System and a method for checking lock step consistency between an in circuit emulation and a microcontroller while debugging process is in progress
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United States of America Patent
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Jul 26, 2005
Grant Date -
N/A
app pub date -
Nov 15, 2001
filing date -
Nov 15, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Checking the consistency of a lock step process while debugging a microcontroller code is in progress. A method provides a production microcontroller to execute an instruction code and provides the result of the instruction code to an ICE. The ICE, independent from the production microcontroller and simultaneously, executes the same instruction code and produces a result. The ICE compares the result of its computation and the result received from the production microcontroller. The ICE issues a 'lock step error' when the result of the comparison is a mismatch. A trace buffer residing in the host device provides the location of the line of code causing the mismatch. After identifying the line of code causing the mismatch the user debugs the erroneous line of code. The debugging process resumes on the next line of code in the microcontroller code under test.
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