eyeBERLeftApprox

eyeBERLeftApprox(
o_waveform
n_start
n_stop
n_eyePeriod
n_threshold
n_noOfBins
)
=> o_waveform / nil

Description

Returns a waveform representing the left-side bit error rate (BER) curve for the specified eye diagram beyond the output of eyeBERLeft by tail-fitting the left-side cross distribution.

Arguments

o_waveform	The eye diagram waveform.
n_start	Start time of the signal used to create the eye diagram.
n_stop	Stop time of the signal used to create the eye diagram.
n_eyePeriod	Eye period of the eye diagram.
n_threshold	Crossing threshold value on y axis.
n_noOfBins	Number of bins used to create histograms of crossing data.

Value Returned

o_waveform	Waveform representing the left-side bit error rate (BER) curve for the specified eye diagram.
nil	The specified eye diagram does not exist or the output waveform cannot be returned because of an error.

Examples

The following example creates an eye diagram from a jitter signal with time from 200n to 400u and an eye period of 80n.

eye=eyeDiagram(v("jitter" ?result "tran-tran" ?resultsDir "/servers/user/design/prbs.raw") 200n 400u 2*40n   ?autoCenter t )

=> srrWave:0x336321b0

The following example returns the waveform representing the left-side bit error rate (BER) curve for the specified eye diagram beyond the output of eyeBERLeft by tail-fitting the left-side cross distribution.

w1=eyeBERLeftApprox(eye 200n 400u 80n 0.5 50)

=> srrWave:0x33632420

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