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GS3281 Datasheet(PDF) 30 Page - Semtech Corporation |
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GS3281 Datasheet(HTML) 30 Page - Semtech Corporation |
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30 / 97 page ![]() GS3281 Final Data Sheet Rev.7 PDS-061453 January 2019 30 of 97 Semtech Proprietary & Confidential www.semtech.com Figure 4-7: Full Matrix Scan (left) and Partial Matrix Scan (right) Figure 4-7 illustrates an example of an eye scan, where the sampled eye data is not centred within the scan matrix. The eye scan data has an arbitrary centre phase relative to the centre of the matrix which is determined when the eye monitor is powered up. While the eye monitor remains powered, subsequent scans will maintain the same relative phase allowing for consecutive scans to be compared for changes. Although the scan data is not centred, a simple algorithm can be applied to the data to shift the eye data and extract the relevant information. In addition to the matrix-scan, the eye monitor includes a built-in function called a shape-scan. The shape-scan returns four coordinates corresponding to the horizontal and vertical extremes of the inner eye (See Figure 4-8). 1 st Partial Scan 2 nd Partial Scan ... Partial Scan ... Partial Scan ... Partial Scan ... Partial Scan ... Partial Scan ... ... Partial Scan ... Partial Scan ... Partial Scan ... Partial Scan 128 th Partial Scan Phase Start Phase Stop Vertical Offset Start Vertical Offset Stop 1 st Partial Scan 1 st 1 st 2 nd 2 nd 2 nd 2 nd ... ... ... ... Last Last Error Count = Max 0 <Error Count < Max Error Count = 0 |
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