Properties of Imported Function and Task
- An imported function shall complete their execution instantly and consume zero simulation time. Imported task can consume time.
- Imported function can have input, output, and inout arguments.
- The formal input arguments shall not be modified. If such arguments are changed within a function, the changes shall not be visible outside the function.
- Imported function shall not assume any initial values of formal output arguments. The initial value of output arguments is undetermined and implementation dependent.
- Imported function can access the initial value of a formal inout argument. Changes that the Imported function makes to a formal inout argument shall be visible outside the function.
- An Imported function shall not free the memory allocated by SystemVerilog code nor expect SystemVerilog code to free memory allocated by Foreign code or (Foreign Compiler).
- A call to an Imported task can result in suspension of the currently executing thread. This occurs when an Imported task calls an Exported task, and the Exported task executes a delay control, event control or wait statement. Thus it is possible for an Imported task to be simultaneously active in multiple execution threads.
- A Imported function or task can be equip with special properties called pure or context.
Read more about this topic: System Verilog DPI
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