GS12281 datasheet(32/97 Pages) SEMTECH

32 / 97 page

GS12281

Final Data Sheet

Rev.9

PDS-061385

February 2019

32 of 97

Semtech

Proprietary & Confidential

www.semtech.com

Figure 4-8: 4-Point Scan Coordinates Relative to the Eye

The four points obtained from the shape-scan can be used to quickly and easily

calculate the eye height and width of the signal eye. The shape-scan alone will most

likely meet the signal analysis requirements of most applications. Alternatively, the

coordinates obtained from the shape-scan can be used to optimize the bounds of a

partial matrix-scan. The four points returned from the shape-scan are determined by the

error rate threshold set by the error threshold parameter and the time-out parameters

previously discussed.

This section provides a step-by-step procedure to run a matrix and shape-scan. The

shape-scan procedure is described first.

Error Count = Max

> error count threshold

Error Count = 0

Positive Edge

(PE)

Negative Edge

(NE)

Left Edge

(LE)

Right Edge

(RE)

Table 4-6: Time-out Eye Scan Parameters

Parameter Name

Description

56,

EYE_MON_ INT_CFG_2

CFG_EYE_BER_THRESHOLD

Number of sample errors to determine fail

54,

EYE_MON_ INT_CFG_0

CFG_EYE_MON_TIMEOUT_MS

MSB of measurement time in microseconds

55,

EYE_MON_ INT_CFG_1

CFG_EYE_MON_TIMEOUT_LS

LSB of measurement time in microseconds

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