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Event Counters

Event Counters. Some Typical Instrument Requirements. High frequency counting Very narrow pulse widths Can’t sample with a clock Many channels Number of channels exceeds low-skew resources Compact Low Power No rollover errors. “Saturating Counter”.

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Event Counters

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  1. Event Counters

  2. Some Typical Instrument Requirements • High frequency counting • Very narrow pulse widths • Can’t sample with a clock • Many channels • Number of channels exceeds low-skew resources • Compact • Low Power • No rollover errors

  3. “Saturating Counter” High-speed asynchronous pulses are input into a set of counters. To preserve information, the counter is not allowed to rollover but must lock at its highest value. There are many implementatins of high-speed counters.

  4. Saturating Counter ExampleSchematic View Note: 9 flip-flops for this 8-bit counter.

  5. Saturating Counter ExampleSchematic View: Counting Mechanism

  6. Saturating Counter ExampleSchematic View: Saturating Mechanism Equivalent to a software sentinel

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