GS3471 datasheet(22/179 Pages) SEMTECH

22 / 179 page

GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

22 of 179

Semtech

www.semtech.com

Figure 4-2: Flexible Power Down Modes

The device has three other primary modes of operation which include SMPTE mode,

DVB-ASI mode, and Data-Through mode. In SMPTE mode, when receiving a SMPTE

compliant SDI input, the GS3471 performs full SMPTE processing, and features a

number of data integrity checks and measurement capabilities. The device also

supports ancillary data extraction, and can provide entire ancillary data packets through

host-accessible registers. Packet detection and error handling features are also offered.

All processing features are optional, and may be individually enabled or disabled

through register programming. In DVB-ASI mode, sync word detection, alignment, and

8/10bit decoding is applied to the received data stream. While in Data-Through mode,

all forms of SMPTE and DVB-ASI processing are disabled, and the device can be used as

a simple serial to parallel converter.

The GS3471 includes an audio de-embedder and audio clocks are internally generated.

Up to eight channels (two audio groups) of serial digital audio may be extracted from

the video data stream, in accordance with SMPTE ST 272-C and SMPTE ST 299. The

output audio formats supported by the device include AES/EBU and I2S. A variety of

audio processing features are provided to ease implementation.

The GS3471 can equalize 3G SDI, HD-SDI, and SD-SDI serial digital signals, and will

typically equalize up to 200m of Belden 1694A cable at 2.97Gb/s, 280m at 1.485Gb/s,

and 500m at 270Mb/s. When DC-coupling the output of a device to a 1.2V CML load, the

GS3471 typically consumes 300mW of power.

PCLK

PDATA

Mode A: With CSR access

Default: All functions disabled

PDATA

Mode B: PCLK Active

PDATA

Mode C: Retimed Serial Loopback active

PDATA

Mode D: Non-Retimed Serial

Loopback active

PDATA

Mode E: Retimed Loopback and PCLK

locked to selected Input

PDATA

Mode F: Non-Retimed Loopback with

PCLK (not locked) — Manual Rate Select Mode

PCLK

GS3471

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