Keysight Technologies N5990A, User Manual

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Keysight N5990A MIPI M-PHY Receiver Test User Guide 163
HS Tests 5
Procedure
The data generator sends Burst-mode CJTPAT signaling while the DUT is
configured for Terminated-mode.
In Compliance Mode , the calibrated Level Pairs (V
DIF-RX
and V
CM-RX
) are
set to four different test cases: nominal differential voltage and maximum
common-mode (V
DIF-RX
= 150mV and V
CM-RX
= 330mV); nominal
differential voltage and minimum common-mode (V
DIF-RX
= 150mV and
V
CM-RX
= 25mV); maximum differential voltage and maximum
common-mode (V
DIF-RX
= 245mV and V
CM-RX
= 330mV); minimum
differential voltage and minimum common-mode (V
DIF-RX
= 60mV and
V
CM-RX
= 25mV). At each step, the BER is measured and compared with
the Target BER to consider the pass/fail result.
In Expert Mode , the common-mode voltage component of each Level Pair
is tested over the given Offset Range. In this case, the result will show the
minimum and maximum offset values at which the DUT works properly and
the test will pass if those values are within the spec limits.
This test is performed for all selected HS lanes and gears (see Figure 98 ).
The Unterminated case is not tested because of the difficulties with
measuring and calibrating while using the unterminated signaling. In
Unipro Test Mode, with the option “Lane Test Mode” set to
Simultaneously, the different lanes are tested in parallel for each gear.
Connection Diagram
Refer to the connection diagrams shown in the Connection Diagram
section of the Test 2.1.1- HS-RX Differential Input Voltage Amplitude Test.
Parameters
The parameters used in Expert Mode for this test, are as follows
• 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 selected in the Special Parameter dialog,
see “BERT Analyzer Settings” )
• Target BER
• IBerReader Init Mode