Questa One Sim
Overview
Questa One Sim is the evolution of the functional simulator. It combines various verification flow aspects, boosting performance and productivity by leveraging faster engines. This enables faster engineers who use fewer workloads to finish verification tasks.
Introducing Questa One Sim: Reimagining Simulation Efficiency
Questa One Sim is Siemens’ next-gen, high-performance simulation platform, purpose-built for modern ASIC, and FPGA designs. It combines simulation, debug, coverage, and acceleration technologies into one unified flow – offering better speed, scalability, and engineering efficiency out of the box.
Why Questa One Sim?
Questa One Sim brings cornerstone Questa simulation technologies into a platform that is geared towards solving challenges faced by semiconductor companies designing the next generation of SoC’s, ASIC’s and FPGAs. The evolution of functional simulation brings together faster engines, providing a productivity boost that enables faster engineers and delivering cutting-edge technologies that help finish verification using fewer workloads.
Faster Engines
- Fastest simulation engine in the industry for DFT pattern simulations
- New optimizations for faster RTL and gate-level simulations
- ParallelSim with smart auto-partitioning capability for even faster performance
Faster Engineers
- Faster X debug capability with patented X-debugging feature
- New SmartCompile capability reduces simulation turnaround time for 3DIC, AI-accelerator designs
- Enhanced debug environment with many new advanced debugging capabilities
Fewer Workloads
- Root cause performance bottlenecks on regressions using all new multi-test profiler
- Generate complex UVM sequences faster with built-in PSS engine
- Expand VHDL verification to the next level with VHDL constraint solver support
Enhanced debugging capabilities to improve productivity
The integrated simulation and debugging engine gives you a new and improved interface for a more efficient verification flow. New dedicated debug windows for X-debug, constraints debug and protocol-aware debug enable a faster way to analyze complex verification environments. The ever-popular profiler can now profile across multiple tests to give you a regression-wide analysis of simulation hotspots.
Key Features and Benefits
- Unified Simulation Engine: Integrates functional fault and DFT verification in a single optimised environment
- Accelerated Performance: Provides faster simulation speeds for RTL, GLS, and DFT pattern verification, enhancing productivity
- Comprehensive Coverage: Offers robust fault modelling and extensive DFT support for thorough design validation
- Intuitive User Experience: Features streamlined workflows and intelligent automation to help engineers work more efficiently
Interested in Questa One Sim?
Contact us to Learn More
The Verification Academy
The Verification Academy is a collection of free online courses, focusing on various key aspects of advanced functional verification.
Tools for Simulation & Verification

QuestaSim
Simulation and Debug
Combines high performance and capacity simulation with unified advanced debug and functional coverage for the most complete native support of Verilog, SystemVerilog, VHDL, …

Questa Visualizer
Debug Environment
High performance, scalable, context-aware debug supporting the complete logic verification flow including simulation, emulation, prototyping, testbench, low-power, and assertion analysis.

ModelSim
HDL Simulation
ModelSim’s award winning Single Kernel Simulator (SKS) technology enables transparent mixing of VHDL and Verilog in one design.
Questa Verification IQ
Data Driven Verification
Questa VIQ is the collaborative, data-driven verification solution that transforms the verification process using AI/ML, analytics, collaboration, and traceability.

Questa Lint
Static RTL Verification
Questa Lint provides adaptive, integrated insight to the designer to ensure that the quality requirements and intent are met. Pre-configured methodologies provide immediate, intuitive feedback …

Questa Verification IP
Verification IP
Questa Verification IP (QVIP) improves quality and reduces schedule times by building protocol and methodology reusable components that support many industry standard interfaces.