Specifications

11
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 genera-
tor to drive down risk early in product
development. With a pattern genera-
tor 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.
Figure 3. Models with a built-in pattern generator give you more measurement flexibility.
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 stimu-
lus 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 vec-
tors in the initialize (init) sequence
are output only once, while the main
sequence is output as a continu-
ally repeating sequence. This “init”
sequence is very useful when the
circuit or subsystem needs to be ini-
tialized. 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… .”