Siemens EDA: Debug Constraints Live in Questa One Sim

What’s covered

“Stop guessing why randomization fails and debug constraints live in Questa” is a free Siemens EDA webinar on Thursday, October 29, 2026 at 9:30 PM IST, presented by Raghava Bathula and Mahendra Inturi. Registration is free.

Siemens notes that when randomize() fails, or quietly produces the wrong values, tracking down the constraint responsible can take hours. The session shows how the Constraint Debug Window in Questa One Sim lets you inspect variables, visualize distributions and isolate conflicting constraints in real time, from a single breakpoint and with no recompilation.

What you will learn:

• Enabling the Constraint Debug Window and setting randomize() breakpoints from the GUI or the transcript
• Spotting conflicting constraints through red highlighting and the Unsatisfiable column
• Toggling constraint_mode and rand_mode to isolate and disable problem constraints on the fly
• Running Distribution Analysis to see the solution space as a histogram
• Using Value Injection and Binary Constraints to test whether a specific value is reachable

Who should attend

Verification engineers and UVM users working with SystemVerilog constrained-random testbenches who want to debug randomize() failures faster.

Tools covered

Questa One Sim

Speakers

Session time

Registration is free. Time sourced from the official ON24 registration page.

This session runs in the same slot as Siemens’ What’s New in Xpedition 2610 webinar.

Why GSAS is sharing this

GSAS is an authorized engineering partner for Siemens EDA in India. On the verification side we supply Questa FPGA Essentials, the FPGA simulation bundle built on the Questa simulator with SystemVerilog and UVM support. This session comes straight from Siemens EDA applications engineers who specialise in Questa debug.

If your verification needs go beyond FPGA simulation, talk to us and we will confirm current Questa One availability for your configuration.

Register free on ON24 →