ISE
Simulation Overview
During HDL simulation, the simulator software verifies the functionality and timing of your design or portion of your design. The simulator interprets VHDL or Verilog code into circuit functionality and displays logical results of the described HDL to determine correct circuit operation. Simulation allows you to create and verify complex functions in a relatively small amount of time.
Simulation takes place at several points in the design flow. It is one of the first steps after design entry and one of the last steps after implementation, as part of verifying the end functionality and performance of the design. Simulation is an iterative process, which may require repeating until both design functionality and timing is met. For a typical design, simulation comprises the following high-level steps:
  1. Compilation of the simulation libraries Image
    Note Library compilation is not necessary when using the ISim simulator.
  2. Creation of the design and test bench Image
  3. Functional simulation Image
  4. Implementation of the design and creation of the timing simulation netlist Image
  5. Timing simulation Image
Additional Resources
Additional information is available in the following Xilinx® documentation.
DocumentationTopics Covered
Synthesis and Simulation Design Guide (UG626)Xilinx simulation capabilities
ISim Help
Note In the Help Viewer, click the Synchronize Contents to Current Topic button Image to view all related Help topics.
Xilinx ISim simulator
Libraries GuidesXilinx Unified Library Symbols

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