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Glossary
© National Instruments Corporation G-5 NI-VXI User Manual
D
Data Transfer Bus 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.
decimal Numbering system based upon the 10 digits 0 to 9. Also known as
base 10.
de-referencing Accessing the contents of the address location pointed to by a pointer.
default handler Automatically installed at startup to handle associated interrupt
conditions; the software can then replace it with a specified handler.
DIR Data In Ready. This is a bit in the Response register of a message-
based device that indicates that the device is ready to accept data from
its Commander.
DIRviol Data In Ready violation. A type of word serial protocol error that
occurs when the Commander attempts to write data to the device when
the device is not ready.
DOR Data Out Ready. This is a bit in the Response register of a
message-based device that indicates that the device is ready to output
data to its Commander.
DORviol Data Out Ready violation. A type of word serial protocol error that
occurs when the Commander attempts to read data from the device
when the device is not ready.
DRAM Dynamic RAM (Random Access Memory); storage that the computer
must refresh at frequent intervals.
DTB See Data Transfer Bus.
E
ECL Emitter-Coupled Logic
embedded controller A computer plugged directly into the VXI backplane. An example is
the National Instruments VXIpc-850.
END Signals the end of a data string.