GS2972 Datasheet, PDF (30/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

4. Detailed Description
4.1 Functional Overview
The GS2972 is a Multi-Rate Transmitter with integrated SMPTE digital video processing
and an integrated Cable Driver and embedded Audio Multiplexer. It provides a
complete transmit solution at 2.970Gb/s, 2.970/1.001Gb/s, 1.485Gb/s, 1.485/1.001Gb/s
or 270Mb/s.
The device has four basic modes of operation that must be set through external device
pins: SMPTE mode, DVB-ASI mode, Data-Through mode and Standby mode.
In SMPTE mode, the device will accept 10-bit multiplexed or 20-bit demultiplexed
SMPTE compliant data. By default, the device's additional processing features, including
audio embedding, will be enabled in this mode.
In DVB-ASI mode, the GS2972 will accept an 8-bit parallel DVB-ASI compliant transport
stream on DIN[17:10]. The serial output data stream will be 8b/10b encoded with
stuffing characters added as per the standard.
Data-Through mode allows for the serializing of data not conforming to SMPTE or
DVB-ASI streams. No additional processing will be done in this mode.
In addition, the device may be put into Standby, to reduce power consumption.
The serial digital output features a high-impedance mode and adjustable signal swing.
The output slew rate is automatically set by the RATE_SEL0 and RATE_SEL1 pin setting.
The GS2972 provides several data processing functions; including generic ANC
insertion, SMPTE ST 352 and EDH data packet generation and insertion, automatic video
standards detection, and TRS, CRC, ANC data checksum, and line number calculation
and insertion. These features are all enabled/disabled collectively using the external I/O
processing pin, but may be individually disabled via internal registers accessible
through the GSPI host interface.
Finally, the GS2972 contains a JTAG interface for boundary scan test implementations.
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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