Final answer:
An error message 'top level design entity is undefined' typically occurs in the context of hardware description languages (HDL) such as VHDL or Verilog. This error indicates that the top-level module or entity in the design hierarchy is not properly defined or declared.
Step-by-step explanation:
An error message 'top level design entity is undefined' typically occurs in the context of hardware description languages (HDL) such as VHDL or Verilog. This error indicates that the top-level module or entity in the design hierarchy is not properly defined or declared.
For example, in VHDL, the design entity should be defined using the 'entity' keyword followed by the entity name and port declarations. If the entity is not properly defined or is missing, the error message 'top level design entity is undefined' will be displayed.
To resolve this error, check the design hierarchy and make sure the top-level entity is correctly defined with the appropriate syntax.