FSimX Studio: README

RTL simulation, debug and coverage in one persistent window: the FSimX engine, vWIZ-Wave and vWIZ-Coverage, load-once and run interactively. This page is the feature list, the release notes, and how to run.

What it is

FSimX Studio is a desktop simulation studio that brings three WIOWIZ tools into a single session so you compile, load once, and then run, break, examine and restart from one window without re-elaborating between runs. It is WIOWIZ-native, including our own SystemVerilog front-end.

For licensing and support, email support@wiowiz.com.

Features

FSimX: the simulation engine

WIOWIZ-native front-end. Our own SystemVerilog parser and elaboration, built to hold up at gate-level (GLS) and UVM scale where a third-party front-end buckled.
Load once, run interactively. Compile and elaborate a project once, then run, break, examine, force and restart to t=0 without recompiling.
Headless too. The same engine runs from the command line for scripted and batch flows.

vWIZ-Wave: the waveform debugger

Subscribe-only tracing. Watches only the signals you add, so it stays responsive on SoC-scale designs with tens of thousands of signals.
Cross-probe. Click a signal to jump to its driver in the source; move between wave, source and hierarchy.
Transaction analyzer + memory viewer. Decode bus traffic off the waveform; reconstruct memories. FST is the archival format.

vWIZ-Coverage: closure

One closure picture. Code, functional and assertion coverage merge with formal unreachable (UNR) analysis, so you finish with evidence, not assumptions.
Same run, no re-run. The interactive run feeds coverage directly.

What’s new v0.8.107

0.8.107 current

Native Windows build. FSimX Studio now ships a native Windows x64 build (Windows 10 / 11) alongside the Linux Docker bundle, currently in final license-control checks, available on request.
Own SystemVerilog front-end. Replaced the third-party front-end with the WIOWIZ parser after heavy dumps at GLS and UVM scale.
Unified Studio window. Simulation, waveform debug and coverage closure in one persistent, cross-probed session, load once, run interactively, restart without re-elaboration.
Examples catalog. Self-checking examples from a counter and ALU up to a UVM memory and a multi-domain low-power SoC, each printing an explicit PASS.

earlier 0.8.x eval

Linux-only Docker eval builds of the unified Studio; vWIZ-Wave subscribe-only tracing and vWIZ-Coverage UNR closure brought into the single session.

Only the latest release is published for download. Older eval builds are retired, email support if you need a specific one.

Platforms & how to run

Linux · Docker bundle

v0.8.107 · 10 MB · x86-64 / WSL2 · .tar.gz

# unpack, verify + build the image, launch tar -xzf fsimx-studio-public-2026.07-docker.tar.gz cd fsimx-studio-public ./verify.sh ./run.sh # headless ./run.sh fsxrun counter.sv tb_counter.sv ./run.sh vwiz-wave work/counter.vcd ./run.sh vwiz-cov run --vcd work/counter.vcd

Windows · native build

v0.8.107 · x64 · Windows 10 / 11 · no installer

# unzip and launch Expand-Archive fsimx-studio-0.8.107-win-x64.zip cd fsimx-studio-win .\run.bat

In final license-control checks, request the Windows build.

Examples catalog

Every bundled example is self-checking and prints an explicit PASS in the transcript. Open one with File › Open Project and Run All:

Counter, ALU and FIFO, the basics, wave up in seconds.
Traffic-light FSM and UART, control and serial I/O.
Multi-master bus, arbitration and contention.
UVM memory, a constrained-random testbench.
Multi-domain low-power SoC, clock/power domains, the full flow end to end.

Download FSimX Studio →