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上讲对VXI总线器件的分类、组态寄存器的构成、器件的初始化与自检等作了介绍,这一讲对VXI总线定义的四类器件作进一步说明。一、基于寄存器的器件基于寄存器的器件是VXI总线器件中最简单的一种,一般只具有VME总线的从功能模块能力。与这种器件通讯通常是通过对它的寄存器进行读写操作来实现的。多路继电器转换开关是这种器件的一个例子,可以通过对一个特定寄存器的写操作使开关动作。基于寄存器的器件一般不要求使用VME总线的优先中断,但某些这类器件可以使用中断来报告它们的状态,即在响应中断允许周期时发送STATUS/ID字。基于寄存器的器件具有VXI总线器件标准的组态寄存器和与器件相关的操作寄存器,这些寄存器的数量以及所在地址空间的位置由器
On the classification of VXI bus devices, the configuration of the configuration registers, device initialization and self-test were introduced, this on the VXI bus definition of four types of devices for further instructions. A register-based device Register-based devices are the most simple type of VXI bus devices, generally only with the VME bus from the functional module capabilities. Communication with this device is usually done by reading and writing its registers. An example of such a device is a multiplexed relay transfer switch that can be activated by a write to a particular register. Register-based devices generally do not require prioritized interrupts using the VME bus, but some such devices can use interrupts to report their status by sending the STATUS / ID word in response to the interrupt enable period. The register-based device has the VXI bus standard configuration registers and device-related operating registers, the number of these registers and the location of the address space