The USB Bus device driver takes charge of control and communicates with hardware.
USB总线驱动程序负责控制实际的硬件，实现与底层的通信。
USB Function device driver is designed by client, it lies the up layer of USB Bus device driver, it sends and receives information from USB device by send URB to USB Bus device driver.
USB功能驱动程序由设备开发者编写，位于USB总线驱动程序的上层，通过向USB总线驱动程序发送USB请求包，来实现对USB设备信息的发送或接收。
Each controller on a bus can be individually addressed by the CPU, this is why the software device driver can write to its registers and thus control it.
在总线上的每个控制器可以被CPU所单独寻址，这是软件设备驱动程序能写入寄存器并能控制这些控制器的原因。
This scheme includes three parts: PCI Bus interface board, experiment flat board and device driver high-level software.
该设计方案由PCI总线接口板、实验平台板、设备驱动程序及上层软件三个部分组成。
PDO stands for physical device object. The bus driver USES this object to represent the connection between the device and the bus.
PDO代表的物理设备对象。总线驱动使用这个对象来描绘介于设备和总线之间的连结。
This scheme includes three parts: PCI Bus interface board, experimental platform device driver and high-level software.
该设计方案由PCI总线接口板、实验平台板、设备驱动程序及上层应用软件三个部分组成。
To analyse the configuration process between OS protocol driver and USB bus device and the matching process between driver and the correspond device function interface.
分析出系统协议栈与USB总线设备的配置交互过程以及设备驱动程序与设备对应接口的匹配过程。
From bottom to top, the system is plotted out bus driver layer, device function driver layer, communication layer and user-interface. Each layer provides service to the layer above by interface style.
由下往上将整个驱动软件系统分为总线驱动层、设备功能驱动层、通信层和用户界面等层次，每一层都以接口的形式为上层提供服务。
We present the architecture of PCI bus, the function of each PCI device, the design flow and implementation of PCI device driver on the SCA embedded platform.
介绍了该平台的PCI总线结构、各pci设备的功能及其驱动程序的设计流程和实现过程。
The bus driver uses this object to represent the connection between the device and the bus.
总线驱动使用这个对象来描绘介于设备和总线之间的连结。
If there is no PCLTA-20 card currently installed in a PCI-bus slot, a message appears stating that the operating system has removed, or has not loaded, the PCLTA-20 device driver.
如果没有PCLTA - 20卡插槽，目前安装在一个PCI总线，将出现一条消息，说明该操作系统已去除，或没有加载，PCLTA - 20设备驱动程序。
If there is no PCLTA-20 card currently installed in a PCI-bus slot, a message appears stating that the operating system has removed, or has not loaded, the PCLTA-20 device driver.
如果没有PCLTA - 20卡插槽，目前安装在一个PCI总线，将出现一条消息，说明该操作系统已去除，或没有加载，PCLTA - 20设备驱动程序。
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