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首页PCIeXtensions for Instrumentation (PXI) Spec v2.0: Open Industry Standard & Objectives

PCIeXtensions for Instrumentation (PXI) Spec v2.0: Open Industry...

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"PCIeXtensionsforInstrumentation (PXI) Specification Revision 2.0 是一份详细的文档，旨在规范PCI Express (PCIe) 扩展在仪器测试领域的应用。该规格书于2000年7月28日发布，由PXI Systems Alliance编撰并持有版权。这份文档的主要目标是明确PCIe扩展在仪器测试中的核心目标和范围，它定义了目标受众，并提供相关术语和文档列表，以便用户和技术开发者理解。 PXI是一种专为测试、测量和自动化应用设计的工业标准平台，它利用PCIe的高速数据传输能力来增强仪器设备的性能。该规格书详细描述了如何实现PCIe接口与仪器设备的高效集成，包括硬件设计指南、信号处理方法以及通信协议等。对于开发者来说，这意味着他们可以根据这份规范来设计和制造符合标准的PXI模块，确保与其他厂商的产品兼容，从而推动整个行业的标准化进程。重要的是，所有关于PCIe XINST的信息受版权保护，允许在完整且未修改的情况下复制和分发。PXI Systems Alliance鼓励所有对开发PXI兼容产品或服务感兴趣的制造商和服务提供商，以及希望支持并促进PXI作为开放工业标准的各方，与联盟联系获取更多信息和支持。同时，该联盟欢迎对规格书提出反馈，以不断改进和完善这一技术标准。通过这份文档，用户可以了解到如何利用PCIe的高速特性来提升实验室测试的效率，而开发者则可以根据其内容来设计出更强大、灵活和兼容的仪器测试解决方案。因此，深入理解和遵循PXI Specification Rev.2.0对于任何涉足该领域的人来说都是至关重要的，它不仅规范了技术实践，也为行业的持续发展奠定了坚实基础。"

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applicable documents with which the reader may wish to become familiar. This

specification refers to the following documents directly:

• PCI Local Bus Specification, Rev. 2.2

• PICMG 2.0 R3.0 CompactPCI Specification

• VXIplug&play Specifications (VPP-3.x and VPP-7)

• IEC 61326-1:1998, Electrical equipment for measurement, control, and

laboratory use—EMC requirements—Part I, General requirements,

International Electrotechnical Commission

• IEC 1010-1:1990 + A1:1992, Safety requirements for electrical equipment for

measurement, control, and laboratory use—Part 1, General requirements,

International Electrotechnical Commission

• IEC 60068-1, Environmental testing, International Electrotechnical Commission

1.5. Useful Web Sites

Below is a list of web site links that at the time of publication of this specification

point to sites with information useful in the understanding and design of PXI

products.

http://www.pxisa.org/ - PXI specifications

http://www.picmg.org/ PICMG specifications

http://www.ieee.org/ - IEEE specifications

http://www.iec.org/ - IEC specifications

http://www.pcisig.com/ - PCI specifications

http://www.vita.com/ - VME specifications

http://www.vxi.org/ - VXI specifications

http://www.vxipnp.org/ - VISA specifications

Rev. 2.0 July 28, 2000 © PXI Systems Alliance 13

2. PXI Architecture Overview

This section presents an overview of a PXI system’s features and capabilities by

summarizing the mechanical, electrical and software architectures defined by this

specification.

2.1. Mechanical Architecture Overview

PXI supports the two form factors that are depicted in Figure 2.1. The 3U form

factor defines modules that are 100 by 160 mm (3.94 by 6.3 in.) and have two

interface connectors. J1 carries the signals required for the 32-bit PCI local bus and

J2 carries the signals for 64-bit PCI transfers and the signals for implementing PXI

electrical features. The 6U form factor defines modules that are 233.35 by 160 mm

(9.19 by 6.3 in.) and may carry up to two additional connectors for future expansion

of the PXI specification.

3U PXI

6U PXI

64-Bit PCI and

PXI Features

32-Bit PCI

64-Bit PCI and

PXI Features

32-Bit PCI

PXI Reserved

Ejector/Injector

Figure 2.1 PXI Peripheral Module Form Factors and Connectors

Figure 2.2 presents an example of a typical PXI system to help illustrate the

following keywords (in italics). A PXI system is composed of a chassis that

supports the PXI backplane and provides the means for supporting the system

controller module and the peripheral modules. The chassis must have one

system slot and may have one or more peripheral slots. Any number of

controller expansion slots may be available to the left of the system slot. The

optional star trigger controller, when used, must reside next to the system

controller module. If a star trigger controller is not used in a system, a peripheral

module can be installed in the slot next to the system controller module. The

backplane carries the interface connectors (P1, P2, ...) and provides the

interconnection between the controller and peripheral modules. A maximum of

seven peripheral modules can be used in a single 33 MHz PXI bus segment, and

a maximum of 4 peripheral modules can be used in a single 66 MHz PXI bus

segment. PCI-PCI bridges can be used to add bus segments for additional

expansion slots.

8765432

System Controller

Module

Controller

Expansion Slots

System Slot

Star Trigger Controller

or Peripheral Slot

Seven Available

Peripheral Slots

Peripheral Modules Empty Slot

Backplane

Chassis

Ejector

Handles

Figure 2.2 Example of a 33 MHz 3U PXI System (Single Bus Segment)

2.1.1. System Slot Location

PXI defines the system slot location to be on the left end of the PCI bus segment

in a basic PXI system. This defined arrangement is a subset of the numerous

possible configurations allowed by CompactPCI (a CompactPCI system slot

may be located anywhere on a backplane). Defining a single location for the

system slot simplifies integration and increases the degree of compatibility

between PXI controllers and chassis. Furthermore, the PXI specification

requires that if necessary the system controller module should expand to the left

into what are defined as controller expansion slots. Expanding to the left

prevents system controllers from using up valuable peripheral slots.

PXI also defines the location of a star trigger controller slot that can accept a

peripheral module or a special star trigger module that can provide individual

triggers to all other peripheral modules. The star trigger signals are routed from

the star trigger slot to each peripheral slot on all PXI backplanes.

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