Glossary
© National Instruments Corporation
Glossary-5
VME-MXI-2 User Manual
D
daisy-chain
A method of propagating signals along a bus, in which the
devices are prioritized on the basis of their position on the bus.
Data Transfer Bus
DTB; one of four buses on the VMEbus backplane. The DTB is
used by a bus master to transfer binary data between itself and a
slave device.
deadlock
Unresolved situation in which two devices are vying for the use
of a resource.
DIP
Dual Inline Package
DMA
Direct Memory Access; a method by which data is transferred
between devices and internal memory without intervention of
the central processing unit.
DRAM
Dynamic RAM (Random Access Memory)
DTACK*
Data Acknowledge signal
DTB
See Data Transfer Bus.
dynamic configuration
A method of automatically assigning logical addresses to
VXIbus devices at system startup or other configuration times.
dynamically configured device
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. A MXIbus device
responds at Logical Address 255 during a priority select cycle.
The Resource Manager subsequently assigns it a new logical
address, which the device responds to until powered down.
E
ECL
Emitter-Coupled Logic
EEPROM
Electronically Erasable Programmable Read Only Memory
embedded controller
An intelligent CPU (controller) interface plugged directly into
the VME backplane, giving it direct access to the VMEbus. It
must have all of its required VME interface capabilities built in.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
