Mechanism to synchronize probes during simulation of system-level designs

• US 20040093197A1
• Filed: 11/13/2002
• Published: 05/13/2004
• Est. Priority Date: 11/13/2002
• Status: Active Grant

• Current Assignee: Cadence Design Systems Incorporated (Cadence Group)
• Original Assignee: Cadence Design Systems Incorporated (Cadence Group)
• Inventors: Brunel, Jean-Yves, Billemaz, Marc, Bornat, Pascal
• Granted Patent: US 7,072,813 B2
• Time in Patent Office: Days
• US Class Current: 703/13
• CPC Class Codes: G06F 2119/12 Timing analysis or timing optimisation
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30
• CPC Class Codes: H04Q 2209/845 where the measuring is synchronized between sensing devices
• CPC Class Codes: H04Q 9/04 Arrangements for synchronous operation

Abstract

In system design simulators, probes are software objects that collect data from simulated system components. A probe synchronization method and device are used to collect simulation data from the components during a period of interest. For example, a given event that occurs during the simulation may signal the beginning of the period, and another event may signal the end of the period. An acquisition window having a starting point and an ending point coinciding with the occurrence of the events may be used by a probe master to cause one or more probes to collect data during this period of interest. A unique Identifier or Tag of this period of interest is generated by the Probe Master and sent to all the slave probes. This Tag is dumped in the simulation database. It allows post-processing correlations between high-level simulation events and low-level model reactions.

Claims

1. A method of synchronizing probes of one or more system design resources during a simulation of a system design comprising:

sending a signal to indicate an occurrence of a start event from one of the system design resources to a first probe master; and

sending a start action signal from the first probe master to a plurality of slave probes to cause the slave probes to simultaneously start collecting data samples from one or more system design resources.

2. The method of claim 1 further comprising:

sending a signal indicating an occurrence of a stop event from one of the system design resources to the first probe master; and

sending a stop action signal from the first probe master to the slave probes to cause the slave probes to simultaneously stop collecting data samples and to store the data samples in a database.

3. The method of claim 2 further comprising:

tagging the data samples collected during a first collection period from the occurrence of the start event to the occurrence of the stop event with a unique identifier for the first collection period.

4. The method of claim 3 further comprising:

completing the simulation of the system design; and

identifying the data samples collected during the first collection period based on the unique identifier.

5. The method of claim 4 further comprising:

correlating the identified data samples with the start and stop events of the first collection period.

6. The method of claim 1 further comprising:

associating at least one slave probes with one system design resource; and

causing the at least one slave probes to simultaneously start collecting data samples from the one system design resource.

7. The method of claim 1 further comprising:

sending a signal indicating an occurrence of a stop event from one of the system design resources to a second probe master; and

sending a stop action signal from the second probe master to the slave probes to cause the slave probes to simultaneously stop collecting data samples and to store the data samples in a database.

8. The method of claim 1 further comprising:

sending a signal to indicate an occurrence of a flush event from one of the system design resources to the first probe master; and

sending a flush action signal from the probe master to the slave probes to cause the slave probes to simultaneously store the data samples in a database.

9. The method of claim 1 further comprising:

sending a signal to indicate an occurrence of an abort event from one of the system design resources to the first probe master; and

sending an abort action signal from the probe master to the slave probes to cause the slave probes to simultaneously delete the data samples.

10. The method of claim 1 wherein sending the start action signal further comprises:

causing a first slave probe to start collecting data samples from a functional model of a resource;

causing a second slave probe to start collecting data samples from a communications model of the resource; and

causing a third slave probe to start collecting data samples from an architectural model of the resource.

11. An article of manufacture comprising a computer readable medium storing instructions which, when executed by a processing system, cause the system to perform a method of synchronizing probes of one or more system design resources during a simulation of a system design comprising:

sending a signal to indicate an occurrence of a start event from one of the system design resources to a first probe master; and

sending a start action signal from the first probe master to a plurality of slave probes to cause the slave probes to simultaneously start collecting data samples from one or more system design resources.

12. The medium of claim 11 further comprising instructions which, when executed, cause the system to perform:

sending a signal indicating an occurrence of a stop event from one of the system design resources to the first probe master; and

sending a stop action signal from the first probe master to the slave probes to cause the slave probes to simultaneously stop collecting data samples and to store the data samples in a database.

13. The medium of claim 12 further comprising instructions which, when executed, cause the system to perform:

tagging the data samples collected during a first collection period from the occurrence of the start event to the occurrence of the stop event with a unique identifier for the first collection period.

14. The medium of claim 13 further comprising instructions which, when executed, cause the system to perform:

completing the simulation of the system design; and

identifying the data samples collected during the first collection period based on the unique identifier.

15. The medium of claim 14 further comprising instructions which, when executed, cause the system to perform:

correlating the identified data samples with the start and stop events of the first collection period.

16. The medium of claim 11 further comprising instructions which, when executed, cause the system to perform:

associating at least one slave probes with one system design resource; and

causing the at least one slave probes to simultaneously start collecting data samples from the one system design resource.

17. The medium of claim 11 further comprising instructions which, when executed, cause the system to perform:

sending a signal indicating an occurrence of a stop event from one of the system design resources to a second probe master; and

sending a stop action signal from the second probe master to the slave probes to cause the slave probes to simultaneously stop collecting data samples and to store the data samples in a database.

18. The medium of claim 11 further comprising instructions which, when executed, cause the system to perform:

sending a signal to indicate an occurrence of a flush event from one of the system design resources to the first probe master; and

sending a flush action signal from the probe master to the slave probes to cause the slave probes to simultaneously store the data samples in a database.

19. The medium of claim 11 further comprising instructions which, when executed, cause the system to perform:

sending a signal to indicate an occurrence of an abort event from one of the system design resources to the first probe master; and

sending an abort action signal from the probe master to the slave probes to cause the slave probes to simultaneously delete the data samples.

20. The medium of claim 11 further comprising instructions which, when executed, cause the system to perform sending the start action signal by:

causing a first slave probe to start collecting data samples from a functional model of a resource;

causing a second slave probe to start collecting data samples from a communications model of the resource; and

causing a third slave probe to start collecting data samples from an architectural model of the resource.

21. An apparatus for synchronizing probes of one or more system design resources during a simulation of a system design comprising:

means for sending a signal to indicate an occurrence of a start event from one of the system design resources to a first probe master; and

means for sending a start action signal from the first probe master to a plurality of slave probes to cause the slave probes to simultaneously start collecting data samples from one or more system design resources.

22. The apparatus of claim 21 further comprising:

means for sending a signal indicating an occurrence of a stop event from one of the system design resources to the first probe master; and

means for sending a stop action signal from the first probe master to the slave probes to cause the slave probes to simultaneously stop collecting data samples and to store the data samples in a database.

23. The apparatus of claim 22 further comprising:

means for tagging the data samples collected during a first collection period from the occurrence of the start event to the occurrence of the stop event with a unique identifier for the first collection period.

24. The apparatus of claim 23 further comprising:

means for completing the simulation of the system design; and

means for identifying the data samples collected during the first collection period based on the unique identifier.

25. The apparatus of claim 24 further comprising:

means for correlating the identified data samples with the start and stop events of the first collection period.

26. The apparatus of claim 21 further comprising:

means for associating at least one slave probes with one system design resource; and

means for causing the at least one slave probes to simultaneously start collecting data samples from the one system design resource.

27. The apparatus of claim 21 further comprising:

means for sending a signal indicating an occurrence of a stop event from one of the system design resources to a second probe master; and

means for sending a stop action signal from the second probe master to the slave probes to cause the slave probes to simultaneously stop collecting data samples and to store the data samples in a database.

28. The apparatus of claim 21 further comprising:

means for sending a signal to indicate an occurrence of a flush event from one of the system design resources to the first probe master; and

means for sending a flush action signal from the probe master to the slave probes to cause the slave probes to simultaneously store the data samples in a database.

29. The apparatus of claim 21 further comprising:

means for sending a signal to indicate an occurrence of an abort event from one of the system design resources to the first probe master; and

means for sending an abort action signal from the probe master to the slave probes to cause the slave probes to simultaneously delete the data samples.

30. The apparatus of claim 21 wherein said means for sending the start action signal further comprises:

means for causing a first slave probe to start collecting data samples from a functional model of a resource;

means for causing a second slave probe to start collecting data samples from a communications model of the resource; and

means for causing a third slave probe to start collecting data samples from an architectural model of the resource.