Grass Valley 8936 User Manual
Page 17
8936 Instruction Manual
11
Functional Description
The Parallel Clock Frequency Detection block detects the rate of the signals
coming from the parallel clock signal. This information is then fed to the
PLD (Programmable Logic Device) block.
A ten-bit parallel stream from the Deserializer is fed to the TRS (Timing
Reference Signal) Detection block. The output of the TRS detector switches
to a logic high for one parallel clock period whenever the TRS is detected.
It then feeds a one shot which holds the TRS pulse for a duration of 14 TRS
pulses. If 15 consecutive TRS pulses are not detected, the output will go to
a logic zero.
The PLD Logic block controls the mode selection (automatic or manual). It
also controls the health alarm outputs and the signal present indicator
LEDs.
The 5V Switching Regulator block provides the + 5V for the module.
Power Supply Monitoring is provided to monitor + 12V, – 12V, and 5V DC
signals. It also alerts the health alarm signal if any voltage drops enough to
cause circuit malfunction.
Note
Module health (alarm) monitoring requires that the Controller module be
installed in the frame.