Keysight Technologies N5990A, User Manual

Page: 241 / 318

Keysight N5990A MIPI M-PHY Receiver Test User Guide 241
PWM Tests 7
Procedure
The data generator sends Burst-mode CJTPAT signaling while the DUT is
configured for Terminated-mode or Non-Terminated-mode depending on
the test case.
In Compliance Mode , the calibrated Level Pairs (VDIF-RX and V
CM-RX
) are
set to two different test cases: maximum differential voltage and maximum
common-mode (V
DIF-RX
= 245mV and V
CM-RX
= 330mV for RT, V
DIF-RX
=
490mV and V
CM-RX
= 330mV for NT); minimum differential voltage and
minimum common-mode (V
DIF-RX
= 60mV and V
CM-RX
= 25mV for RT,
V
DIF-RX
= 120mV and V
CM-RX
= 25mV for NT). 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 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 2.1.1- HS-RX Differential Input Voltage Amplitude Test
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
• Test Sequence
• Re-Init sequence after Reset DUT