VCS

Tool

VCS is identified in the evidence as a simulator used in RISC-V verification flows. It can execute constrained-random programs, replay failing cases deterministically, and participate in flows where ImperasDV provides lock-step reference-model comparison and Verdi provides debug and coverage analysis.

First seen 5/25/2026

Last seen 8/26/2026

Evidence 23 chunks

Wiki v1

WIKI

Overview

VCS is used as a simulation environment in RISC-V verification flows. The evidence describes constrained-random programs being executed in simulators such as VCS, with Verdi used for centralized debug.[C1]

Role in RISC-V verification

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NEIGHBORHOOD

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RELATIONSHIPS

22 connections

STING uses → 95% 2e

VCS executes STING-generated random tests as part of the verification flow.

Hybrid Verification Methodology ← uses 95% 2e

The hybrid methodology uses VCS for RTL simulation and deterministic replay of failing cases.

Performance of a SystemVerilog Sudoku Solver with VCS ← evaluates 100% 2e

The paper evaluates the VCS constraint solver's performance on Sudoku puzzles.

Constraint Solver implements → 100% 2e

VCS implements a constraint solver used for constrained random verification.

MathSAT5 ← compares with 100% 2e

VCS is compared against MathSAT5 for constraint solving performance.

Yices compares with → 100% 2e

VCS is compared against Yices for constraint solving performance.

Z3 compares with → 100% 2e

VCS is compared against Z3 for constraint solving performance.

Sudoku Solver SystemVerilog Test Bench ← uses 100% 2e

The test bench is simulated and solved using the VCS simulator.

Lockstep Co-Simulation ← uses 2e

VCS is used by lockstep co-simulation flows to execute the RTL design under test.

ImperasDV ← uses 95% 2e

ImperasDV integrates with VCS for RTL simulation in lockstep flows.

Synopsys published by → 95% 2e

VCS is published by Synopsys as an industry-standard RTL simulator.

XiangShan ← uses 95% 1e

XiangShan supports VCS as a simulation backend.

ImperasTS uses → 95% 1e

VCS executes ImperasTS directed suites as part of the verification flow.

RTL evaluates → 97% 1e

VCS is a high-performance RTL simulation platform that executes tests against RTL.

Verdi compares with → 88% 1e

Verdi and VCS are used together in the hybrid flow; results are merged in Verdi and failing cases are replayed in VCS.

RTL simulation implements → 100% 1e

VCS is an RTL simulation tool providing full signal visibility.

Constrained Random Verification ← uses 90% 1e

VCS is used for constrained random verification in hardware design flows.

WhisperFuzz ← uses 100% 1e

WhisperFuzz uses VCS to collect coverage reports and simulation traces.

SAT Solving implements → 90% 1e

VCS employs SAT solving as part of its constraint solving process.

Satisfiability Modulo Theories (SMT) implements → 90% 1e

VCS employs SMT techniques as part of its constraint solving process.

Conjunctive Normal Form (CNF) implements → 90% 1e

VCS reduces constraints to CNF as part of its solving process.

UVM ← uses 92% 1e

VCS is listed as one of the simulators used for running UVM testbenches.

LINKED ENTITIES

1 links

ImperasDV INTEGRATES_WITH Extracted graph relationship

CITATIONS

4 sources

4 citations — click to collapse

[1] VCS is used as a simulator for executing constrained-random programs in RISC-V verification flows, with Verdi providing centralized debug. source

[2] A described coverage-closure flow uses ImperasFC for functional coverage analysis, merges results in Verdi, and replays failing cases deterministically in VCS. source

[3] The evidence describes the ImperasDV reference model integrated with Verdi for unified coverage analysis in VCS. source

[4] ImperasDV enables lock-step comparison against a reference model and catches errors at instruction retirement. source