GS9090B Datasheet, PDF (23/72 Pages) Gennum Corporation – GenLINX® III 270Mb/s Deserializer for SDI

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. DVB_ASI and data-through are only
supported in Manual mode.
In Auto mode (AUTO/MAN = HIGH), the GS9090B will automatically detect, reclock,
deserialize, and process SMPTE 259M-C 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.
GS9090B GenLINX® III 270Mb/s Deserializer for SDI
Data Sheet
40749 - 5
May 2010
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