Specifications

10
A Built-in Pattern Generator Gives You Digital Stimulus and Response
in a Single Instrument
Selected 16800 Series models
(16821A, 16822A and 16823A)
also include a 48-channel pattern
generator to drive down risk early
in product development. With a
pattern generator you can:
• Substitute for missing boards,
integrated circuits (ICs) or
buses instead of waiting for
missing pieces
• Write software to create
infrequently encountered test
conditions and verify that the
code works – before complete
hardware is available
• Generate patterns necessary to
put a circuit in a desired state,
operate the circuit at full speed
or step the circuit through a
series of states
• Create a circuit initialization
sequence
Agilent 16800 Series portable
logic analyzers with a pattern
generator offer a variety of
features that make it easier for you
to create digital stimulus tests.
Vectors up to 48 bits wide
Vectors are defined as a “row” of
labeled data values, with each
data value from one to 48 bits
wide. Each vector is output on
the rising edge of the clock.
Create stimulus patterns for the
widest buses in your system.
Depth up to 16 M vectors
With the pattern generator, you
can load and run up to 16 M
vectors of stimulus. Depth on this
scale is most useful when coupled
with powerful stimulus generated
by electronic design automation
tools, such as SynaptiCAD’s
WaveFormer and VeriLogger.
These tools create stimulus using
a combination of graphically
drawn signals, timing parameters
that constrain edges, clock signals,
and timing and Boolean equations
for describing complex signal
behavior. The stimulus also can
be created from design simulation
waveforms. The SynaptiCAD tools
allow you to convert .VCD files
into .PGB files directly, offering
you an integrated solution that
saves you time.
Synchronized clock output
You can output data synchronized
to either an internal or external
clock. The external clock is input
via a clock pod, and has no
minimum frequency (other than
a 2 ns minimum high time).
The internal clock is selectable
between 1 MHz and 300 MHz in
1-MHz steps. A Clock Out signal is
available from the clock pod and
can be used as an edge strobe with
a variable delay of up to 8 ns.
Initialize (INIT) block for
repetitive runs
When running repetitively, the
vectors in the initialize (init)
sequence are output only once,
while the main sequence is
output as a continually repeating
sequence. This “init” sequence is
very useful when the circuit or
subsystem needs to be initialized.
The repetitive run capability
is especially helpful when
operating the pattern generator
independent of the logic analyzer.
“Send Arm out to…” coordinates
activity with the logic analyzer
Verify how your system responds
to a specific stimulus sequence by
arming the logic analyzer from
the pattern generator. A “Send
Arm out to…” instruction acts as a
trigger arming event for the logic
analyzer or other test equipment
to begin measurements. Arm
setup and trigger setup of the
logic analyzer determines the
action initiated by “Send Arm
out to…”.
Figure 3. Models with a built-in pattern generator give you
more measurement flexibility.