|Home > ATB infrastructure components functional description > About the Trace Port Interface Unit > TPIU pattern generator > Pattern generator modes of operation|
To enable various metrics to be determined, several patterns are supported.
The metrics can include:
When examining the trace port, you can choose from the following pattern modes:
Each pattern runs for a programmable number of traceclkin cycles. After completing the programmed number of cycles, the pattern generator unit reverts to an off state where normal trace is output, assuming trace output is enabled.
The first thing that the trace port outputs after returning to normal trace is a synchronization packet. This behavior is useful with special trace port analyzers and capture devices that are aware of the pattern generator. The TPIU can be set to a standard configuration that the capture device expects. The preset test pattern can then be run, after which the TPA is calibrated ready for normal operation. The TPIU switches to normal operation automatically, without the requirement to reprogram the TPIU.
|Continuous||The selected pattern runs continuously until manually disabled. This behavior is primarily intended for manual refinement of electrical characteristics and timing.|
|Off||When neither of the other two modes is selected, the device reverts to outputting any trace data. After timed operation finishes, the pattern generator reverts to the off mode.|