GS3241 datasheet(15/108 Pages) SEMTECH

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GS3241

Final Data Sheet

Rev.2

PDS-061444

September 2017

15 of 108

Semtech

Proprietary & Confidential

www.semtech.com

4. Detailed Description

4.1 Device Description

The GS3241 features a 75Ω internally terminated Cable Equalizer, which can equalize up

to 190m of Belden1694A cable at 3G. The device includes a CDR which will lock to and

retime valid SMPTE, MADI, and DVB-ASI signals to produce extremely low output jitter,

even at extended cable lengths. The CDR has extensive LBW control to enable jitter

transfer optimization. To facilitate system testing, the device also includes 3D eye

monitor, PRBS7 checker and generator. The two trace drivers have independent

amplitude and pre-emphasis control which can compensate for 14dB of insertion loss at

1.485GHz. The pre-emphasis control is two dimensional in both drivers, where both

pre-emphasis pulse amplitude and width adjustments can be made to help optimize for

interconnect mismatches such as vias and connectors.

4.1.1 Sleep Mode

To enable low power operation, the GS3241 has manual and automatic sleep mode

control.

The default mode is automatic sleep mode on LOS (Loss Of Signal). The device can also

be manually put into sleep mode. When the device is in sleep mode, all the core blocks

are powered down, except the host interface and carrier detect circuits. The trace driver

can be configured to be disabled or muted during sleep.

The CTRL_AUTO_SLEEP and CTRL_MANUAL_SLEEP parameters in register 0x3,

control the sleep mode of the device. The default value of the CTRL_AUTO_SLEEP

parameter is 1b (auto sleep). While in auto sleep mode, the CTRL_MANUAL_SLEEP

parameter has no effect. To enable host control of the sleep mode, set the

CTRL_AUTO_SLEEP parameter to 0b manual sleep control. To prevent the device from

entering sleep, set the CTRL_MANUAL_SLEEP parameter to 0b (not sleep). To manually

configure the device to sleep, set the CTRL_MANUAL_SLEEP parameter to 1b (sleep).

The device can also be manually made to sleep through the GPIO pins. The default GPIO

pin to control sleep is GPIO2 (pin 33). Drive this pin HIGH to make the device sleep.

Section 4.6 describes the PRBS generator function. If the device's PRBS generator is

intended to be used without a valid input signal, the device should be manually set to

not sleep as described above. Without a valid input signal, an LOS status will be

generated and the device will enter sleep mode and the PRBS block will be disabled. For

a description of LOS thresholds and settings, see Section 4.2.3.

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