Use functional or register transfer level (RTL) simulation early to verify syntax and functionality. This step confirms that your RTL or behavioral code works as intended.
For larger hierarchical designs, simulate individual IP, block designs, or hierarchical modules before testing the entire design. This simulation process makes debugging easier in smaller portions. When each module performs as expected, create a top-level design test bench to verify complete design functionality. Reuse this test bench for final timing simulation to confirm operation under worst-case delay conditions.
Recommended: At this stage, timing
information is unavailable. Perform simulation in unit‑delay mode to avoid race
conditions. Use synthesizable HDL constructs during initial design creation. Avoid
instantiating specific components unless it preserves readable code, speeds simulation,
ensures portability, and promotes reuse for future designs.
Tip: Instantiate components only if the
tool cannot infer them. Instantiated components make your design code
architecture-specific.