Module 61 min
Optimization Techniques
Logic sharing, constant folding, dead code elimination, cell downsizing. Minimize cell count and wire length. Use compile -map_effort high and set_max_area 0.
Area Optimization
Logic sharing, constant folding, dead code elimination, cell downsizing. Minimize cell count and wire length. Use compile -map_effort high and set_max_area 0.
Timing Optimization
Critical path restructuring, cell upsizing, buffer insertion, logic duplication for fanout reduction. Fix negative slack paths. Use compile_ultra -timing_high_effort_script.
Power Optimization
Clock gating insertion, operand isolation, multi-threshold voltage assignment (HVT/SVT/LVT), data activity propagation via switching activity files (SAIF).
Advanced Optimization Techniques
| Technique | Description | Benefit |
|---|---|---|
| Retiming | Move registers across combinational logic to balance pipeline stages | Timing |
| Constant Propagation | Replace signals that are always 0/1 with constants; simplify downstream logic | Area |
| Logic Restructuring | Rearrange tree structures (AND/OR) to reduce critical path depth | Timing |
| Ungroup Hierarchy | Flatten sub-modules to enable cross-boundary optimization | Timing |
| Path Grouping | Group critical paths for prioritized optimization effort | Timing |
| Multi-Vt Assignment | Use HVT cells in non-critical paths, LVT on critical paths | Power+Timing |