I'll provide you with a complete Verilog-based traffic light controller implementation suitable for Cadence simulation, including the main module, testbench, and SDC constraints file.

Key Features of the Implementation:

Traffic Light Controller (traffic_light_controller.v):

• State Machine: 6 states including emergency and all-red transition
• Multiple Modes: Normal, Night, Rush Hour, and Manual modes
• Safety Features: All-red transition state prevents conflicts
• Emergency Override: Immediate response to emergency signals
• Configurable Timing: Easy to modify timing parameters

Testbench (traffic_light_tb.v):

• Comprehensive Testing: Tests all modes and edge cases
• Safety Monitoring: Detects illegal states (both directions green)
• Waveform Generation: Creates VCD file for Cadence viewing
• Performance Monitoring: Tracks state changes and timing
• Detailed Logging: Formatted output for easy debugging

SDC File (traffic_light.sdc):

• Clock Constraints: 100MHz system clock with uncertainty
• I/O Timing: Input/output delays for external interface
• Design Rules: Maximum transition, fanout, and capacitance
• Power Considerations: Switching activity for power analysis
• Path Grouping: Organized for timing report analysis

Usage in Cadence:

1. Simulation: Use ncverilog or xcelium to run the testbench
2. Synthesis: Use genus with the SDC file for timing-driven synthesis
3. Waveform Viewing: Use simvision to view the generated VCD file
4. Static Timing Analysis: Use tempus with the SDC constraints

The design is scalable and can be easily modified for different timing requirements or additional features like pedestrian crossing signals.