Summary

This blog explains three practical differences MCU developers must understand when moving to FPGAs: the shift from software-style code reuse to HDL templating, how to handle metastability and clock-domain crossings, and the correct use of blocking vs. non-blocking assignments in Verilog/SystemVerilog. It gives concrete guidance and examples to avoid common pitfalls that cause functional bugs and timing issues in hardware designs.

Key Takeaways

• Adopt HDL templating and parameterized modules instead of expecting runtime code reuse; use generate blocks, parameters, and interfaces to build reusable hardware components.
• Mitigate metastability by applying proper synchronizers, handshake or FIFO-based CDC techniques, and by budgeting timing margins; verify CDC in both simulation and static timing analysis.
• Use non-blocking assignments for sequential (clocked) logic and blocking assignments for combinational logic in Verilog/SystemVerilog to avoid simulation-versus-synthesis mismatches.
• Design explicit hardware state machines and handshakes for operations that are instantaneous in software; avoid assuming MCU-style sequential flow or dynamic memory behaviors in HDL.

Who Should Read This

Embedded/firmware engineers experienced with MCUs who are beginning FPGA development and want practical, implementation-focused guidance to avoid common HDL and CDC mistakes.

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