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GS9090B Datasheet(PDF) 31 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 31 Page - Gennum Corporation |
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31 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 31 of 71 RESTART_PLL signal should be repeated indefinitely as long as LOCKED remains de-asserted. Figure 3-5: GS9090B False Lock Restart Circuit Waveforms of False Lock After Power-up and False Lock After a Signal Switch. 3.7.1 DVB-ASI 8b/10b Decoding The GS9090B will word align the data to the K28.5 sync characters, and 8b/10b decode and bit-swap the data to achieve bit alignment with the data outputs. NOTE: DVB-ASI sync words must be immediately followed by an MPEG packet header for word alignment to correctly function. The extracted 8-bit data will be presented to DOUT [7:0], bypassing all internal SMPTE mode data processing. 3.7.2 Status Signal Outputs In DVB-ASI mode, the DOUT9 and DOUT8 pins will be configured as DVB-ASI status signals WORDERR and SYNCOUT respectively. SYNCOUT will be HIGH whenever a K28.5 sync character is present on the output. WORDERR will be HIGH whenever the device has detected an illegal 8b/10b code word or there is a running disparity error. 3.8 Data-Through Functionality The GS9090B may be configured to operate as a simple serial-to-parallel converter. In this mode, the data is output to the parallel output without performing any decoding, descrambling, or word-alignment. Data-Through functionality is enabled when the AUTO/MAN, SMPTE_BYPASS, and DVB_ASI input pins are set to logic LOW. Under these conditions, the GS9090B allows 270Mb/s input data not conforming to SMPTE or DVB-ASI streams to be reclocked and deserialized. If the device is in Data-Through mode, and the reclocker locks to the data stream, the LOCKED pin will be representative of the serial digital input data frequency. DDI POWER_OK LOCKED RESTART_PLL ~700µs ~20µs ~700µs ~20µs VALID DVB-ASI INPUT SIGNAL VALID DVB-ASI INPUT SIGNAL |
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