Keysight Technologies N5990A, User Manual

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Keysight N5990A MIPI M-PHY Receiver Test User Guide 253
PWM Tests 7
Procedure
The data generator sends Burst-mode CJTPAT signaling while the DUT is
configured for Terminated-mode. The differential voltage amplitude and
the common-mode are set to the nominal values (200mV). No other signal
impairments such as the ISI channel or the jitter sources are added to the
signal.
A sweep of the calibrated Lane-to-Lane skew is done in the tested lane,
starting with the Min Tested Value (minimum skew value) and increasing
with the given Step Size value until the Max Tested Value is reached. At
each step the BER is measured and compared with the Target BER to
consider the pass/fail result.
This test is performed at each selected lane and PWM gear and it is tested
at the minimum and maximum data rate value for all gears.
Connection Diagram
Refer to the connection diagrams shown in the Connection Diagram
section of the Test 2.1.6-HS-RX Lane-to-Lane Skew Test test.
Parameters
The parameters used in Expert Mode for this test, are as follows:
• Level Pairs
• CDR Loop Bandwidth (if CDR is selected in the Special Parameter
dialog, see “BERT Analyzer Settings” )
• CDR Peaking (if CDR is selected in the Special Parameter dialog, see
“BERT Analyzer Settings” )
• CDR Transition Density (if CDR is selected in the Special Parameter
dialog, see “BERT Analyzer Settings” )
• CDR Loop Order (if CDR is select in Special Parameter dialog, see
“BERT Analyzer Settings” )
• Target BER
• IBerReader Init Mode
• Test Sequence
• Re-Init sequence after Reset DUT
• Min Spec
• Min. Tested Value
• Max. Tested Value
• Step Size