Apparatus and method for compression of the timing trace stream

Details Apparatus and method for compression of the timing trace stream Apparatus and method for compression of the timing trace stream

2003-12-05

2008-12-09

Yao, Kwang Bin (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C714S045000

Reexamination Certificate

active

07463653

ABSTRACT:
In a test and debug system, a plurality of trace streams, including a timing trace stream, are transmitted from the target processing unit to the host processing unit for analysis. The timing trace stream, the trace stream that indicates activity or non-activity of the program counter each clock cycle, can occupy a large percentage of the bandwidth of the transmitted data. The transmitted data is organized into groups of packets, each packet having a control signal portion and a payload portion. Each information packet has a logic signal stored at each location indicating an activity or a non-activity of the program counter. By identifying portion of the timing trace stream wherein the activity or non-activity does not change for one or more groups of timing packets, the information in a plurality of packets can be represented by a header and an information packet that describes a number of packets in which the activity or non-activity of the program counter does not change.

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