PCM4L datasheet(22/38 Pages) RENESAS

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R31DS0087EU0101 Rev.1.01

Page 22

Sep.28.21

pcm4l Datasheet

rerouteFloorDelayThreshold

Seconds

0.000002

This threshold is used to detect floor delay changes in the network.

Valid values: A positive value expressed in seconds.

rerouteAbnormalTodChange

Ppb

This threshold in nanoseconds per second is used to detect fast variations of

ToD.

Valid values: A positive value expressed in nanoseconds per second.

highPrecisionFrequencyCorr

ectionTimeMinutes

This parameter specifies the duration in minutes needed for high precision

frequency estimation.

Valid values: {0 - 200} minutes

pdvThreshold

N/A

This group includes parameters that are used to determine PTSF unusable

based on the log variance of the PDV in downlink and uplink direction. If the log

variance exceeds the PDV threshold, PTSF unusable is set.

downlink {-100 - 0} Log Variance

uplink {-100 - 0} Log Variance

pdvThresholdExceededHyst

eresis

N/A

Once the PDV threshold is exceeded and PTSF is declared unusable, the PDV

log variance must cross below the PDV Threshold minus this group’s value.

downlink {0 - 10} Log Variance

uplink {0 - 10} Log Variance

snapTransitionTimestamps

Number of time stamps that are not usable after a phase (ToD) snap.

Valid values: {0 - 100} Time Stamps

dcoLoopFilter

N/A

This group includes the configuration parameters for the DCO (digital controlled

oscillator) Loop Filter:

Minimum Response Time Seconds is the target duration (in seconds) for the

DCO filter to bring the Time of Day offset back to zero, if the PDV conditions

permit.

Maximum FFO Correction is the absolute value of the maximum allowed FFO

(fractional frequency offset) correction that the proportional branch of the loop

filter can apply to the DCO.

Integral Branch Gain is the gain of the integral branch of the PL loop filter

relative to the proportional branch.

Bandwidth Scalar is the DCO loop filter bandwidth scalar value.

minResponseTimeSeconds {20 - 200} seconds

maxFfoCorrection {1 - 10} parts-per-billion

integralBranchGain {0.0 - 1.0} Gain

bandwidthScalar {0.2 - 2.0} Bandwidth Scalar Value

desiredPrecisionSeconds

0.0000001

Sets the target precision of the ToD offset estimation.

Valid values: {0.000000020 - 0.000000200} Precision in seconds

frequencyLockThresholdPpb

10.0

This is the absolute value of the frequency offset threshold below which the

Frequency Lock is achieved. It is expressed in parts-per-billion.

timeLockThresholdNanosec

onds

1000

This is the absolute value of the ToD offset threshold below which the Time Lock

is achieved. It is expressed in nanoseconds.

ffoSlopeLimitPpbPerSecond

-1.0

Configures whether a frequency slope limit is applied to the desired FFO

correction.

-1 = No limit

{X}: Apply X ppb/s limit on any FFO correction

writePhasePostSnapDelayS

econds

This can be used to avoid snap collisions after a time adjustment has been

made to the clock. This allows for the timestamper(s) to settle before using

ingress/egress timestamps.

Table 12. Reference Tracker Configuration Parameters (Cont.)

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