BENTLY 106M1081-01位移监测器
初始化IBC中的PIRQx（PCI中断）路由控制寄存器（PCI/ISA总线桥控制器）。ENV参数是一个32位值，该值除以4得到路由控制寄存器PIRQ0/1/2/3的值。默认值由系统类型决定。有关PCI/ISA中断的详细信息赋值和有关为此参数输入的建议值，请参阅8259中断MVME2600/2700系列单板中的部分计算机程序员参考指南。
BENTLY 106M1081-01位移监测器配置VMEbus接口ENV提出了以下一系列问题来设置VMEbus接口适用于MVME2600/MVME2700/MVME3600/MVME4600系列VME模块。要执行此配置，您应该有一个程序员手册中描述的Universe II ASIC知识参考指南。MVME2700板规格表A-1列出了MVME2700系列VME的一般规范模块。后续章节详细介绍了冷却要求和FCC顺从MVME2700的完整功能描述见第3章，功能描述。可选PCI的规格夹层可以在这些模块的文档中找到。冷却要求指定了摩托罗拉MVME2700系列单板计算机，经过设计和测试，可在进气温度下可靠运行范围为0°至55°C（32°至131°F），整个系统强制风冷组装（基板和模块）的速度通常可以通过以下方式实现：使用100 CFM轴流风机。温度鉴定在标准摩托罗拉VME系统机箱。25瓦负荷板插入两个卡槽中，每侧一个，与下面的板相测试，以模拟高功率密度系统配置。大会三个轴流风机中，每个风机的额定功率为100 CFM，直接放置在VME卡固定框架。进气温度是在风机组件和卡笼，其中首先进入气流遇到被测模块。测试软件作为模块执行受到环境温度变化的影响。外壳温度监控关键的高功率密度集成电路，以确保未超过组件供应商的规格。而冷却所需的确切风量取决于环境空气温度和电路板的类型、数量和位置，以及对于其他热源，通常可以使用10 CFM实现充分冷却490线性调频流过模块。需要更少的气流来冷却具有较低最大环境的环境中的模块。在“更多”下良好的热条件下，可以操作模块在高于55°C且气流增加的情况下可靠运行。值得注意的是除了空气动力装置的额定CFM外，还有几个因素，这决定了空气流过管道的实际体积和速度单元
Initializes the PIRQx (PCI Interrupts) route control registers in the IBC
(PCI/ISA bus bridge controller). The ENV parameter is a 32-bit value that
is divided by 4 to yield the values for route control registers PIRQ0/1/2/3.
The default is determined by system type. For details on PCI/ISA interrupt
assignments and for suggested values to enter for this parameter, refer to
the 8259 Interrupts section in the MVME2600/2700 Series Single Board
Computer Programmer’s Reference Guide.Configure the VMEbus Interface
ENV asks the following series of questions to set up the VMEbus interface
for MVME2600/MVME2700/MVME3600/MVME4600 series VME
modules. To perform this configuration, you should have a working
knowledge of the Universe II ASIC as described in the Programmer’s
Reference Guide.MVME2700 Board Specifications
Table A-1 lists the general specifications for MVME2700 series VME
modules. Subsequent sections detail cooling requirements and FCC
compliance.
A complete functional description of the MVME2700 appears in
Chapter 3, Functional Description. Specifications for the optional PCI
mezzanines can be found in the documentation for those modules.Cooling Requirements
The Motorola MVME2700 family of single board computers is specified,
designed, and tested to operate reliably with an incoming air temperature
range from 0° to 55° C (32° to 131° F) with forced air cooling of the entire
assembly (base board and modules) at a velocity typically achievable by
using a 100 CFM axial fan. Temperature qualification is performed in a
standard Motorola VME system chassis. Twenty-five-watt load boards are
inserted in two card slots, one on each side, adjacent to the board under
test, to simulate a high power density system configuration. An assembly
of three axial fans, rated at 100 CFM per fan, is placed directly under the
VME card cage. The incoming air temperature is measured between the
fan assembly and the card cage, where the incoming airstream first
encounters the module under test. Test software is executed as the module
is subjected to ambient temperature variations. Case temperatures of
critical, high power density integrated circuits are monitored to ensure
component vendors’ specifications are not exceeded.
While the exact amount of airflow required for cooling depends on the
ambient air temperature and the type, number, and location of boards and
other heat sources, adequate cooling can usually be achieved with 10 CFM
and 490 LFM flowing over the module. Less airflow is required to cool the
module in environments having lower maximum ambients. Under more
favorable thermal conditions, it may be possible to operate the module
reliably at higher than 55° C with increased airflow. It is important to note
that there are several factors, in addition to the rated CFM of the air mover,
which determine the actual volume and speed of air flowing over a
module.
