Freescale Semiconductor Target Interface MMDS0508 - Manual (Page 38)

MMDS Target Componen t
4.10 Bus Analyzer
4–38 MMDS0508 Target Interface
4.10.1.1 Watchpoints
The MMDS0508 automatically maps available watchpoints to a proper bus analyzer
trigger pattern. You may use the bus analyzer to implement watchpoints. If you do,
however, you should not use the bus analyzer for other purposes!
4.10.1.2 Trace Modes
To gather pertinent bus data, you can operate the bus analyzer in different modes. The
various trace modes let you choose appropriate actions to take when a certain pattern
(event), or sequence of patterns, appears on the bus. To trigger the Bus analyzer,
define specific bus states as terms, and select a sequence of terms as a trigger event.
4.10.1.3 Trace Buffer
The trace buffer consists of 8,192 entries (or frames), each of which stores 96 bits.
When the bus analyzer is active and the emulator is running, the system strobes a
frame of the selected type into the trace buffer for each bus cycle. When trigger events
occur in a specified sequence, the system stores only the specified number of
additional frames.
4.10.1.4 Textual or Graphical
The bus analyzer displays data either textually or graphically. Use the horizontal and
vertical scroll bars, as in other Windows applications, to move around the displays.
4.10.2 Using the Bus Analyzer
The bus analyzer functions like any debugger component, and has its own menu to
control the features of the MMDS0508 Bus analyzer hardware. Another name for the
Bus Analyzer window is the Trace window. This is because the bus analyzer
corresponds to the trace component; you can load the bus analyzer by choosing
Open... Trace from the Component menu. Choose the MMDS0508 menu, then select
Bus Trace to open the Trace window (show in
Figure 4.16 ) or the Bus Analyzer
(shown in Figure 4.15 ).
The three steps to using the Bus analyzer are: defining the data collection parameters,
collecting the specified bus data (running the program), and viewing the collected
data.
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