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S100 User Guide – Rev. D – June 2005 71
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Disc Control - Short for disciplining control, this disciplining function is the part of the
software that matches the local clock phase and frequency with the selected time reference
function.
Phase Control - Short for local clock phase shifting, this function shows if the software is
shifting the one-second rollover point of the local hardware clock by a specified amount.
Disc Gain - Short for oscillator disciplining function gain value, this is a scalar value that
sets the gain for the Kalman filter so it can discipline the local oscillator to the selected time
reference.
Control Settings
The timing engine control settings are viewable here.
They are:
HeartBeat Mode - The heartbeat is the specified frequency.
HeartBeat Counter1 and 2 - These are internal counters to the timing engine.
Frequency Output - The available frequencies are 1, 5, and 10 MHz.
Event Control - This setting enables or disables the ability of the internal clock to capture the
time at which an external event occurs.
Event Edge - This is either the rising or falling edge of the heartbeat signal.
Event Capture Lockout - If enabled, the capture lockout can be used to control whether or
not subsequent signals will overwrite the data in the timing engine’s event time registers.
Event Capture Source - This setting controls the source of the external event—an external
event input or strobe, for example.
Figure 4-20: Control Settings