Vpx, based on switched fabrics, essentially evolved from the vmebus backplane architecture, which is busbased. We will also discuss the concepts of vme bus controller interfaces available to interface local cpu bus and vme bus. Pcivme card will detect ultra510 pci bus and adjust automatically to support 32 bit. Committed to open standards for embedded computing, vita members share in advancing specifications and creating market awareness for technologies. Page 21 architecture description architecture description chapte r 3 this section describes the general architecture of the pci vme chip universe from tundra microcomputer corporation. A modern alternative to reflective memory and vme app. Another asynchronous bus requires 40 ns per handshake. The p1 connector, the only mandatory one in vme or vxibus, carries the data transfer bus up to 24 bits addressing and 16 bits data, the interrupt bus, and some power. Cpu needs to read an instruction data from a given location in memory zidentify the source or destination of data zbus width determines maximum memory capacity of system e. Power and ground signals which are shown, of course would run to any card connected to the backplane. Multifunction vme io oardbfeatures support flexible. The tables below detail the required control signals to produce the different bus widths. Universe bridges between the vme 64bit bus vme64 to either a 32 or 64bit pci bus at 33 mhz.
The ca91c142d universe ii is the industrys leading highperformance pci to vme interconnect. Vmebus versa module europa or versa module eurocard bus is a computer bus standard, originally developed for the motorola 68000 line of cpus, but later widely used for many applications and standardized by the iec as ansiieee 10141987. It features an ni pxi8320 plugin circuit board, an ni vmemxi2 interface board, a 2 m mxi2 cable, and software for windows. Computer systems interface, a disk drive interface standard with higher performance than ide. Versa module eurocard vme backplane bus is a computer bus standard, originally developed for the motorola 68000 line of cpus, but later widely used for many applications and standardized by the iec as ansiieee 10141987. Integrating enterprise service buses in a serviceoriented architecture martin keen jonathan bond jerry denman stuart foster stepan husek ben thompson helen wylie integrate esbs in websphere v6 and message broker v5 patterns for integrating esbs learn by example with practical scenarios front cover. This standard addresses communication between vme boards using the p2 connector. This article first describes fundamental information on bus architectures and bus protocols, and then provides specific information on various industry standard bus architectures from the past and the present. Vme is a high speed and high performance bus system with powerful interrupt management and multiprocessor capability. Continuous increases in fpga capacity, architectural features and performance, along with decreases in cost, results in an ideal solution to. Other architectures with other sub buses are possible within this vme framework. The backplane and all of the modules connected to it reside in an enclosure that serves to protect the components, provide. Pcixto vme bus bridge programming manual document number. The outstanding performance of vme processor boards based on the powerplus architecture is not due to a single factor.
The vmebus architecture is a shared system bus architecture. A zerowait state implementation, with multibeat transactions and support for bus parking, ensures that the universe ii is never the bottleneck on the pci bus. As leading cots vendors return to implementing their vme interfaces in fpgas, the result is life extension for the venerable bus architecture, ensuring that the vmebus will remain viable for. The backplane has slots where processor modules, memory modules, or io modules connect to the system bus 6, 7. Find the bandwidth of each bus for oneword reads from 200ns memory. Vme may have been the first truly open architecture industry standard in the computing world. Page 34 dynamic bus arbitration contd vme bus arbitration. A new generation of io boards incorporating multifunction io, bus master function, ethernet and system processors provide flexibility for implementation of new vme system architectures. In a market dominated by proprietary mainframes and minicomputers, the vme specification was placed in the public domain when it was created in 1981, enabling a new era of customercentric computing. Vhdl isa bus multibus ii architecture specification xc7354 vme to isa bridge xc9500 xc40e xc4000e xc4000 xc3100a text. Dandamudi, fundamentals of computer organization and design, springer, 2003.
Early systems, regardless of the bus architecture, tended to place a cpu on. This bus includes the initial four basic sub buses. Vita is the organization driving technology and standards for the bus and board industry. May 2004 this document discusses the features, capabilities, and configuration requirements of tsi148. One synchronous bus has a clock cycle time of 50 ns with each bus transmission taking 1 clock cycle. This group was composed of people from motorola, mostek and signetics corporations who were cooperating to define the standard. Interfacing vmebus to a faulttolerant architecture in.
An evaluation of the vme architecture for use in embedded. With a pxi or compactpci chassis to control vme, you can build systems that take advantage of all of the best features of each bus architecture. Vmebus is a computer architecture vme versa module eurocard 1980. The main advantages for embedded applications like the stt are. It is widely available as 16bit, 32bit and 64bit vme computer systems. Vmebus module on the opposite side of the backplane via the user defined pins of the j0, j2 and j3. Vmebus products, vme bridges, vme to pci bridges, and. Hazen 091799 pci fundamentals the pci bus is the defacto standard bus for currentgeneration personal computers. Tsi148 eases design constraints of vme single board computers sbcs by requiring less board real estate and power than the previous generation of vme topcix bridge components.
It is physically based on eurocard sizes, mechanicals and connectors, but uses its own signalling system, which eurocard does not define. Vmebus versa module europa or versa module eurocard bus is a computer bus standard, originally developed for the motorola 68000 line of cpus, but later widely used for many applications and standardized by the iec as ansi ieee 10141987. Vme cards may be produced which respond to the following address widths or data widths. Multifunction vme io oardbfeatures support flexible system architectures. Vmebus products, vme bridges, vme to pci bridges, and vme64. A secondgeneration architecture, powerplus ii architecture is a processor and bus architecture fully optimized to get the maximum performance from the powerpc microprocessor family, the pci bus, and the vmebus. The purp ose of this do t cumen is to e giv the reader enough wledge kno b egin using the anguard v vmetro vme bus proto col analyzer. The powerplus architecture is a processor and bus architecture fully optimized to get the maximum performance from the powerpc microprocessor family, the pci bus, and the vmebus. This standard describes a high performance skychannel packet bus architecture that is fully compatible with the vmebus standards. The vmebus interface system consists of backplane interface logic, four groups of signal lines called buses. The vxibus specifies three 96pin din connectors called p1, p2, and p3. As other bus architectures come and go, highland remains confident that vme will maintain its position as the architecture of choice for essential, long life cycle programs. The vmebus address should be aligned to the data size reading a d32 word e. The ni vme pxi8015 links any pxi or compactpci system directly to the vmebus using a highspeed mxi2 link.
Computer bus structures california state university, northridge. Its use of the eurocard format, its high performance, and its versatility are some of the reasons that it appeals to a wide range of users. Vme bus analyzer the features and operation of the vme850 bus analyzer to understand, diagnose and analyze system problems and performance of a vme bus is presented. The term vme stands for versamodule eurocard and was first coined in 1980 by the group of manufacturers who defined it. Pcivme can be installed in any available pci slot without any restriction. The powerplus architecture is a processor and bus architecture fully optimized to get the maximum performance from the powerpc architecture microprocessor family, the pci bus, and the vmebus. Mvme5100 series vme processor modules mpc7410, mpc750 or mpc755 class microprocessor with 32kb32kb l1 cache up to 2mb of secondary backside cache 100 mhz frontside bus up to 512mb of onboard ecc sdramexpandable up to 1gb with optional ram500 memory expansion modules 17mb flash memory dual ieee p86. Vmebus vmebus is a computer architecture vme versa module eurocard 1980 bus is a generic term describing a computer data. The vmepxi8015 kit includes all you need for interfacing pxi or compactpci to vme. It is physically based on eurocard sizes, mechanicals and connectors din 41612, but uses its own. Pdf strong partitioning protocol for a multiprocessor. Introduction to vme launched in 1981, based largely on motorolas versabus technology, the vme bus has been a mainstay technology in both military and industrial io for over 25 years. It is physically based on eurocard sizes, mechanicals and connectors din 41612, but uses its own signalling system. It is intended for software engineers who are designing system interconnect applications with tsi148 and require.
With this architecture, throughput is maximized without sacrificing bandwidth on either bus. Vme may have been the first truly open architectureindustry standard in the computing world. Datasheet mvme5100 series vme processor modules mpc7410, mpc750 or mpc755 class microprocessor with 32kb32kb l1 cache up to 2mb of secondary backside cache 100 mhz frontside bus up to 512mb of onboard ecc sdramexpandable up to 1gb with optional ram500 memory expansion modules 17mb flash memory dual ieee p86. Like the venerable rs232 interface, people have been predicting the demise of the vme bus for some time. The signaling scheme is asynchronous, meaning that the transfer is not tied to the timing of a bus clock. Pci bus operation a guide for the uninformed by the slightly less uninformed. Vxi stands for vme extensions for instrumentation, defining additional bus lines for timing and triggering as well as mechanical requirements and standard protocols for configuration, messagebased communication, multichassis extension, and other features. The graphic represents the major signals that are used by a vme slave interface. It was created by combining versabus electrical specifications 1979 with the eurocard format resulting in the vmebus revision a. The vmebus architecture is a nonproprietary bus, and a number of third party vmebus manufacturers are available.
A new generation of io boards incorporating multifunction io, bus master function, ethernet and system processors provide flexibility for implementation of new. Vme bus description, pinout and vme standards information. Bus is a generic term describing a computer data path. Other architectures with other subbuses are possible within this vme framework.
P2 the optional p2 connector, available to all card sizes except a. The vxi bus architecture is an open standard platform for automated test based upon vmebus. However the reset line, which is also shown, might not be used by every card in the system. Strong partitioning protocol for a multiprocessor vme system. Laboratory for data acquisition and controls last modified on 42020 9.
Highland technology is a member of vita, the vme standards body, and continues to release new technology into the vme market. The vme pxi8015 kit includes all you need for interfacing pxi or compactpci to vme. Bus performance example the step for the synchronous bus are. Vme mxi2 interface kits for pxicompactpci ni vmepxi8015. This paper describes the general characteristics of the vme bus, its architecture and applications. The data transfer bus will support 8, 16, 32, and 64bit data transfers in multiplexed and non multiplexed form. Tsi148 eases design constraints of vme single board computers sbcs by requiring less board real estate and power than the previous generation of vmetopcix bridge components. Basics operations errors vmetro overview physical logical introduction goals become familiar with language of vme operations interpret vmetro bus analyzer data. It is physically based on eurocard sizes, mechanicals and connectors, but uses its own signalling system, which. Home interface buses backplane buses vme bus vme slave interface. Multifunction vme io oardbfeatures support flexible system.
Pdf vme bus interface an overview semantic scholar. Vme bus description the vme bus is a scalable backplane bus interface. Highest priority rotatingpriority roundrobin based policy 4assigns the lowest priority to the bus that just received the bus daisychaining implemented by connecting all masters to br3. Northholland microprocessing and microprogramming 18 1986 289296 289 interfacing vmebus to a faulttolerant architecture in the industrial environment. It is fully compliant with the vme64 bus standard, and is tailored to support advanced pci processors and peripherals. A vme system is a set of connected vme boards, plugged to a vme backplane or vme chassis. Connecting these parts are three sets of parallel lines called buses.
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