GS6151 datasheet(20/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

20 of 77

Semtech

Proprietary & Confidential

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Figure 4-2: LOS Threshold at 100mV Input Swing vs. SDI Data Rates for a Nominal

DEVICE_SPECIFIC_LOS_THRESHOLD of 53

Strength detection is unaffected by the Trace EQ settings in INPUT_CONTROL_REG_0.

When edge detection is used as the method of LOS detection the corresponding GPIO

pin will be HIGH (signal lost) when no transitions are detected on the selected input. The

corresponding GPIO pin will be LOW (signal present) when transitions are detected on

the input. The LOS status is also available through the LOS bit in the PLL_STATUS

4.3.2 Lock Detection

The GS6151 lock detection circuitry outputs a LOCKED status signal which indicates that

the CDR has achieved phase lock to the incoming data stream. The LOCKED signal is an

active HIGH output available to the application on either of the GPIO[0:1] multi-function

status and control pins. It is selected for output using the GPIO[0:1]_IO_SELECT and

GPIO[0:1]_SELECT bits accessible in the GPIO_CONTROL_REG_0 register. By default,

LOCKED is output on GPIO1.

The LOCKED status is also available from the LOCKED bit in the PLL_STATUS register,

and the LOCK_LOST_STICKY bit in the STICKY_STATUS register indicates whether lock

has been lost since the bit was last cleared.

6G-SDI

3G-SDI

HD-SDI

SD-SDI

1.485

2.97

4.455

5.94

Frequency (Gb/s)

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