Why does the readout value of the counter/timers when used as a logic analyzer trigger event appear incorrect even though the logic analyzer triggered correctly?

Question:

Why does the readout value of the counter/timers when used as a logic analyzer trigger event appear incorrect even though the logic analyzer triggered correctly?

Answer:

Under certain conditions, when a counter/timer is used as a logic analyzer trigger event, the readout value displayed in the Status Monitor is incorrect even though the logic analyzer triggered correctly.

The problem occurs under the following conditions:

The target value of the counter is less than 8 (or the target value of the timer is less than 32 ns); the counter/timer is incremented past the target value; and the counter is reset (or the timer is cleared).

If you need to see the above counter/timer values in the Status Monitor or if you need to use the target values in the Histogram window or with a TPI application, use a second counter/timer in parallel with the first counter/timer, but do not use it in a trigger event. The readout value of the second counter/timer will be correct.

This FAQ Applies to:

Product Series: TLA7000, TLA7000, TLA7000

Product: TLA704, TLA711, TLA714, TLA721, TLA601, TLA602, TLA603, TLA604, TLA611, TLA612, TLA613, TLA614, TLA621, TLA622, TLA623, TLA624, TLA7Q4, TLA7AB4, TLA7N1, TLA7N2, TLA7N3, TLA7N4, TLA7P2, TLA7P4, TLA7Q2, TLA7AA1, TLA7AA2, TLA7AA3, TLA7AA4, TLA7AB2, TLA7L1, TLA7L2, TLA7L3, TLA7L4, TLA7M1, TLA7M2, TLA7M3, TLA7M4, TLA5201, TLA5202, TLA5203, TLA5204, TLA7NA1, TLA7NA2, TLA7NA3, TLA7NA4, TLA7012, TLA7016

FAQ ID : 61426

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