4-10 Theory of Operation
4.6.1.5.1.3 TDC – The HTB645 has an internal TDC and
the ability to drive an external TDC. The TDC
resolution is ≈1.4ps.
4.6.1.5.1.4 Timebase – Provides control of starting and
stopping individual acquisition segments.
4.6.1.5.1.5 Miscellaneous clocks – provides 125MHz
clock for the NCO and the probe cal generator.
4.6.1.5.2 MST429A – Smart Trigger IC
4.6.1.5.2.1 Signal I/O – there are 6 differential ECL trigger
inputs, 6 differential ECL validate inputs and 2
single ended ECL inputs
4.6.1.5.2.2 Trigger Functions
• edge trigger
• timeout trigger
• pulse width trigger
• interval width trigger
• setup and hold time violation trigger
4.6.1.5.2.3 Main trigger delay or holdoff selection
• trigger delayed by time
• trigger holdoff by time
• trigger delayed by events
• trigger delayed by events and time
• trigger holdoff by events and time
• trigger delayed by time and events
4.6.1.5.2.4 Qualifier selection
• gate qualifier
• state qualifier
• edge qualifier
• number of events qualifier
• state with specified delay qualifier
• edge with restartable delay qualifier
• edge with not restartable delay qualifier
• pulse width qualifier
• interval width qualifier
4.6.1.5.2.5 Polarity – Polarity selection for trigger and
qualifier (positive, negative or either)
4.6.1.5.2.6 Analog Time Measure – Analog time measure
system used for specific trigger and qualifier
from 500ps to 10ns with 250ps resolution, and
from 10ns to 100ns with 500ps resolution
4.6.1.5.2.7 Digital Time Measure – Digital time measure
system used for specific trigger and qualifier
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