:DIFF:EYE:BITS

:DIFF EYE Commands

Command Syntax

:DIFFN:EYE:BITS {ALL | DEEMphasis | TRANsition | PATTern}

Where N identifies a specific differential waveform in the form "<connection1-8>_<ch1|ch3|ch5|ch7>". With connection 1, the connection number part (that is, "1_") is optional, and you can simply use the channel number "<ch1|ch3|ch5|ch7>". When two channels are paired to create a differential waveform and a common-mode waveform, the odd-numbered channel is used when specifying the waveform. For example, connection 5 differential waveform 3 (from the pairing of channels 3 and 4) is DIFF5_3.

Query Syntax

:DIFFN:EYE:BITS?

Query Response

{ALL | DEEM | TRAN | PATT}

Description

The symbol qualification options let you specify the symbols that are included the real-time eye display.

  • All — Shows all symbols in the real-time eye.

  • DEEMphasis — Shows only de-emphasis symbols in the real-time eye (symbols that do not follow a transition).

  • TRANsition — Shows only symbols that occur after transitions in the real-time eye.

  • PATTern — Lets you qualify the real-time eye so that only symbols that occur in the specified pattern are displayed.

    This option is useful, for example, when different DFE equalizations are applied depending on the preceding symbols, and you want to evaluate the DFE for a certain symbol combination.

    To specify the pattern, see the :DIFF:EYE:PATTern command.

    To specify which symbol position in the pattern is symbol 0, see the :DIFF:EYE:CURSor command.