Keysight Technologies N5990A User Manual page 56

2 N5990A M-PHY Station
56
Use D-Box
For J-BERT N4903B configuration, the de-emphasis can be generated
either with a De-emphasis Box or with the second channel of the J-BERT.
Select Use D-Box to use the external De-Emphasis Box.
Use external Ref Clock
It is available only when you select the J-BERT N4903B or M2080A
configuration systems in the Station Configuration (see
reference clock generated by the J-BERT is not continuous when the
generators are stopped. This can happen when loading a new pattern to it
and the jitter sources are enabled. In this case, use an external reference
clock source by selecting the Use External Clock check box. The reference
clock source can either be an additional instrument or the reference clock
output from the DUT.
The available options are:
• PLL (only HS tests): The External PLL mode is used to lock the
generator to an external clock and the provided clock must not be
modulated. A clock multiplication with x/y is possible, with x/y = 1, 2, 3,
to 255 for N4903B and x/y = 2 to 162 for M8020A. It can not be used
for PWM tests because of the hardware multiplier limitation.
• Direct: In External clock mode, all output signals follow the external
clock and it's modulation. For J-BERT N4903B system configuration,
the modulation range is from 6.75 Gbps to 12.5 Gbps and below 6.75
GHz, SJ and SSC are not available. However, the external clock can
optionally be divided by 1, 2, 4, 8, or 16. For M8020A generator, the
modulation range is from 8.1 GHz to 16.207 GHz.
• External 10Mhz: The generator will be lock to an external 10MHz
reference clock.
For more details about the external clock refer to the "J-BERT 4903B" and
"J-BERT M8020A" manuals, respectively.
The N5990A allows an external reference clock source to be used but it is
NOTE
not responsible for its setup.
Manual break at the sequence start
If selected, the sequence will start with a manual break.
Lane Test Mode
The Unipro PHY test mode allows to test multi-lane simultaneously.
Keysight N5990A MIPI M-PHY Receiver Test User Guide
Figure 15). The