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The phase error is measured from the crosspoint of the input reference signals to the crosspoint of the output signals. For example, Pericom clock driver phase error is measured from CK and CK/ input pins to FBIN and FBIN/ pins. Therefore, all 4 probes of a typical oscilloscope are used.
A full detail explanation and product guidelines for memory modules and DDR applications can be found in our Applications section under Memory Modules.
