GS3471 datasheet(57/179 Pages) SEMTECH

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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

57 of 179

Semtech

www.semtech.com

By default (after power up or after systems reset), the four

RASTER_STRUC_[4:1]_DS[2:1], VD_STD_DS[2:1], STD_LOCK_DS[2:1], and

INT_PROG_DS[2:1] fields are set to zero. These fields are also cleared when the

SMPTE_BYPASS register is LOW.

4.16 Data Format Detection & Indication

In addition to detecting the video standard, the GS3471 also detects the data format.

This information can be found in the DATA_FORMAT_DS[2:1] registers. Data format

information is only accessible while the device is locked. By default, at power-up, after

reset or while the device is not locked, the DATA_FORMAT_DS[2:1] registers are set to

Fh.

The data format is determined based on the presence of TRS ID words, SDTI header and

TDM header.

Note: In SD video mode only the Y data format register contains the data, and the C

Table 4-12: Data Format Register Codes

YDATA_FORMAT[3:0] or

CDATA_FORMAT[3:0]

Data Format

Remarks

0h to 05h

SDTI

SMPTE ST 321, SMPTE ST 322,



SMPTE ST 326

SDI

—

Reserved

—

TDM

SMPTE ST 346

HD-SDTI

—

Ah to Eh

Reserved

—

Non-SMPTE data format

Detected data format is not SMPTE.



LOCKED = LOW.

Note: This Data Format register is

invalid in SMPTE_BYPASS mode.

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