National Instruments 500 Series, Начало работы

Страница: 88 / 93

Glossary
VXIpc-486 Model 500 Series Glossary-6 © National Instruments Corporation
supervisory access One of the defined types of VMEbus data transfers; indicated by certain
address modifier codes.
SYSCLK System Clock Driver; a VMEbus functional module that provides a
16 MHz timing signal on the utility bus.
SYSFAIL System Failure Driver; asserts a signal to indicate an internal failure.
SYSRESET System Reset Driver; asserts a signal to indicate a system reset or
power-up condition.
System Controller A functional module that has arbiter, daisy-chain driver, and MXIbus
cycle timeout responsibility.
T
TIC Trigger Interface Chip; a proprietary National Instruments chip used for
direct access to the VXI trigger lines. The TIC contains a 16-bit counter, a
dual 5-bit tick timer, and a full crosspoint switch.
trigger Either TTL or ECL lines used for intermodule communication.
tristated Defines logic that can have one of three states: low, high, and
high-impedance.
TTL Transistor-Transistor Logic
V
V volts
VDC volts direct current
VME Versa Module Eurocard or IEEE 1014
VXIbus VMEbus Extensions for Instrumentation
W
W watts
Word Serial The simplest required communication protocol supported by Message-
Protocol Based devices in the VXIbus system. It utilizes the A16 communication
registers to transfer data using a simple polling handshake method.