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GS1661 Datasheet(PDF) 47 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 47 Page - Semtech Corporation |
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47 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 47 of 84 4.12 Automatic Video Standards Detection Using the timing extracted from the received TRS signals, the GS1661 is able to identify the received video standard. The total samples per line, active samples per line, total lines per field/frame and active lines per field/frame are all measured. Four registers are provided to allow the system to read the video standard information from the device. These raster structure registers are provided in addition to the VIDEO_FORMAT_352_A_X and VIDEO_FORMAT_352_B_X registers, and are updated once per frame at the end of line 12. The raster structure registers also contain three status bits: STD_LOCK, INT/PROG and M. The STD_LOCK bit is set HIGH whenever the timing signal generator is fully synchronized to the incoming standard, and detects it as one of the supported formats. The INT/PROG bit is set HIGH if the detected video standard is interlaced and LOW if the detected video standard is progressive. M is set HIGH if the clock frequency includes the “1000/1001” factor denoting a 23.98, 29.97 or 59.94Hz frame rate. The video standard code is reported in the VD_STD bits of the host interface register. Table 4-11 describes the 5-bit codes for the recognized video standards. Table 4-11: Supported Video Standard Codes SMPTE Standard Active Video Area RATE_ DET SD/HD Lines per Frame Active Lines per Frame Words per Active Line Words per Line VD_STD [5:0] 260M (HD) 1920x1035/60 (2:1) 0 1125 1035 1920 2200 15h 295M (HD) 1920x1080/50 (2:1) 0 1250 1080 1920 2376 14h 274M (HD) 1920x1080/60 (2:1) or 1920x1080/30 (PsF) 0 1125 1080 1920 2200 0Ah 1920x1080/50 (2:1) or 1920x1080/25 (PsF) 0 1125 1080 1920 2640 0Ch 1920x1080/30 (1:1) 0 1125 1080 1920 2200 0Bh 1920x1080/25 (1:1) 0 1125 1080 1920 2640 0Dh 1920x1080/24 (1:1) 0 1125 1080 1920 2750 10h 1920x1080/24 (PsF) 0 1125 1080 1920 2750 11h 1920x1080/25 (1:1) – 0 1125 1080 2304 2640 0Eh 1920x1080/25 (PsF) – EM 0 1125 1080 2304 2640 0Fh 1920x1080/24 (1:1) – 0 1125 1080 2400 2750 12h 1920x1080/24 (PsF) – EM 0 1125 1080 2400 2750 13h |
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