服务器上有两个主机总线适配器 (HBAs)、RAID 阵列上有两个 SAN 交换机和两个 RAID 控制器。
There are two host bus adapters (HBAs) on the server, two SAN switches, and two RAID controllers on the RAID array.
主机对总线有最高的控制权，在任何时候通过将时钟线拉低就可以禁止通信。
The host has ultimate control over the bus and may inhibit communication at any time by pulling the Clock line low.
USB技术在嵌入式系统中有两种主要的应用方式：即作为USB总线设备的USB设备方式和作为USB主控制器的嵌入式USB主机。
There are generally two modes of USB technology could be used in embedded systems, one is the USB device mode using as USB Devices and the other is USB host mode using as USB Host Controllers.
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