GS3281 datasheet(23/97 Pages) SEMTECH

23 / 97 page

GS3281

Final Data Sheet

Rev.7

PDS-061453

January 2019

23 of 97

Semtech

Proprietary & Confidential

www.semtech.com

4.4.2 Continuous PRBS Check Measurement Procedure

As previously mentioned, the maximum measurement time for a timed PRBS error

measurement is ~3.35 seconds. For links with very low error rates, this time is insufficient

to capture an adequate number of errors. For these situations, the continuous PRBS

check measurement is more appropriate.

In continuous PRBS measurement mode, the measurement can run as long as required

(assuming the device remains locked) to ensure the BER test level is met.

To perform a continuous PRBS measurement, please follow the steps outlined in the

flowchart found within Figure 4-4: Continuous PRBS Check Flow.

Table 4-4: PRBS Checker Parameter Description

and Name

Parameter Name

Description

50,

PRBS_ CHK_CFG

CFG_PRBS_CHECK_PREDIVIDER

Selects pre-divider for PRBS check measurement timer.

CFG_PRBS_CHECK_MEAS_TIME

Selects PRBS check measurement interval for timed

measurements.

51,

PRBS_CHK_ CTRL

CTRL_PRBS_CHECK_TIMED_CONT_B

Selects between timed and continuous type PRBS

measurement.

TRL_PRBS_CHECK_START

Used to start and stop PRBS measurements.

89,

PRBS_ CHK_ ERR_CNT

STAT_PRBS_CHK_ERR_CNT

PRBS error count storage location.

8A,

PRBS_ CHK_STATUS

STAT_PRBS_CHECK_STATUS

Status indication of PRBS checker.

STAT_PRBS_CHECK_LAST_ABORT

Indication bit for PRBS successful completion or abort.

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