National Instruments VXI-MIO Series User Manual page 130

Glossary
dual-access memory
dual-ported memory
dynamic configuration
dynamically configured
device
dynamic range
E
ECL
EEPROM
EISA
embedded controller
event
external controller
external trigger
EXTREF
EXTSTROBE
VXI-MIO Series User Manual
Memory that can be sequentially, but not simultaneously,
accessed by more than one controller or processor. Also known as
shared memory.
Memory that can be simultaneously accessed by more than one
controller or processor.
A method of automatically assigning logical addresses to VXIbus
devices at system startup or other configuration times. Each slot
can contain one or more devices. Different devices within a slot
can share address decoding hardware.
A device that has its logical address assigned by the Resource
Manager. A VXI device initially responds at Logical Address 255
when its MODID line is asserted. The Resource Manager
subsequently assigns it a new logical address, which the device
responds to until powered down.
The ratio of the largest signal level a circuit can handle to the
smallest signal level it can handle (usually taken to be the noise
level), normally expressed in dB.
Emitter-Coupled Logic
electrically erasable programmable read-only memory—ROM
that can be erased with an electrical signal and reprogrammed.
Extended Industry Standard Architecture
An intelligent CPU (controller) interface plugged directly into the
VXI backplane, giving it direct access to the VXIbus. It must have
all of its required VXI interface capabilities built in.
Signals or interrupts generated by a device to notify another
device of an asynchronous event. The contents of events are
device-dependent.
In this configuration, a plug-in interface board in a computer is
connected to the VXI mainframe via one or more VXIbus
extended controllers. The computer then exerts overall control
over VXIbus system operations.
A voltage pulse from an external source that triggers an event
such as A/D conversion.
external reference signal
external strobe signal
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