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Glossary of Terms
A B C D E F G,H I J,K,L M,N,O,P Q R S T U,V W,X,Y,Z
A
Acquisition - The sampling of data from a system under test. Data is stored in acquisition memory so it can
be displayed in different formats or compared to other acquired data.
Acquisition Clock - The clock that determines the rate at which the logic analyzer samples data. The clock
can be an internal analyzer clock with user-selectable sample rate (asynchronous), or it can be an external
clock with the sampling rate determined by the system under test (synchronous).
From these sample points, a list of ones and zeros is generated that represents a one-bit picture of the input
waveform. As far as the analyzer is concerned, the waveform is either high or low, no intermediate steps.
This list is stored in memory and is also used to reconstruct a one-bit picture of the input waveform, as
shown above.
The sample clock can be generated internally by the logic analyzer. This is often referred to as
Asynchronous sampling, since the sampling is not synchronous to any signal in the circuit under test. This
mode is also referred to as Timing Mode since the display shows the timing relationships between input
signals. To get accurate timing information it is necessary that the sample rate of the clock is faster than the
rate at which the signals change.
An external signal may also be used as the sample clock. This sampling mode and is referred to as
Synchronous sampling since it is synchronous to an external signal, usually from the system under test. It is
also referred to as State Mode since the display shows the state of the input signals at the moments when
the clock occurred. See also external clock and internal clock .
Acquisition Memory - The memory in which data acquired by the logic analyzer is stored. Logic analyzers
typically have memory to store several thousand samples per channel.
Conceptually, the acquisition memory acts as a circular buffer. Once the analyzer is started, samples are
stored in sequence. If the analyzer fills memory before a trigger occurs, it will continue to acquire data with
the newest data over-writing the oldest. Once a trigger occurs, the analyzer will either:
pre-trigger data
1.
St op i m m edi at el y - acquisit ion m em or y cont ains wavef or m dat a of signal act ivit y lead ing up t o t he t rigger only ( also cal led
).
post-trigger data
2.
Fi l l t he ent i r em em or y once m or e - acquisit ion m em or y cont ains wavef or m dat a of signal act ivit y t hat occur r ed aft er t he tr igger ( also called
).
pre-trigger post trigger
62
3.
Fi l l onl ya por t i on of m em or y - acquisit ion m em or y cont ains bot h
and
inf or m at ion.
Silicon Explorer II User's Guide
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