Keysight U4421A, Hardware And Probing Manual

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2 Setting up a Stimulus Probe Configuration for U4421A Module
16 Keysight U4421A MIPI D-PHY Analyzer and Exerciser Hardware and Probing Guide
Connecting the U4422A Probe to the U4421A module and DUT
The U4422A stimulus probe connects to the DUT via 50-ohm coaxial cables using SMA connectors.
1 Plug the module connector (refer
Figure 2
) of the stimulus probe to the Exerciser port on the
front panel of the U4421A module.
2 Hand-tighten the thumb screws on both sides of the module connector of the probe.
3 Connect the appropriate coaxial cables (with SMA connectors) of the probe to the DUT. (You can
refer to
Table 1
to verify which coaxial cables to connect.)
a Connect the cables for D-Phy clock lane positive and negative signals (labelled Clkp and Clkn ).
In the stimulus mode, the U4421A module emulates a master and transmits the clock to the
D-Phy link partner. Therefore, you must always connect the set of clock signal cables, Clkp
and Clkn.
b Based on the link width needed, connect the set of cables for D-Phy data lanes 0 to 3.
i
For a x1 link, connect the cables for D-Phy data 0 lane positive and negative signals
(labelled D0p and D0n ).
ii
For a x2-x4 link, connect the additional cables for D-Phy data 1 to 3 lane positive and
negative signals (labelled D1p and D1n , D2p and D2n , and D3p and D3n ).
You may leave the coaxial cables for the unused data lanes disconnected.
c If you plan to configure the U4421A module to use an external reference clock, then connect
the coaxial cables (labelled Refp and Refn ) for accepting the external reference clock input
signals. These signals then supply the external reference clock to the U4421A module and set
the HS bit rate for the module. Refer to the topic
“Supplying External Reference Clock
to the U4421A Module"
on page 17 to know more.
d Connect the cable for the DUT’s supply voltage sense signal (labelled Vsen ) to the DUT’s
power supply. The DUT sends this signal to the U4421A module to indicate when the module
can actively send D-Phy signals to the DUT.
CAUTION
The output voltage of the U4422A stimulus probe is user- configurable. You can turn on and
set the output voltages using the Keysight Protocol and Logic Analyzer GUI.
Be careful to set voltage levels correctly before plugging the stimulus probe into your board.
If the output voltage level is configured at a level too high for your board, your board may be
damaged.
Exerciser port on U4421A module