Glossary
G-8
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sample rate
The number of samples a system takes over a given time period, usually
expressed in samples per second.
software trigger
A programmed event that triggers an event such as data acquisition.
static digital I/O
See
STOPTRIG
See
Strobed I/O
Any operation where every data transfer is timed by hardware signals. In
the case of pattern I/O, this hardware signal is a clock edge. In the case of
handshaking I/O, hardware signals involve two or three handshaking lines.
synchronous
For hardware, it is a property of an event that is synchronized to a reference
clock. For software, it is a property of a function that begins an operation
and returns only when the operation is complete.
T
t
c
cycle time
t
h
hold time
t
p
propagation time to valid generated data
transfer rate
The rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the maximum
rate at which the hardware can operate.
trigger
Any event that causes or starts some form of data operation.
t
su
setup time
TTL
transistor-transistor logic
t
w
pulse width
U
unstrobed digital I/O
Basic digital I/O operations that do not involve the use of control signals in
data transfers. Unstrobed data transfers are controlled by software
commands. Also known as
software-timed I/O
or
static digital I/O
.
Summary of Contents for NI 653 Series
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