falltime

Measure fall time from eye diagram

Since R2024a

Syntax

f = falltime(obj)

f = falltime(___,Name=Value)

[f,lt,ut,ll,ul] = falltime(___)

Description

f = falltime(obj) measures the fall time from the eye diagram object obj.

f = falltime(___,Name=Value) measures the fall time from the eye diagram using one or more name-value pair arguments in addition to the input argument in the previous syntax. Unspecified arguments take default values.

[f,lt,ut,ll,ul] = falltime(___) measures the fall time, upper and lower threshold crossing times, and upper and lower reference level amplitude values.

Input Arguments

obj — Eye diagram object

eyeDiagramSI object

Eye diagram object, specified as an eyeDiagramSI System object™.

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: t = falltime(obj,PercentReferenceLevel=[20 80]) returns the fall time from the diagram defined from the [80 20] reference levels.

PercentReferenceLevels — Reference levels for fall time

[10 90] (default) | 2-element vector

Reference levels for fall time as a percentage of the waveform amplitude, specified as a 2-element vector. The functions rounds the resulting reference levels to the nearest amplitude bin centers.

Data Types: char

Statelevels — Low and hight state levels

2-element vector

Low and high state levels, specified as a 2-element vector. If no state levels are defined, the function uses the minimum and maximum eye levels.

Data Types: char

Plot — Display measured mean fall time on plot

off (default) | on

Display a plot of the eye diagram showing measured mean fall time.

Data Types: char

Output Arguments

f — Measured fall time

2-element vector

Measured fall time from the eye diagram, returned as a 2-element vector.

lt — Lower threshold crossing time

2-element vector

Lower threshold crossing time relative to the clock edge, returned as a 2-element vector.

ut — Upper threshold crossing time

2-element vector

Upper threshold crossing time relative to the clock edge, returned as a 2-element vector.

ll — Lower reference level amplitude value

scalar

Lower reference level amplitude value, returned as a scalar.

ul — Upper reference level amplitude value

scalar

Upper reference level amplitude value, returned as a scalar.

Version History

Introduced in R2024a