Atec Agilent-16700 Series - Manual (Page 29)

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Data Acquisition and Stimulus
State/Timing Modules
Eye scan
In the eye scan mode, the Agilent
16753A, 16754A, 16755A, 16756A,
and 16760A scans all incoming
signals for activity in a time range
centered on the clock and over the
entire voltage range of the signal.
The results are displayed in a graph
similar to an eye diagram as seen
on an oscilloscope.
As timing and voltage margins
continue to shrink, confidence in
signal integrity becomes an
increasingly vital requirement of
the design verification process.
Eye scan lets you acquire comprehen-
sive signal integrity information on
all the buses in your design, under a
wide variety of operating conditions,
in minimum time.
Qualified eye scan
In the qualified eye scan mode
(16760A only), a single qualifier
input defines what clock cycles are
to be acquired and what cycles are
to be ignored in the eye scan
acquisition. For example, you may
wish to examine the eye diagram
for read cycles only, ignoring
write cycles.
Cursors
Two manually positioned cursors
are available. The readout indicates
the time and voltage coordinates of
each cursor.
Eye limit
The eye limit tool is a single point
cursor that can be positioned manu-
ally. The readout indicates the inner
eye limits detected at the time and
voltage coordinates of the cursor.
Histogram
The histogram tool indicates the rela-
tive number of transitions along a
selected line. The time range and
voltage levels of the histogram are
selected by manually positioning a
pair of cursors. The cursors indicate
the voltage level and the beginning
and end times of the histogram.
Polygon
A 4-point or 6-point polygon can be
defined manually.
Slope
The slope tool indicates DV/DT
between two manually - positions
cursors.
Eye scan allows the user to set the
following variables:
• The number of clock cycles to be
evaluated at each time and voltage
region
• The display mode
• Color graded
• Intensity shaded
• Solid color
• Aspect ratio of the display
• Time/division
• Time offset
• Volts/division
• Voltage offset
• Time resolution of measurement
• Voltage resolution of
measurement
Results can be viewed for each
individual channel. A composite
display of multiple channels and/
or multiple labels is also available.
Individual channels can be
highlighted in the composite view.
Eye scan data can be stored
and recalled for later comparison
or analysis.