GS12281 datasheet(28/97 Pages) SEMTECH

28 / 97 page

GS12281

Final Data Sheet

Rev.9

PDS-061385

February 2019

28 of 97

Semtech

Proprietary & Confidential

www.semtech.com

4.5.1 Shape Scan and Measurement Time

Figure 4-6: Eye Scan Matrix Parameters

Figure 4-6 shows a visual representation of the scan matrix and indicates the spatial

parameters that determine the scan area and resolution. Running a scan using the

default offset and step parameters, results in 32768 (128x256) samples. The number of

samples and thus, the total scan time can be reduced to meet the needs of the

application. The scan area can be reduced by reducing the span determined by the

vertical and phase start and stop offsets, or the resolution can be reduced by increasing

the step size between adjacent samples. On the right in Figure 4-6, there are three step

settings used as examples, however there are a total of nine combinations possible. See

Table 4-5 for the register addresses and parameter names of the spatial eye scan

parameters.

For example, by increasing the vertical and phase step size to 4, the resolution is

reduced to (1/4)2, thus reducing the number of samples down to 2048 (32768x1/16).

128

Max Horizontal Scan Resolution

127

255

Phase Start

Phase Stop

Vertical

Offset Start

Vertical

Offset Stop

Vertical Offset Step = 1

Phase Step = 1

Vertical Offset Step = 2

Phase Step = 1

Vertical Offset Step = 4

Phase Step = 4

Default

Vertical

Offset

Start

Default

Vertical

Offset

Stop

Default

Phase

Start

Default

Phase

Stop

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