GS12090 datasheet(21/121 Pages) SEMTECH

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GS12090

Final Data Sheet

Rev.9



PDS-061188

November 2018

21 of 121

Semtech

Proprietary & Confidential

www.semtech.com

With the default values in place:

 An assertion (setting HIGH) of STAT_PRI_CD will take place after a valid signal is

present for ~6.5ms

 A de-assertion (setting LOW) of STAT_PRI_CD will take place after loss of a valid

signal for ~96μs

If the application requires any adjustment of the sampling window, assertion count, or

de-assertion count, please consult the following equations to calculate the associated

time to assert or de-assert STAT_PRI_CD.

STAT_PRI_CD de-assert time:

 (1.6μs) * (CFG_CD_FILTER_SAMPLE_WIN + 1) * CFG_CD_FILTER_DEASSERT_CNT



STAT_PRI_CD assert time:

 (1.6μs) * (CFG_CD_FILTER_SAMPLE_WIN + 1) * CFG_CD_FILTER_ASSERT_CNT

Figure 4-1: STAT_PRI_CD Configuration Parameters

4.2.3.2 Secondary Carrier Detection (STAT_SEC_CD) Configuration

The secondary carrier detection signal acts as an additional carrier detection which can

be further filtered through squelch controls. It also serves as the control signal for Mute

on LOS (Loss Of Signal) and Disable on LOS. Please refer to Section 4.8.6 to

Section 4.8.6.3 for further information on this.

If the application requires the use of squelch settings, start by setting the following:

 CFG_SEC_CD_INCL_CLI_SQUELCH = 1

Once this parameter is set, the device will apply squelch based on the settings found

within the following parameters:

 CFG_CLI_SQUELCH_THRESHOLD

Time in clock cycles

CFG_CD_FILTER_SAMPLE_WIN

CFG_CD_FILTER_ASSERT_CNT =n

n=1

n=2

n=3

…

CFG_CD_FILTER_DEASSERT_CNT =n

n=1

n=2

n=3

…

= ASSERT Threshold

= DEASSERT Threshold

Time in clock cycles

CFG_CD_FILTER_SAMPLE_WIN

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