GS3471 datasheet(32/179 Pages) SEMTECH

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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

32 of 179

Semtech

www.semtech.com

4.10 Lock Detect

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

conditions:

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

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

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

Note: In Power-down mode with RC_BYP disabled, the PLL unlocks. However, the

LOCKED signal retains whatever state it previously held. For instance, if before

power-down assertion the LOCKED signal is HIGH, during power-down it will remain

HIGH regardless of the status of the PLL.

4.11 Parallel Data Outputs

A 20-bit parallel bus is available which can be configured in 10-bit or 20-bit mode.The

parallel data outputs are aligned to the rising edge of the PCLK.

4.11.1 Parallel Data Bus Output Levels

The parallel data bus supports 1.8V or 2.5V (LVTTL and LVCMOS levels) supplied at the

IO_VDD pins.

4.11.2 Parallel Output in SMPTE Mode

When the device is operating in SMPTE mode (SMPTE_BYPASS = HIGH), data is output

in either multiplexed or demultiplexed form depending on the setting of the

20BIT_10BIT pin or PIN_CSR_SELECT register (877h).

When operating in 20-bit mode (20BIT_10BIT = HIGH), the output data is demultiplexed

Luma (DOUT[19:10]) and Chroma (DOUT[9:0]) data for SD and HD data rates. For 3G data

rate, Data Stream 1 is output on the DOUT[19:10] pins and Data Stream 2 is output on

the DOUT[9:0] pins.

Table 4-5: Lock Detect Conditions

Mode of Operation

Mode Setting

Condition for Locked

SMPTE Mode

SMPTE_BYPASS = HIGH

DVB_ASI = LOW

Retimer PLL is locked to valid

SMPTE video.

DVB-ASI Mode

SMPTE_BYPASS = LOW

DVB_ASI = HIGH

Retimer PLL is locked to a DVB-ASI

stream.

Data-Through Mode

SMPTE_BYPASS = LOW

DVB_ASI = LOW

Retimer PLL is locked.

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