Keysight Technologies E5400-Pro Series, User Manual

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Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 71
Circuit Board Design 5
E5402A and E5406A-pro series single-ended soft touch probes
Clock input
The clock input to the E5402A and E5406A probe is differential. If you
supply a differential clock, you should select the “differential” option in the
clock threshold user interface.
If your system uses a single-ended clock signal, the clock input should be
either grounded or connected to a dc power supply. You may:
• Ground the clock input and adjust the clock threshold from the user
interface to between -3V dc and +5V dc.
Signal Access
Labels split across probes
If a label is split across more than one pod, this leads to restrictions in
triggering. Refer to “Triggering with the Keysight 1675x and 1676x"
(Keysight publication number 5988-2994EN) for more details.
Reordered bits
If bits need to be reordered within a label, this leads to additional
restrictions in triggering. Specifically, equalities can be used to evaluate
the value of a label with reordered bits, but inequalities cannot be used.
You may be able to avoid the need to reorder bits in a label by routing
signals to appropriate pins on the probe connector. Refer to “Triggering
with the Keysight 1675x and 1676x" (Keysight publication number
5988-2994EN) for more details.
Half-channel 1.25 and 1.5 Gb/s modes (16760A only)
In the half-channel 1.25 and 1.5 Gb/s modes, the 16760A analyzer
accesses only the even channels (0,2,4, etc.). In the Format user interface,
only the even data bits will be connected to the analyzer.
Note that in the 1.25 and 1.5 Gb/s half-channel mode, the clock inputs
cannot be assigned as bits in a label.
E5386A Half-channel Adapter
The E5386A can be used with the E5405B-pro series differential soft touch
probe or the E5402A/E5406A-pro series single-ended probes to map the
signals from the PC board pads to the 16760A when operating in
half-channel state mode.