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TABLE 1-1 VXIBUS GLOSSARY

Commander: A VXIbus device that has VME bus master capability and may have VXIbus servants under it in

the system hierarchy. A Commander may act as a Servant to another Commander. A Commander must be message

based.

Servant: A VXIbus device (with or without VME bus master capability) that is under control of a Commander in

the VXIbus system hierarchy. A Servant may also be a Commander to other Servants. A Servant may be either

message or register based.

Interrupt Handler: The module in the VXIbus system that generates the hardware interrupt acknowledge for a

particular VME interrupt level. In VXIbus, the software interrupt handler may or may not be on the same module

as the hardware interrupt handler.

Logical Address: A unique 8 bit number (0-255) which identifies each VXIbus device in a system. It defines the

device’s A16 register addresses

Resource Manager: A message based commander located at logical address 0 which provides configuration

management services, including address map configuration, Commander/Servant mapping, self test, and diagnostic

management.

VXI Message Based Instrument: An intelligent instrument that implements the defined VXIbus registers and,

at a minimum, word serial protocol.

VXI Word Serial Messages: The simplest required communication protocol supported by Message Based devices

in a VXIbus system. It utilizes the A16 communications registers to transfer data or commands as a series of

characters on the VXIbus backplane. The end bit is asserted on the last character of the message. Uses Word Serial

Commands: Byte Available and Byte Request.

VXI Word Serial Commands: Single word, 16-bit commands sent from the commander to its servants. Some

Word Serial Commands have a response word. The VXI specification defines a number of standard Word Serial

commands that are reserved for use by the Slot 0 Controller or the Resource Manager. The specification also allows

instrument designers to define their own Word Serial Commands.

VXI Commands: These are commands passed from a Commander to a Servant within the VXIbus environment.

There are three broad categories of commands: VXIbus Instrument Protocols, IEEE 488.2 Common Commands and

Device specific commands. A command may or may not be stimulated by an external event. For example an IEEE-

488 Group Execute Trigger will generate a trigger command to all addressed devices. However, a Begin Normal

Operations command is generated by the VXIbus resource manager and has no external source.

VXI Events: VXIbus Events are passed from a Servant to a Commander. They may be generated by the Servant

either in response to a command (e.g., an invalid command error), or due to an external condition (e.g., data ready

or status change).

VXI Fast Data Channel: A method for exchanging data between a commander and a servant module that utilizes

a minimum of handshaking to transfer data so that the data transfer rate approaches the theoretical VME bus transfer

rate. May allow a commander access to portions of the device's memory or a register in the A24 or A32 address

space. Data transfer is unidirectional for each channel and can be D16 or D32 bit words. Multiple channels may

be opened for each device.

488-VXIbus Interface Device: An IEEE-488 to VXIbus Interface Device is a message based device which

provides communication between the IEEE-488 bus and VXIbus instruments. Typically this function is included

in the Slot 0 card for external control of the VXI chassis.

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