From Register Specification to Silicon-Ready RTL, Verification & Software
One Register Specification. Every Output You Need.
RegGen Suite is an enterprise-grade register management and compilation platform for ASIC designers, verification engineers, firmware developers, and FPGA teams. Please do Login before downloading it.
Define your register map once and automatically generate:
- Synthesizable SystemVerilog RTL
- UVM Register Abstraction Layer (RAL)
- C/C++ register headers
- Register documentation
- IP-XACT 2014
- SystemRDL 2.0
But RegGen goes beyond traditional code generation.
It provides Design Rule Checking, semantic specification comparison, downstream impact analysis, SoC-level memory-map merging, multiple input formats, and offline-first execution—helping teams maintain a consistent register definition throughout the design lifecycle.
Define once → Validate → Lint → Generate → Compare → Integrate
Used by VLSI engineers for faster design, verification, and firmware development.
One Source of Truth
Define your register architecture once using a supported specification format.
RegGen can compile that specification into all supported downstream representations.
Input
YAML | JSON | Excel | SystemRDL | IP-XACT
↓
RegGen Compiler
Validation + DRC/Lint + Generation + Diff/Impact + SoC Merge
↓
Output
RTL | UVM RAL | C Headers | Documentation | IP-XACT | SystemRDL
This eliminates the need to manually maintain multiple versions of the same register information.
6 Output Formats in One Run
RegGen can generate six different outputs from a single register specification.
1. SystemVerilog RTL
Generate synthesizable CSR/register-block RTL containing:
- Address decoding
- Read multiplexing
- Write-enable logic
- Register fields
- Reset behavior
Supports:
APB3 | AXI4-Lite | Custom register interfaces
2. UVM RAL Model
Generate a complete UVM Register Abstraction Layer containing:
- uvm_reg_block
- uvm_reg
- uvm_reg_field
- Register offsets
- Field access policies
- Reset values
This keeps the verification model synchronized with the RTL register definition.
3. C Headers
Generate firmware-friendly register definitions containing:
- Base-address mappings
- Register offsets
- Bit masks
- Field shift values
- Register/field information
Firmware developers no longer need to manually translate register specifications into C macros.
4. Register Documentation
Generate Markdown register documentation containing:
- Address maps
- Register descriptions
- Field descriptions
- Bit ranges
- Access policies
- Reset information
5. IP-XACT 2014
Generate IEEE 1685-2014 compatible XML for interoperability with EDA environments such as Vivado and Platform Designer.
6. SystemRDL 2.0
Generate an Accellera SystemRDL representation of the register architecture for EDA and register-management flows.
All six outputs can be generated from a single specification in one compilation flow.
Powerful Input Flexibility
You don’t have to start with one specific format.
RegGen supports five input formats:
| Input | Extension | Best For |
|---|---|---|
| YAML | .yaml, .yml | Human-readable register specifications |
| JSON | .json | Structured/automated workflows |
| Excel | .xlsx | Spreadsheet-based register definitions |
| SystemRDL | .rdl | Standard register-description flows |
| IP-XACT | .xml | EDA interoperability |
The CLI can automatically detect the input format from the file extension.
This means different teams can continue using the format that fits their existing workflow while still participating in the same register-generation pipeline.
Built-In Design Rule Checking
Catch Register Problems Before They Become Silicon Problems
RegGen includes ASIC-focused Design Rule Checking (DRC/Lint) specifically designed to identify common register-definition mistakes.
Current rules include checks for:
- Non-word-aligned register offsets
- Overlapping fields
- Undefined/reserved bit gaps
- Invalid register/field naming
- Write-only field concerns
- Non-zero reset values on read-only fields
- Large address gaps
- Missing field descriptions
- Missing register descriptions
- Generic single-bit field names
- Reset values exceeding field width
- Excessively sparse register address spaces
The suite currently provides 12 lint rules, with community and Pro rule tiers.
Why this matters
A small register-definition mistake can propagate into:
RTL → UVM → Firmware → Documentation
RegGen allows these issues to be detected at the specification level—before they spread across the rest of the project.
Semantic Diff & Impact Analysis
Know Exactly What a Register Change Breaks
Register specifications evolve throughout a project.
Changing:
- A register address
- A field width
- A field access type
- A reset value
- A field definition
can have consequences across multiple teams.
RegGen performs a semantic comparison between two register specifications and identifies the actual register-level changes.
The tool can also identify affected downstream areas such as:
RTL → UVM RAL → C Headers → Documentation → IP-XACT → SystemRDL → Tests
This makes register changes easier to review before they enter RTL or firmware development.
SoC Memory Map Merging
From Individual IPs to a Unified SoC Memory Map
Modern SoCs can contain hundreds of IP blocks, often with nested bus hierarchies and multiple register specifications.
RegGen can merge multiple IP register specifications into a single top-level SoC memory map.
Example
You can combine:
- UART register specification
- SPI register specification
- I²C register specification
- Timer register specification
- Other peripheral IPs
into one SoC-level map.
Offline-First by Design
Your IP Stays on Your Machine
RegGen is designed for 100% offline execution.
The README specifies:
0 network calls
There are no cloud compilation steps, telemetry, or requirements to upload proprietary register specifications to an external service.
This is particularly important for semiconductor companies working with:
- Confidential IP
- Customer designs
- Pre-silicon architectures
- Proprietary SoC specifications
- NDA-protected projects
Your register specifications remain local to your development environment.
Web Application
No Installation Required
RegGen is also available as a web application.
Upload or paste your register specification and work with the generated outputs directly from the browser.
The web application supports:
- JSON
- YAML
- Excel
- IP-XACT
- SystemRDL
- File upload
- Direct input/paste
- Live preview of generated outputs
- AI-powered specification generation from natural language
- ZIP download of generated outputs
Try RegGen Web:
AI-Powered Register Specification
Describe Your Register Block in Natural Language
The web application includes AI-powered specification generation.
Instead of starting from an empty register file, you can describe the desired register block and use AI-assisted generation to create the initial specification.
This can help accelerate the starting point for register-map development while keeping the generated specification as the central artifact.
Why Teams Use RegGen
⚡ Reduce Manual Work
Stop manually creating the same register information in RTL, UVM, C headers and documentation.
🎯 Improve Consistency
Every generated artifact originates from the same register specification.
🐛 Catch Errors Earlier
DRC identifies register-definition problems before they propagate into implementation.
🔍 Understand Change Impact
Semantic diff identifies breaking register changes and their downstream consequences.
🏗️ Simplify SoC Integration
Merge multiple IP register maps into one unified memory map.
🔒 Protect Proprietary IP
Offline-first execution keeps register specifications local.
🔄 Support Existing Workflows
Work with YAML, JSON, Excel, SystemRDL and IP-XACT inputs.
🚀 Accelerate Development
Generate multiple downstream artifacts from a single command.
📚 Keep Documentation Synchronized
Generate register documentation directly from the specification.
Built for the Entire Hardware Development Team
| Team | Primary Value |
| ASIC Design | Generate synthesizable CSR RTL |
| Design Verification | Generate UVM RAL models |
| Firmware | Generate C register headers |
| SoC Architecture | Merge complete memory maps |
| FPGA | Generate register interfaces |
| IP Development | Create reusable register artifacts |
| Validation | Detect specification errors |
| Project/Integration Teams | Analyze register changes |
| Documentation | Generate synchronized register manuals |
Key Capabilities at a Glance
6 Output Formats
RTL • UVM RAL • C Headers • Markdown • IP-XACT • SystemRDL
5 Input Formats
YAML • JSON • Excel • SystemRDL • IP-XACT
12 DRC/Lint Rules
ASIC-focused register design checks
3 Bus Options
APB • AXI4-Lite • Custom
SoC Memory Map
Multi-IP • Multi-instance • Nested hierarchy • Cross-format
Semantic Diff
Breaking/non-breaking changes + downstream impact
Offline First
0 network calls
Web Application with AI Assistance
Browser-based workflow with live output preview
RegGen — The unified register-map compiler for ASIC designers, verification engineers, and firmware developers.
Contact:
contact@vlsiworlds.com