VMIVME-2540-200  智能计数器/控制器(ICC)

型号：VMIVME-2540-200

产品概述-VMIVME-2540-200智能计数器/控制器(ICC)是一个VME总线从I0模块，旨在为VME总线系统提供高精度的数字测量和函数生成能力，具有简单、一致的内存映射用户界面。VMIVME-2540-200支持以下功能:

测量功能

事件计数

频率测量

周期/脉冲宽度测量

正交位置测量

生成函数

脉冲列/方波产生

定时器/周期性中断产生

分频

正交位置控制

技术说明VMIVME-2540-200由三部分组成:VMEbus从DTB接口，用于仲裁本地CPU资源;CPU具有固件和支持逻辑。

ICC计数器电路由六个可编程系统时序控制器(STCS)组成。每个STC提供了四个高速计数器/波形合成接口的ICC，使VMIVME-2540 24通道的数字测量和控制。STC计数器可以单独配置，也可以最多四个一组配置，以实现各种测量和控制功能。板载68HC000CPU直接配置和管理每个STC接口，使VMEbus主机接口提升到硬件级别之上。订购选项允许VMIVME-2540出厂时配置1，2,4、或6个系统定时控制器。系统时序控制器的输入和输出在带有RS-422线路接收器和线路驱动器的前面板连接器上进行缓冲。通过将RS-422线路接收器的反相输入端通过前面板连接到板上1.4 V基准电压源，并将TTL信号连接到同相输入端，支持TTL输入信号兼容性。

智能计数器/控制器的用户界面是由一个15 MHz的68HC000 CPU支持的EPROM固件，128K字节的零等待状态静态RAM和高度集成的控制和中断逻辑。VMEbus主机通过在本地内存中排队功能控制块并发出命令来对ICC进行编程。CPU通过解释功能控制块来响应命令，配置系统时序控制器，然后确认主机命令。一旦配置完成，CPU将在本地存储器中维护测量数据的数据结构，并在测量或控制过程完成时中断VME总线主机。

Model: VMIVME-2540-200

The VMIVME-2540-200 Intelligent Counter/Controller (ICC) is a VME bus slave I0 module designed to provide high-precision digital measurement and function generation capabilities for VME bus systems with a simple, consistent memory-mapped user interface. The VMIVME-2540-200 supports the following functions:

Measuring function

Event count

Frequency measurement

Period/pulse width measurement

Orthogonal position measurement

Generating function

Pulse train/square wave generation

The timer/periodic interrupt is generated. Procedure

Frequency division

Orthogonal position control

Technical Description The VMIVME-2540-200 consists of three parts: The VMEbus secondary DTB interface for arbitrating local CPU resources; The CPU has firmware and support logic.

The ICC counter circuit consists of six programmable system timing controllers (STCS). Each STC offers four high-speed counter/waveform synthesis interfaces to the ICC, enabling 24-channel digital measurement and control of the VMIVME-2540. STC counters can be configured individually or in groups of up to four to enable a variety of measurement and control functions. The onboard 68HC000CPU directly configurates and manages each STC interface, elevating the VMEbus host interface above the hardware level. Ordering options allow the VMIVME-2540 to be shipped with 1,2,4, or 6 system timing controllers. The inputs and outputs of the system timing controller are buffered on a front panel connector with an RS-422 line receiver and line driver. TTL input signal compatibility is supported by connecting the inverting input of the RS-422 line receiver to the 1.4V reference voltage source on the board through the front panel and the TTL signal to the in-phase input.

The user interface of the smart counter/controller is EPROM firmware supported by a 15 MHz 68HC000 CPU, 128K bytes of zero wait state static RAM and highly integrated control and interrupt logic. The VMEbus host programs the ICC by queueing functional control blocks in local memory and issuing commands. The CPU responds to commands by interpreting functional control blocks, configuring the system timing controller, and then acknowledging host commands. Once configured, the CPU maintains the data structure of the measurement data in local memory and interrupts the VME bus host when the measurement or control process is complete.