GS6151 datasheet(44/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

44 of 77

Semtech

Proprietary & Confidential

www.semtech.com

are used to operate the Input PRBS checker (and in fact Input PRBS checking is

automatically performed by the device when an Arbitrary Data eye scan or error check

is performed) the user is referred to the previous section for details on programming the

HEM. PRBS-specific registers which are additionally set or observed and their Arbitrary

Data equivalents are given in Table 4-9 below.

The eye bitmap registers in EYE_MON_STATUS_REG_4… EYE_MON_STATUS_REG_11

can be set to provide the bitmap when the PRBS checker is used as the criteria for bit

errors when the EYE_MON_SELECT bit is set to 0 (PRBS7 bit stream).

Due to the nature of the PRBS polynomial an input without data transitions may be

detected as error-free. To circumvent this possibility the EYE_MON_PRBS_NODATA bit

of the EYE_MON_STATUS_REG_12 register indicates if no data transitions have been

detected if the bit remains high after the EYE_MON_PRBS_NODATA_SET bit of the

EYE_MON_ENABLE register has been toggled high, then low.

4.12.2.2 Re-timed Data PRBS Checker

The re-timed bit stream is checked using a separate PRBS checker which is controlled

and checked with separate registers from either the arbitrary eye monitor or Input

PRBS7 checker and is enabled by setting the PRBS_MON_ENABLE bit of the

PRBS_CHK_CTRL register and controlled with registers PRBS_CTRL_0 …, PRBS_CTRL_8.

The results are stored in PRBS_STATUS_REG_0 and PRBS_STATUS_REG_1. The operation

of the Re-timed Data PRBS checker is very similar to the Arbitrary Data HEM and Input

PRBS checker and the user is referred to the previous sections for equivalent registers

are given in Table 4-10 below.

Table 4-9: Arbitrary Data Checker Registers and Equivalent Input PRBS7 Checker Registers

Arbitrary Data Checker

Input PRBS7 Checker

Parameter

Does Not Apply

EYE_MON_ENABLE

EYE_MON_PRBS_NODATA_SET

EYE_MON_CONTROL_REG_4

ERROR_THRESHOLD

EYE_MON_CONTROL_REG_3

EYE_MON_PRBS_ERROR_

THRESHOLD

EYE_MON_CONTROL_REG_6

EYE_MON_WINDOW

Does Not Apply

EYE_MON_CONTROL_REG_6

EYE_MON_FORCE_CLEAR

EYE_MON_CONTROL_REG_6

EYE_MON_PRBS_FORCE_CLEAR

EYE_MON_CONTROL_REG_6

EYE_MON_CLEAR

EYE_MON_CONTROL_REG_6

EYE_MON_PRBS_CLEAR

EYE_MON_STATUS_REG_2

STARTING_PHASE

EYE_MON_STATUS_REG_0

EYE_MON_PRBS_STARTING_

PHASE

EYE_MON_STATUS_REG_2

EYE_WIDTH

EYE_MON_STATUS_REG_0

EYE_MON_PRBS_EYE_WIDTH

EYE_MON_STATUS_REG_2

ERROR_COUNT

EYE_MON_STATUS_REG_1

EYE_MON_PRBS_ERROR_COUNT

Does Not Apply

EYE_MON_STATUS_REG_12

EYE_MON_PRBS_NODATA

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