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GS2970A Datasheet(PDF) 63 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 63 Page - Semtech Corporation |
63 / 150 page ![]() GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 63 of 150 By default (at power up or after system reset), the DATA_FORMAT_DSX register is set to Fh (undefined). This register is also set as undefined when the LOCKED signal is LOW and/or the SMPTE_BYPASS pin is LOW. The data format is determined using the following criteria: • If TRS ID words are detected but no SDTI header or TDM header is detected, then the data format is SDI • If TRS ID words are detected and the SDTI header is available then the format is SDTI • If TRS ID words are detected and the TDM data header is detected then the format is TDM video • No TRS words are detected, but the PLL is locked, then the data format is unknown NOTE: Two data format sets are provided for HD video rates. This is because the Y and Cr/Cb channels can be used separately to carry SDTI data streams of different data formats. In SD video mode, only the Y data format register contains the data, and the C register is set to Fh (undefined format). 4.15 EDH Detection 4.15.1 EDH Packet Detection The GS2970A determines if EDH packets are present in the incoming video data and asserts the EDH_DETECT status according to the SMPTE standard. EDH_DETECT is set HIGH when EDH packets have been detected and remains HIGH until EDH packets are no longer present. It is set LOW at the end of the vertical blanking (falling edge of V) if an EDH packet has not been detected during vertical blanking. EDH_DETECT can be programmed to be output on the multi-function output port pins. The EDH_DETECT bit is also available in the host interface. Table 4-12:Data Format Register Codes YDATA_FORMAT[3:0] or CDATA_FORMAT[3:0] Data Format Remarks 0h ~ 05h SDTI SMPTE 321M, SMPTE 322M, SMPTE 326M 6h SDI − 7h Reserved − 8h TDM SMPTE 346M 9h HD-SDTI − Ah ~ Eh Reserved − Fh 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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