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1.1.2 VXIbus Description

1.1.2.1 VXIbus Objectives

The goal of the VXIbus Consortium is to create an open industry standard for modular instruments

by defining interoperability between vendors, mechanical and environmental requirements, EMC

compatibility, system initialization and software communication protocols. The physical portion of

the VXIbus specification was adapted from the existing VME bus specification (IEEE-STD 1014).

VXI is an acronym for “VME bus Extensions for Instrumentation.”

The VXIbus specification details the technical requirements of VXIbus compatible components such

as mainframes, backplanes, power supplies and modules. The specification also provides for

interconnecting and operating different manufacturers’ products within the same chassis. The latest

revision of the specification is version 1.4. The success of the specification is evidenced by over 300

manufactures who make over 800 different VXIbus products and hundreds of users .

The IEEE Standards Committee, in its IEEE-STD 1155, has adopted the VXIbus consortium’s

specifications. The U. S. Air Force has also accepted the specifications as the basis for its Modular

Automatic Test Equipment (MATE) Instrument on a Card (IAC) standard.

The VXIplug&play Alliance has defined several additional standards that simplifies the integration

of multivendor VXI systems. The VXIplug&play Alliance has created a standard system framework

concept that allows test programs in any language and operating system to be able to control VXI

chassis and instrument modules through Standard Instrument Drivers. The VXIplug&play

Framework identifies the operating system (OS) and applications development environment (ADE)

used to generate the test software. The VXIplug&play Alliance just adopted an updated specification

for a set of standard VISA Transition Library drivers that the Slot 0 Controllers and Embedded

Computer vendors should adhere to assure VXIplug&play compatibility. The VISA (Virtual

Instrument Software Architecture) drivers are used between the end user's test application program

or general purpose test programs purchased from software vendors and the physical VXI modules

or GPIB instruments. These VISA Transition Library (VTL) drivers are described in the VXIplug&play

VPP-4.2 Specification Version 3.0 and are referred to as the VTL 3.0 drivers.

1.1.2.2 Advantages of VXIbus Based Systems

The VXIbus provides the user with the following advantages:

Higher density packaging

Increased system throughput

More precise timing and device synchronization

Standard protocols for instrument communication and control

Ability to utilize existing VME modules

Lower costs due to shared resources.

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Samsung SMO-150QP Especificaciones Pagina 11