GS3590 datasheet(25/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

25 of 118

Semtech

Proprietary & Confidential

www.semtech.com

Figure 4-3: Input Voltage Vs. Carrier Detect Threshold Setting

4.4 Serial Digital Re-timer (CDR)

The GS3590 includes an integrated CDR, whose purpose is to lock to a valid incoming

signal from the Cable Equalizer stage (when operating in cable equalizer mode) or the

Trace Equalizer stage (when operating in cable driver mode) and produce a lower jitter

signal at the Cable Driver or Trace Driver outputs. The CDR has the ability to lock to any

of the following data rates: MADI (125Mb/s), SD-SDI (270Mb/s), HD-SDI (1.485Gb/s), and

3G-SDI (2.97Gb/s). This includes the f/1.001 rates.

The default settings of the re-timer block are optimal for most applications. However,

the following controls allow the user to customize the behaviour of the re-timer: LBW

control, Automatic and Manual Rate Detection.

Note: The parameters referred to within Section 4.4.1 to Section 4.4.2 are linked to their

respective registers in Table 4-4: CDR Control and Status Parameters. For a complete list

of registers and functions, please see Section 5.

100

200

300

400

500

600

700

800

Carrier Detect Threshold Setting

Min Launch Swing vs. CD Threshold Setting

Table 4-2: Trace Equalizer Status and Configuration Parameters

Parameter Name

Description

84, STICKY_ COUNTS_0

STAT_CNT_PRI_CD_CHANGES

A counter showing the number of times the

primary Carrier Detect signal changed.

87, CURRENT_ STATUS_1

STAT_PRI_CD

Primary filtered carrier detect of the

analogue carrier detect signal.

1F, TREQ0_CD_ HYSTERESIS

CFG_TREQ0_CD_ASSERT_THRESH

Sets the Carrier Detect assert threshold.

CFG_TREQ0_CD_DEASSERT_THRESH

Sets the Carrier Detect de-assert threshold.

1E, TREQ0_ INPUT_BOOST

CFG_TREQ0_BOOST

Sets the Trace Equalizer boost level.

CFG_TREQ0_CD_BOOST

Selects the boost method of the CD signal.

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