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Measurement example using all three trace modes
In a 32-bit microprocessor system, you want to determine how efficiently the
CPU is being utilized. Critical questions might be: are any processes
consuming excessive processing time, are any processes getting stuck in wait
loops, and is the system handling service calls and interrupts efficiently?
You connect the HP logic analyzer to the address bus of your system. In the
Format menu, you define a 32-bit label called ADDR and the state clocking.
In many cases, HP provides preprocessors, inverse assemblers and standard
configurations for popular microprocessors, and you need not enter the
configuration manually or worry about probing issues.
In the State Overview mode, you select the ADDR label and start the
acquisition to monitor the entire memory space. After several acquisitions,
five areas of relatively high activity begin to build on the histogram. Using
the X and O markers to determine the address boundaries of these five
regions, you quickly recognize two programs, a delay routine in the operating
system kernel, and a keyboard interrupt routine. The figure below shows the
State Overview display.
SPA State Overview
The SPA Menu
SPA Measurement Processes
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