GHDL
The open-source VHDL simulator.
Overview
GHDL is a leading open-source simulator for the VHDL language. It functions as a compiler, analyzing and elaborating VHDL source files to generate a machine code model of the design. This compiled approach results in very fast simulation speeds. GHDL aims for full compliance with VHDL standards and is a popular choice in both hobbyist and professional environments for VHDL-based verification.
✨ Key Features
- VHDL standards compliance (VHDL-87, -93, -2002, -2008)
- High-performance compiled-code simulation
- Works with VUnit and Cocotb for testbench automation
- Can be used as a synthesis front-end for Yosys (via plugin)
- Waveform generation (VCD, GHW formats)
- Free and open source
🎯 Key Differentiators
- Completely free and open source with strong VHDL standards compliance
- High simulation performance due to its compiled nature
- Strong integration with other open-source tools and frameworks
Unique Value: Provides a no-cost, high-performance, and standards-compliant VHDL simulator, enabling robust verification for everyone from students to professionals.
🎯 Use Cases (5)
✅ Best For
- Verification of open-source VHDL IP cores
- Used as the simulation backend for VHDL verification frameworks like VUnit
💡 Check With Vendor
Verify these considerations match your specific requirements:
- Verilog or SystemVerilog designs (GHDL is VHDL-only)
- Users who require a full graphical IDE and debugger
🏆 Alternatives
Offers significantly better performance and VHDL-2008 support compared to other open-source VHDL simulators, and provides a free alternative to expensive commercial tools for VHDL-centric workflows.
💻 Platforms
✅ Offline Mode Available
🔌 Integrations
🛟 Support Options
- ✓ Live Chat
💰 Pricing
Free tier: GHDL is completely free and open source.
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