Freescale Semiconductor MMDS0508 manual Viewing Collected Data, Recording Bus Data, Trigger Event

Freescale Semiconductor, Inc.

MMDS Target Component

4.10 Bus Analyzer

4.10.3.7 Recording Bus Data

When data collection begins, the bus analyzer starts recording bus data into the buffer. When it reaches the end of the buffer, the Bus analyzer wraps around to the first buffer frame and continues recording. This process continues until you disarm the analyzer, until the analyzer records the specified number of frames, or until the analyzer records the specified number of post-trigger cycles following the trigger event.

4.10.3.8 Trigger Event

When the analyzer detects a trigger event, it latches the event cycle into the buffer and continues recording data until it collects the specified number of post-trigger cycles. Then the bus analyzer stops collecting data, and its status changes to Disarmed.

At the same time the analyzer records the first post-trigger cycle, it automatically begins searching for the next trigger event.

Subsequent events can occur while the bus analyzer collects post-trigger cycles for the first event. In such a case, the analyzer continues collecting post-trigger cycles, but marks the cycles for the subsequent events.

4.10.4 Viewing Collected Data

4.10.4.1 View Cycles

The bus analyzer provides several views of the collected cycles. At the end of cycle collection, the trace buffer contains as many as 8192 of the most recently stored frames. Those that have the highest numbers usually are the post-trigger frames. Those that have the lowest numbers are the frames stored before the trigger occurred, if any.

When the bus analyzer is not in the Analyzing state, it displays data in the Trace window.

4.10.4.2 Textual, Graphical or Instructions

To specify the type of bus-data display, select Textual, Graphical, or Instructions from the Trace popup menu.

	NOTE	If the sequencer did not specify collection of all frames (for example,
		if it specified an events-only mode) the menu may not include the
		Instructions selection.
MMDS0508 Target Interface		4–47

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