Can we return data from SystemVerilog task?

SystemVerilog
, ,
5

In reply to mehul.gor:

In Verilog/SystemVerilog, a potentially time consuming routine must be written as a task.

task READ_DPI(input int address, output int data);
  #100 data = MEM[address];
endtask
export "DPI-C" task READ_DPI;

If you compile this code generating a DPI header file, it will produce this prototype:

DPI_LINK_DECL int
READ_DPI(
    int address,
    int* data);

An output argument is passed by reference in C. Note that the int return value of a DPI exported task is used for disables, and can be ignored if not used.
Your code can call this routine as:

#include "dpi.h"
...
READ_DPI(address,&data);
...

If you really need the READ routine to be a function in C, you can put a wrapper around it:

int READ(
  int address) {
  int data;
  READ_DPI(address &data);
  return data;
}