GS1671 datasheet(31/130 Pages) SEMTECH

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GS1671 HD/SD SDI Integrated Receiver

Data Sheet

53737 - 2

September 2012

31 of 130

4.6 Lock Detect

The LOCKED output signal is available by default on the STAT3 output pin, but may be

programmed to be output through any one of the six programmable multi-functional

pins of the device; STAT[5:0].

The LOCKED output signal is set HIGH by the Lock Detect block under the following

conditions:

NOTE 1: The part will lock to ASI in Auto mode, but could falsely unlock for some ASI

input patterns.

NOTE 2: In Standby mode, the reclocker PLL unlocks. However, the LOCKED signal

retains whatever state it previously held. So, if before Standby assertion, the LOCKED

signal is HIGH, then during standby, it remains HIGH regardless of the status of the PLL.

4.6.1 Asynchronous Lock

The lock detection algorithm is a continuous process, beginning at device power-up or

after a system reset. It continues until the device is powered down or held in reset.

The device first determines if a valid serial digital input signal has been presented to the

device. If no valid serial data stream has been detected, the serial data into the device is

considered invalid, and the LOCKED signal is LOW.

XTAL1 to XOUT Prop. Delay

(High to Low)

1.3

1.5

2.3

XTAL1 to XOUT Prop. Delay

(Low to High)

1.3

1.6

2.3

NOTES:

Valid when the cell is used to buffer an external clock source which is connected to the XTAL1 pin, then nothing should be

connected to the XTAL2 pin.

Table 4-3: Input Clock Requirements (Continued)

Parameter

Min

Typ

Max

UOM

Notes

Table 4-4: Lock Detect Conditions

Mode of Operation

Mode Setting

Condition for Locked

Data-Through Mode

SMPTE_BYPASS = LOW

DVB_ASI = LOW

Reclocker PLL is locked.

SMPTE Mode

SMPTE_BYPASS = HIGH

DVB_ASI = LOW

Reclocker PLL is locked

2 consecutive TRS words are detected

in a 2-line window.

DVB_ASI Mode

SMPTE_BYPASS = LOW

DVB_ASI = HIGH

Bit AUTO/MAN = LOW

Reclocker PLL is locked

32 consecutive DVB_ASI words with

no errors are detected within a

128-word window.

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