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VCIbus hardware. VME eXtensions for instrumentation bus (VXI bus) refers to standards for automated test based upon VMEbus.VXI defines additional bus lines for timing and triggering as well as mechanical requirements and standard protocols for configuration, message-based communication, multi-chassis extension, and other features.
It was specified by the IVI Foundation [1] and is intended to replace the older VXI-11 [2] protocol. Like VXI-11, HiSLIP is normally used via a library that implements the VISA API. Version 1.4 of the LAN eXtensions for Instrumentation (LXI) standard recommends HiSLIP as “LXI HiSLIP Extended Function for LXI based instrumentation”.
The VISA standard [1] includes specifications for communication with resources (usually, but not always, instruments) over T&M-specific I/O interfaces such as GPIB and VXI. There are also some specifications for T&M-specific protocols over PC-standard I/O, such as HiSLIP [2] or VXI-11 [3] (over TCP/IP) and USBTMC [4] (over USB).
The VXI bus architecture is an open standard platform for automated test based on the VMEbus. Introduced in 1987, VXI uses all Eurocard form factors and adds trigger lines, a local bus, and other functions suited for measurement applications.
VXI combines VMEbus specifications with features from the general-purpose interface bus (GPIB) to meet the needs of instrumentation applications. Other technologies for VME, VPX and VXI controllers and processors may also be available. Selecting VME, VPX and VXI bus interfaces and adapters requires an analysis of available technologies.
The VXIplug&play Systems Alliance was founded in 1993 [2] with the aim of unifying VXI hardware and software to achieve 'plug and play' interoperability for VXI and GPIB instruments. As part of the unifying process, VXIplug&play instrument drivers [3] were also defined.
They can also be present in test systems which include products based on the GPIB, VXI, and PXI standards. The standard mandates that every LXI instrument must have an Interchangeable Virtual Instrument (IVI) driver. The IVI Foundation defines a standard driver application programming interface (API) for programmable instruments.
In many ways the VMEbus is equivalent or analogous to the pins of the 68000 run out onto a backplane.. However, one of the key features of the 68000 is a flat 32-bit memory model, free of memory segmentation and other "anti-features".