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GS2970A Datasheet(PDF) 29 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 29 Page - Semtech Corporation |
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29 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 29 of 150 4. Detailed Description 4.1 Functional Overview The GS2970A is a multi-rate, multi-standard receiver with integrated SMPTE video processing as well as an integrated audio de-embedder, compliant with SMPTE 425M, SMPTE 424M, SMPTE 292 and SMPTE 259M-C signals. When used in conjunction with Semtech's 3Gb/s-capable equalizers, a complete receive solution that supports full bandwidth 1080p video at 2.97Gb/s can be realized. The GS2970A includes an integrated reclocker, serial data loop through output, robust serial-to-parallel conversion, integrated SMPTE video processing, and additional processing functions such as audio extraction, ancillary data extraction, EDH support, and DVB-ASI decoding. The device supports four distinct modes of operation that can be set through external device pins or by programming internal registers through the host interface; SMPTE mode, Data-Through mode, DVB-ASI mode and Standby mode. In SMPTE mode, all video processing features, ancillary data extraction, and audio de-embedding features are enabled by default. In DVB-ASI mode, the GS2970A carries out 8b/10b decoding and generates 10-bit parallel DVB-ASI compliant data. In Data-Through mode, the device operates as a simple serial to parallel converter. No additional processing features are enabled. Standby mode is the low power consumption mode of the device. In this mode, the internal reclocker will unlock, and the internal configuration registers will not be accessible through the host interface. The GS2970A includes a JTAG interface for boundary scan testing. 4.2 SMPTE 425M Mapping - 3G Level A and Level B Formats 4.2.1 Level A Mapping Direct image format mapping - the mapping structure used to define 1080p/50/59.94/60 4:2:2 YCbCr 10 bit data, as supported by the GS2970A. See Figure 4-1: Figure 4-1:Level A Mapping Data Stream 1 Data Stream 2 EAV HANC SAV Active Video |
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