The sizetf callback function

A user-defined system function specifies the width of its return value with the sizetf callback function, and the simulator calls this function while loading the design. The following details on the sizetf callback function are not found in the IEEE Std 1364:

• If you omit the sizetf function, then a return width of 32 is assumed.
• The sizetf function should return 0 if the system function return value is of Verilog type "real".
• The sizetf function should return -32 if the system function return value is of Verilog type "integer".

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