National Instruments VXI-1394 - Manual (Page 64)

Glossary
VXI-1394 User Manual for Windows G-4 ni.com
Commander A message-based device that is also a bus master and can control one or
more Servants.
configuration registers A set of registers through which the system can identify a module device
type, model, manufacturer, address space, and memory requirements. To
support automatic system and memory configuration, the VXI specification
requires that all VXIbus devices have a set of such registers.
D
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.
DMA Direct Memory Access—a method by which data is transferred between
devices and internal memory without intervention of the central processing
unit. DMA is the fastest method of transferring data to/from computer
memory.
DRAM Dynamic RAM (Random Access Memory)—storage that the computer
must refresh at frequent intervals.
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. The Resource Manager subsequently assigns it a new
logical address, to which the device responds until powered down.
E
ECL Emitter-Coupled Logic.
EEPROM Electronically Erasable Programmable Read Only Memory—ROM that
can be erased with an electrical signal and reprogrammed.
embedded controller 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.
EMC Electromagnetic compliance.