• Adds the following options for generating traces using the Verilator backend:
  • maxArraySize: Maximum array depth for tracing
  • maxWidth: Maximum bit width for tracing
  • traceDepth: Depth of tracing

The corresponding Verilator flags are only added if the above integer values are > 0.

• Adds TraceStyle.Fst for generating FST traces.

• Removes the unused filename field from TraceStyle, which seemed very confusing. The trace file name (stem) is only configured through CommonSimulationSettings.traceFileStem.

I guess, technically an API change due to the change of the TraceStyle.Vcd case class?

Replaces #4910

Contributor Checklist

• Did you add Scaladoc to every public function/method?
• Did you add at least one test demonstrating the PR?
• Did you delete any extraneous printlns/debugging code?
• Did you specify the type of improvement?
• Did you add appropriate documentation in docs/src?
• Did you request a desired merge strategy?
• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• Feature (or new API)
• API modification

Desired Merge Strategy

• Rebase: You will rebase the PR onto master and it will be merged with a merge commit.

Release Notes

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels? (Select the most appropriate one based on the "Type of Improvement")
• Did you mark the proper milestone (Bug fix: 3.6.x, 5.x, or 6.x depending on impact, API modification or big change: 7.0)?
• Did you review?
• Did you check whether all relevant Contributor checkboxes have been checked?
• Did you do one of the following when ready to merge:
  • Squash: You/ the contributor Enable auto-merge (squash) and clean up the commit message.
  • Merge: Ensure that contributor has cleaned up their commit history, then merge with Create a merge commit.