Protocol analysis
R&S
®
RTP
918User Manual 1337.9952.02 ─ 12
Timing reference
Defines the timing reference.
Source ← Timing reference
Selects the waveform that is used to obtain the timing information required to slice the
data source waveform.
If you perform eye diagram analysis on the DDR serial protocol, select the serial bus
here. The instrument determines the timing information according to protocol specifics.
Remote command:
EYE<m>:TREFerence[:SOURce] on page 2185
Slope / Vertical ref. level ← Timing reference
Sets the edge and reference level to define the timestamps for slicing the data wave-
form. A timestamp is set each time when the selected slope of the timing waveform
crosses the selected reference level.
Remote command:
EYE<m>:TREFerence:LEVel on page 2186
EYE<m>:TREFerence:SLOPe on page 2185
Horizontal settings
Defines the horizontal settings.
Time units ← Horizontal settings
Sets the method to define the horizontal scale of the eye diagram: as absolute time, or
in unit intervals. You can use unit interval, if the nominal frequency of the clock signal is
known.
Indirectly, the horizontal scale determines the size of one waveform slice. The wave-
form slice must be fully contained in the waveform acquisition to contribute to the eye
diagram.
Remote command:
EYE<m>:HORizontal[:UNIT] on page 2186
Range, Position ← Horizontal settings
Available for Time units = "Absolute time"
Define the horizontal scale in absolute time.
"Range"
Time range that is covered by the eye diagram.
"Position"
Place of the zero point in the diagram, in seconds. The zero point is
the alignment point on which the slice timestamps are superimposed.
Remote command:
EYE<m>:HORizontal:ABSolute:RANGe on page 2186
EYE<m>:HORizontal:ABSolute:POSition on page 2187
Bit rate, Range UI, Position UI ← Horizontal settings
Available for Time units = "Unit interval (UI)"
Define the horizontal scale in unit intervals. A unit interval typically corresponds to a bit
in the input data signal.
DDR (option R&S
RTP-K91/K93 )
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