PXIe-8861  可用于处理器密集型RF、模块化仪器

PXIe，2.8 GHz四核PXI控制器

PXIe‑8861是用于PXI Express系统的Intel Xeon四核嵌入式控制器，‑ 可用于处理器密集型RF、模块化仪器和数据采集应用。 PXIe‑8861包含两个10/100/1000BASE‑TX（千兆）以太网端口、两个USB 3.0端口、四个USB 2.0端口，以及集成的硬盘驱动器、串行端口、两个Thunderbolt™3端口以及其他外围I/O。

PXIe-8861控制器（英文名称：controller）是指按照预定顺序改变主电路或控制电路的接线和改变电路中电阻值来控制电动机的启动、调速、制动和反向的主令装置。由程序计数器、指令寄存器、指令译码器、时序产生器和操作控制器组成，它是发布命令的“决策机构”，即完成协调和指挥整个计算机系统的操作。

PXIe-8861 控制器分组合逻辑控制器和微程序控制器，两种控制器各有长处和短处。组合逻辑控制器设计麻烦，结构复杂，一旦设计完成，就不能再修改或扩充，但它的速度快。微程序控制器设计方便，结构简单，修改或扩充都方便，修改一条机器指令的功能，只需重编所对应的微程序；要增加一条机器指令，只需在控制存储器中增加一段微程序，但是，它是通过执行一段微程。具体对比如下：

组合逻辑控制器又称硬布线控制器，由逻辑电路构成，完全靠硬件来实现指令的功能。

微程序控制器基本工作原理：根据指令操作码地址（由指令操作码部分直接给出或通过译码器）去读取控制存储器中对应的微程序段（一个微程序段对应一条机器指令的功能），然后按照“由控制存储器读出的控制信号”来驱动相应的硬件完成指令的功能。

在计算机网络中，PXIe-8861控制器主要用于控制和管理网络设备，例如路由器、交换机等。在这些设备中，控制器负责处理来自不同网络接口的数据包，并根据网络协议将它们转发到正确的目的地。同时，控制器还负责管理设备的配置和状态信息，以及提供对网络设备的远程管理和监控功能。

此外，PXIe-8861在工业自动化领域，控制器也扮演着重要的角色。例如可编程逻辑控制器（PLC）就是用于控制和监视工业自动化设备和系统的重要组件。它们通过读取传感器和执行器的输入信号来控制机械、电气和液压系统等不同类型的设备，从而实现自动化生产流程的控制和监控。

总的来说，PXIe-8861控制器的种类和功能多种多样，可以根据不同的应用场景和需求进行设计和选择。

PXIe-8861  可用于处理器密集型RF、模块化仪器

PXIe, 2.8GHz quad-core PXI controller

PXIe‑8861 is an Intel Xeon quad-core embedded controller for PXI Express systems, ‑ for processor-intensive RF, modular instrumentation and data acquisition applications. The PXIe‑8861 includes two 10/100/1000BASE-TX (Gigabit) Ethernet ports, two USB 3.0 ports, four USB 2.0 ports, as well as an integrated hard drive, serial ports, two Thunderbolt™3 ports, and other peripheral I/O.

PXIe-8861 controller (English name: controller) is a master device that changes the wiring of the main circuit or control circuit and changes the resistance value in the circuit to control the start, speed regulation, braking and reverse of the motor in accordance with the predetermined sequence. Composed of program counter, instruction register, instruction decoder, timing generator and operation controller, it is a "decision mechanism" that issues commands, that is, to complete the coordination and command of the operation of the entire computer system.

PXIe-8861 controller is divided into combinational logic controller and microprogram controller, both of which have their strengths and weaknesses. Combinatorial logic controller design is troublesome, complex structure, once the design is completed, it can not be modified or expanded, but its speed is fast. Microprogram controller is convenient in design, simple in structure, easy to modify or expand, modify the function of a machine instruction, only need to reprogram the corresponding microprogram; To add a machine instruction, one simply adds a microprogram to the control memory, but it does so by executing a microprogram. The specific comparison is as follows:

The combinational logic controller, also known as the hard-wired controller, is composed of logic circuits and completely relies on hardware to achieve the function of instructions.

The basic working principle of the microprogram controller: according to the instruction opcode address (directly given by the instruction opcode part or through the decoder) to read the corresponding microprogram segment in the control memory (a microprogram segment corresponds to the function of a machine instruction), and then drive the corresponding hardware to complete the function of the instruction in accordance with the "control signal read by the control memory".

In computer networks, the PXIe-8861 controller is mainly used to control and manage network equipment, such as routers, switches, etc. In these devices, the controller is responsible for processing packets from different network interfaces and forwarding them to the correct destination according to network protocols. At the same time, the controller is also responsible for managing device configuration and status information, as well as providing remote management and monitoring functions for network devices.

In addition, the PXIe-8861 controller also plays an important role in the field of industrial automation. For example, programmable logic controllers (PLCS) are important components used to control and monitor industrial automation equipment and systems. They control different types of equipment such as mechanical, electrical and hydraulic systems by reading input signals from sensors and actuators, enabling the control and monitoring of automated production processes.

In general, the PXIe-8861 controller has a variety of types and functions, which can be designed and selected according to different application scenarios and needs.