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GS9090B Datasheet(PDF) 23 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 23 Page - Gennum Corporation |
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23 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 23 of 71 3.3 Clock and Data Recovery The GS9090B contains an integrated clock and data recovery block. The function of this block is to lock to the input data stream, extract a clean clock, and retime the serial digital data to remove high frequency jitter. 3.3.1 Internal VCO and Phase Detector The GS9090B uses an internal VCO and PFD as part of the reclocker's phase-locked loop. Each block requires a +1.8V DC power supply, which is supplied via the VCO_VDD / VCO_GND and PLL_VDD / PLL_GND pins. 3.4 Serial-To-Parallel Conversion The retimed data and phase-locked clock signals from the reclocker are fed to the serial-to-parallel converter. The function of this block is to extract 10-bit parallel data words from the reclocked serial data stream and simultaneously present them to the SMPTE and DVB-ASI word alignment blocks. 3.5 Modes Of Operation The GS9090B has two basic modes of operation: Auto mode and Manual mode. Auto mode is enabled when AUTO/MAN is set HIGH, and Manual mode is enabled when AUTO/MAN is set LOW. As indicated in Figure 3-1, each mode supports both SMPTE and DVB-ASI input signals. In addition, Data-Through functionality is possible when the GS9090B is in Manual mode. In Auto mode (AUTO/MAN = HIGH), the GS9090B will automatically detect, reclock, deserialize, and process SMPTE 259M-C, or DVB-ASI input data. In Manual mode (AUTO/MAN = LOW), the SMPTE_BYPASS and DVB_ASI pins must be set as per Table 3-2 for the correct reception of either SMPTE or DVB-ASI data. Manual mode also supports the reclocking and deserializing of 270Mb/s data not conforming to SMPTE or DVB-ASI streams. |
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