Skill

sim-tool-profiles

Provides passive profiles for replayable RTL simulation execution using Verilator, Iverilog, VCS, Xrun, and Questa. Includes UVM coverage collection, merge tools, and regression scripts.

testing

Install

npx claudepluginhub babyworm/rtl-agent-team --plugin rtl-agent-team

Tool Access

This skill uses the workspace's default tool permissions.

Preview

- Prefer wrapper: `scripts/run_sim.sh`

SKILL.md

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Stars12

Forks3

Last CommitMar 31, 2026

Actions

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Simulation Tool Profiles

Common Contract

Prefer wrapper: scripts/run_sim.sh
Every run must emit:
- primary log path
- replay script path
- pass/fail summary

Open-Source Baseline

verilator:
- scripts/run_sim.sh --sim verilator --top <tb_top> -f rtl/filelist_top.f --outdir sim/reports --trace
iverilog:
- scripts/run_sim.sh --sim iverilog --top <tb_top> -f rtl/filelist_top.f --outdir sim/reports

Commercial Profiles

vcs:
- scripts/run_sim.sh --sim vcs --top <tb_top> -f rtl/filelist_top.f --outdir sim/reports
xrun:
- scripts/run_sim.sh --sim xrun --top <tb_top> -f rtl/filelist_top.f --outdir sim/reports
questa:
- scripts/run_sim.sh --sim questa --top <tb_top> -f rtl/filelist_top.f --outdir sim/reports

UVM Coverage Collection (Commercial Only)

Code coverage must be enabled at both compile and runtime for all commercial simulators.

Simulator	Compile Flag	Runtime Flag	Coverage DB	Merge Tool
VCS	`-cm line+cond+fsm+tgl+branch`	`-cm line+cond+fsm+tgl+branch -cm_dir <dir>.vdb`	`.vdb` directory	`urg -dir *.vdb -format both`
Xcelium	`-coverage all`	`-coverage all -covworkdir <dir>/cov_work -covscope tb_top`	`cov_work/` directory	`imc -exec merge.tcl`
Questa	`+cover=bcestf` (at `vlog`)	`-coverage` (at `vsim`) + `-do "coverage save -onexit <file>.ucdb"`	`.ucdb` file	`vcover merge out.ucdb *.ucdb`

Questa gotcha: +cover=bcestf at vlog compile is mandatory — runtime -coverage alone collects nothing.

UVM regression runner: skills/rtl-p5s-uvm-verify/scripts/run_regression_uvm.sh

Handles compile-once + parallel multi-seed execution + coverage merge per simulator
Targets: line ≥ 90%, toggle ≥ 80%, FSM ≥ 70%, branch ≥ 80%, functional ≥ 95%

Normalized Result Fields

tool
status (pass or fail)
errors_count
warnings_count
log_path
replay_path