Generation of trace signals within a data processing apparatus

Details Generation of trace signals within a data processing apparatus Generation of trace signals within a data processing apparatus

2006-02-21

2006-02-21

Bonzo, Bryce P. (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

Reexamination Certificate

active

07003699

ABSTRACT:
The present invention provides a data processing apparatus and method for generating trace signals. The data processing apparatus comprises a component whose behaviour is to be traced, and a trace generation unit for receiving input signals from the component indicative of the behaviour, and for generating from the input signals high priority and low priority trace signals for outputting to a trace receiving device. The trace generation unit is responsive to assertion of a suppression signal from the trace receiving device to suppress generation of the low priority trace signals, with the aim of avoiding overflow of the trace receiving device. Furthermore, in the event that multiple trace modules are provided within a data processing apparatus, embodiments of the present invention provide funnel logic to enable the trace signals generated by those various trace modules to be combined into a single trace stream having a bandwidth which is less than the collective maximum bandwidth of the individual trace streams generated by the multiple trace modules.

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patent: 6148381 (2000-11-01), Jotwani
patent: 6615370 (2003-09-01), Edwards et al.
patent: 62224841 (1987-10-01), None
patent: 2001-147835 (2001-05-01), None
ARM Limited, “Trace Debug Tools” Version 1.2 User Guide, May 2002.

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