GS3470 datasheet(28/169 Pages) SEMTECH

28 / 169 page

GS3470

Final Data Sheet

Rev.8

PDS-060500

September 2017

28 of 169

Semtech

www.semtech.com

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.

4.9 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.

4.9.1 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.

4.9.2 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.

When operating in 10-bit mode (20BIT_10BIT = LOW), the output data format is

multiplexed Luma and Chroma data. In this mode, the data is presented on the

DOUT[19:10] pins, with DOUT[9:0] being forced LOW. For SD/ HD data rates, the clock is

either at the 10-bit word rate or at half of this rate (DDR mode). For 3G data rates, the

clock is always at half the 10-bit word rate (DDR mode).

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.

Table 4-4: Lock Detect Conditions (Continued)

Mode of Operation

Mode Setting

Condition for Locked

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