transfer operations are protected by CRC codes; therefore, any bit changes induced by card insertion and removal can be detected by the SD bus master.
该总线桥是某型协调控制器系统的通讯核心，实现了系统下层的背板总线、背板总线管理器与上位机epp并口之间的协议转换以及通讯仲裁功能。
This bridge is the core of communication of the controller system, it connects the bottom level backplane bus, backplane bus controller, and PC EPP parallel port.
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