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Glossary
PCI-MXI-2 for Linux G-4 ni.com
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.
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.
driver window A region of PCI address space that is decoded by the PCI-MXI-2 for use by
the NI-VXI software.
DTACK* Data Acknowledge signal.
DTB See Data Transfer Bus.
dynamically configured
device
A device that has its logical address assigned by the Resource Manager.
AVXI 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.
dynamic configuration A method of automatically assigning logical addresses to VXIbus devices
at system startup or other configuration times.
E
ECL Emitter-Coupled Logic.
EEPROM Electronically Erasable Programmable Read Only Memory.
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 Electromechanical Compliance.