GS9090 Data Sheet
3.5 Modes Of Operation
The GS9090 has two basic modes of operation: Auto mode and Manual mode.
Auto mode is enabled when the application layer sets the AUTO/MAN pin HIGH,
and Manual mode is enabled when the AUTO/MAN pin 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 GS9090 is in Manual
mode.
SMPTE Functionality
Auto Mode
DVB-ASI Functionality
GS9090
SMPTE Functionality
Manual Mode
DVB-ASI Functionality
Data-Through
Functionality
Figure 3-1: GS9090’s Modes of Operation
3.5.1 Lock Detect
Once the internal reclocker has locked to the received serial digital data stream,
the lock detect block of the GS9090 searches for the appropriate sync words, and
indicates via the LOCKED output pin when the device has successfully achieved
lock. The LOCKED pin is designed to be stable. It will not toggle during the locking
process, nor will it glitch during a synchronous switch.
Lock detection is a continuous process, which begins after a system reset and
continues until the device is powered down or held in reset. This process is
summarized in Figure 3-2.
28201 - 1 July 2005
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GENNUM [ GENNUM CORPORATION ]
