National Instruments 653 Series User Manual page 137

Glossary
sample rate
software trigger
static digital I/O
STOPTRIG
Strobed I/O
synchronous
T
t
c
t
h
t
p
transfer rate
trigger
t
su
TTL
t
w
U
unstrobed digital I/O
NI 653X User Manual
The number of samples a system takes over a given time period, usually
expressed in samples per second.
A programmed event that triggers an event such as data acquisition.
See unstrobed digital I/O
See control signals
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.
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.
cycle time
hold time
propagation time to valid generated data
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.
Any event that causes or starts some form of data operation.
setup time
transistor-transistor logic
pulse width
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.
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