GS3471 datasheet(27/179 Pages) SEMTECH

27 / 179 page

GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

27 of 179

Semtech

www.semtech.com

When EQ LOS Filter is disabled, EQ LOS will be asserted (set to 1) no less than 10μs and

no longer than 40μs after the loss of a valid input signal, and will be de-asserted (set to

0) no more than 5μs after the connection of a valid input signal.

SP (Signal Presence; opposite polarity of LOS) is available via a status bit in

STATUS_REG_0. The EQ LOS is available on the STAT[5:0] outputs. Refer to Figure 4-5.

4.3.3.1 Programmable EQ LOS Filter

The EQ LOS Filter delays notification of the change in raw EQ LOS until the new state

persists contiguously for the programmed length of time. This increases stability of EQ

LOS signalling.

The EQ LOS Filter assertion and de-assertion delays can be programmed through the

GS3471 host interface. By default, the EQ LOS Filter is set to 51.8μs assertion delay and

6.6ms de-assertion delay.

The EQ LOS assertion delay can be set in the range from 0ms to 6.6ms in increments of

25.9μs. The EQ LOS de-assertion delay can be set in the range of 0s to 1.7s in increments

of 6.6ms. These parameters are accessible using the EQ_LOS_FILTER_SET_DELAY and

EQ_LOS_FILTER_CLEAR_DELAY bits in EQ_LOS_FILTER_CONF_REG_0

The use of these parameters can be disabled using the EQ_LOS_FILTER_DISABLE bit in

EQ_LOS_FILTER_CONF_REG_1. Figure 4-4 below shows the derivation of the EQ LOS

status indication, and how the EQ LOS Filter affects the output.

Figure 4-4: Factors Affecting the Assertion of the LOS Status Parameter

4.3.3.2 EQ_STAT Output Muxing

The GS3471 reports the status of carrier detect and loss of signal on the equalized input

via EQ_STAT. The output can be Carrier Detect, Loss of Signal, or a combination of

Carrier Detect and Rate Detect, as shown in Figure 4-5. EQ_STAT is available on the

STAT[5:0] outputs.

EQ LOS Filter

Raw EQ LOS

LOS_FILTER_DISABLE

EQ LOS (Status Parameter)

EQ_LOS_FILTER_SET_DELAY

EQ_LOS_FILTER_CLEAR_DELAY

CARRIER DETECT

Set to 1 when any of the following:

EQ SLEEP, EQ AUTO_SLEEP,

EQ BYPASS

Combination of CARRIER DETECT

and SQUELCH

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