SystemVerilog

SystemVerilog (IEEE 1800) extends Verilog with design and verification features, but for RTL, the most impactful are stricter typing and intent-expressing constructs. The logic type replaces reg/wire ambiguity for most signals—it can be driven by either assignments or procedural blocks (but not multiple drivers), eliminating a common class of declaration errors. logic is the modern, preferred type for RTL design.

The always_comb, always_ff, and always_latch blocks replace generic always with synthesis-intent-specific variants. always_comb automatically infers sensitivity lists and flags incomplete assignments as warnings; always_ff reserves edge-triggered logic and helps readers and tools immediately recognize registers. always_latch explicitly marks latch inference. This makes RTL self-documenting and catches accidental latches and sensitivity list errors at compile/lint time rather than simulation debug.

enum types improve FSM state encoding readability over raw constants. Packed/unpacked arrays and structs organize related signals (e.g., bundling valid, opcode, data). interface constructs group related signals between modules. package shares type definitions and parameters across hierarchies. unique/priority case qualifiers assert completeness and exclusivity. These features elevate RTL clarity and maintainability.

SystemVerilog includes verification features (classes, randomization, coverage), but RTL designers use a synthesizable design-side subset while verification engineers use OOP/testbench features. As roles converge, understanding both design and verification constructs is increasingly expected. A synthesis-focused coding style bridges both worlds without requiring testbench complexity.

Key Concepts

  • logic, always_comb, always_ff declarations
  • enum for FSM state machines
  • Packed/unpacked structures and arrays
  • interface for bundled signal groups
  • unique/priority case assertions

Resume Tips

  • Show fluency in modern synthesizable SystemVerilog (not legacy Verilog)
  • Highlight use of enum and structures for readable, maintainable RTL
  • Discuss interface design for complex protocols (bundling, self-documentation)
  • Mention cross-team collaboration between design and verification using SV

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