Keysight N5990A MIPI M-PHY Receiver Test User Guide 135Calibrations 4ProcedureThe pattern generator data outputs are connected to the DSO channelswith a ISI board between them.The generator does a sweep of the differential voltage amplitude, startingwith the default Differential Voltage Start Value (400 mV) and is decreasedby a Step Size value. At each step, the eye is centered using the histogramof the DSO and the two amplitude measurements are taken using theupper and lower part of the eye. The smallest amplitude value between thetwo measurements is saved for each step.Connection DiagramRefer to the connection diagrams shown in the Connection Diagramsection of the ISI (w/Switch) Calibration test.ParametersThe parameters used in Expert Mode for this procedure, are as follows:• Lane Under Test Termination Mode• Oscilloscope Bandwidth• Differential Voltage Start Value• Step Size• Number of Histogram Hits• Total Jitter• SI (p-p)• Minimum Accumulated Differential Voltage• Use Infiniisim• Transfer Function Chan2• Filter Delay Chan2• Max Time Span Chan2WARNING If the calibration fails and shows the message "Levels for Eye Openingaccording to Specification 40mV were not reached", the DifferentialVoltage Start Value must be increased to reach the Minimum AccumulatedDifferential Voltage value (default value, 40 mV). Due to the increaseddifferential voltage, the DUT could be damaged due to the violation of theMaximum Differential Voltage value while running the Test 2.1.2, HS-RXAccumulated Differential Input Voltage Tolerance Test.
