The upper layer is also known as the model device driver (MDD), and the lower layer is also known as the platform dependent driver (PDD).
上层通常被叫做模型设备驱动(MDD)，下层通常被叫做平台相关驱动(PDD)。
The virtio_driver structure defines the upper-level device driver, list of device IDs that the driver supports, a features table (dependent upon the device type), and a list of callback functions.
virtio_driver结构定义上层设备驱动程序、驱动程序支持的设备ID的列表、一个特性表单（取决于设备类型）和一个回调函数列表。
Local access to the JDBC driver library files (and dependent license files) based on your hub database system.
基于hub数据库系统对JDBC驱动程序库文件(及相关许可文件)的本地访问权限。
The system bandwidth of conventional voltage-control-mode motor driver circuits is limited by the intrinsic frequency of the load, and its phase lag is also load-dependent.
传统电压控制模式的电机驱动电路系统频率都受电机的本征频率制约，其相位延迟会随负载的变化而变化。
"Function driver" is a device of dependent file. Different card needs specific "function driver" which assures any card is same to API layer.
“函数驱动层”是一个硬件相关的文件，不同的采集卡需要不同的“函数驱动层”，它们保证不同的卡对api层的一致性。
"Function driver" is a device of dependent file. Different card needs specific "function driver" which assures any card is same to API layer.
“函数驱动层”是一个硬件相关的文件，不同的采集卡需要不同的“函数驱动层”，它们保证不同的卡对api层的一致性。
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