AR #33422 - ISE Simulator (ISim) - Error "tracing limit is reached. Signal tracing will stop!"
ISE Simulator (ISim) - Error "tracing limit is reached. Signal tracing will stop!"
| AR# | 33422 |
| Part | SW-ISE Simulator |
| Last Modified | 2009-10-30 00:00:00.0 |
| Status | Active |
| Keywords | Tracing Limit |
Description
Keywords: Tracing Limit
I am able to launch a simulation of my design using ISim. However, after it has run for some time, I encounter the following error:
"tracing limit is reached. Signal tracing will stop!"
What is a "tracing limit" and how can I resolve this issue?
Solution 1
A "tracing limit" is a limit on the total number of transitions that can be stored in the waveform database (wdb) file for viewing in the waveform viewer based on the available system memory. This error can occur when the simulator is unable to allocate enough memory to store a large number of transitions occurring in a simulation.To resolve this issue, you can do one of two things:
- Install the latest ISE Design Suite 11 Update. Running the latest version of the simulator offers enhanced memory usage, allowing for simulations to run longer with a larger number of waveform transitions.
- Add to the Wave window only the signals that are relevant to the verification process. For example, not all top level signals are of interest in a given simulation session. Removing traced signals from the Wave window results in less memory consumption, allowing the simulator to simulate to completion without issuing the error.
Solution 2
This error can occur prematurely if the simulation is run on machine with a large amount of available memory (typically less than 20% of memory usage at the time of launch). This is a known issue in all ISE Design Suite 11 versions up to ISE Design Suite 11 Update 3. This issue is resolved in ISE Design Suite 11 Update 4 (11.4), due out December 2009.To resolve this issue for ISE Design Suite 11 Update 3 (11.3):
1. Check that ISE 11 Update 3 (11.3) is installed; this can be done by selecting Help -> About from Project Navigator or ISim.
2. Install the patch contained in the following ZIP file:
ftp://ftp.xilinx.com/pub/swhelp/ise11_updates/ar33592.zip
To install the patch, follow the instructions contained in the "readme.txt" file.
If this solution does not resolve the error, open a WebCase with Xilinx Technical Support at: http://www.xilinx.com/support/clearexpress/websupport.htm