Motorola MC68306 Betriebsanweisung PDF herunterladen (Seite 40)

Displaying Information

This section describes how to display analyzer configuration information,

state and timing data captured by the preprocessor interface, and symbol

information that has been set up by the preprocessor interface configuration

software.

Unwanted Triggers

The logic analyzer captures prefetches, even if they are not executed. Care

must be taken when you are specifying a trigger condition or a storage

qualification that follows an instruction that may cause branching. An

unused prefetch may generate an unwanted trigger.

Since the microprocessor only prefetches at most one word, one technique to

avoid unwanted triggering from unused prefetches is to add "2" to the trigger

address. This trigger condition will only be satisfied if the branch is not taken.

To display the format specification

• Select the format specification menu for your logic analyzer.

The MC68306 configuration files contain predefined format specifications.

These format specifications include all labels for monitoring the

microprocessor and any coprocessors connected directly to the

microprocessor.

Chapter 3 of this guide contains a table that lists the signals for the MC68306

processor and on which pod and probe line the signal comes to the logic

analyzer. Refer to this table and to the logic analyzer connection information

for your analyzer in chapter 1 to determine where the processor signals

should be on the format specification screen.

For those logic analyzers which have a Clock Period field, the Clock Period field

should remain in the current selection (> 60 ns) to use time-tags. For more

information on the Clock Period field, refer to the reference manual for your

logic analyzer.

MC68306 Preprocessor 2–3

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Motorola MC68306 Betriebsanweisung Seite 40