GS3590 datasheet(35/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

35 of 118

Semtech

Proprietary & Confidential

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In addition to the spatial parameters, the sample time, and thus the bit error rate

resolution for the eye scan can be adjusted; longer scans can detect finer bit error rates.

However, this proportionally increases the total scan time. The sample time in

microseconds is determined by a 32-bit time-out value split across two 16 bit registers.

See Table 4-7 for the register addresses and parameter names of the time-out eye scan

parameters.

For example, using the default spatial and temporal measurement scan parameters, the

scan time is approximately 6.6 seconds (32768 x 2 x 100μs). However, by changing the

vertical and horizontal step size to 4, the scan time can be reduced to 400ms (2048 x 2 x

100μs).

The error count information can be used as is to determine the minimum inner contour

based on the measurement time. However, the basic data can be post processed to

determine things like error rate, and error threshold. The following equations provide

guidance for user post-processing:

Equation 4-1

Contour maps can be created by defining error rate thresholds, and grouping sampled

points that fall between thresholds.

For example:

Equation 4-2

Some sampling scopes provide eye maps with BER contours; similar limited BER contour

approximations can be obtained from the eye scan by using BER threshold groups.

For example:

Equation 4-3

error

1rate

sample

1error1count

sample

1time

--------------------------------------------------------------

sample

1time

error

1rate1threshold11

------------------------------------------------------------------------ sample1error1threshold

sample

1time

error

1rate1threshold12

------------------------------------------------------------------------



sample

1time1x1data1rate

error

1rate1threshold11

------------------------------------------------------------------------------- sample1error1threshold sample1time1x1data1rate

error

1rate1threshold12

-------------------------------------------------------------------------------



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