Apparatus and method for compression of the timing trace stream
US7463653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2003 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Jan 5, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L43/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.