Using Interface class

SystemVerilog
, ,
1

I want to access base class methods defined in ‘interface class’. I have a compilation error. I don’t know how to fix this error. I look forward your help.

interface class put_Q_class; // base class1
rand int Rdata;
int Qdata[$];	
	// pure virtual methods
	pure virtual function put(int Rdata);			
	endfunction
endclass

interface class get_Q_class; // base class2
rand int Rdata;	
int Qdata[$];	
	pure virtual function get(int Rdata);			
	endfunction
endclass

class fifo_class implements put_Q_class, get_Q_class;
	
	virtual function put(int Rdata);
		
		Qdata.push_back(Rdata);	

	endfunction

	virtual function get(int Rdata);
		
		Qdata.pop_front(Rdata);	

	endfunction
endclass

In my top file, I call the put method (just for the moment) to send random values into queue.

module top;
fifo_class fifo_h;
	initial begin
                fifo_h = new;
		for (int i2=0; i2<10; i2++) begin // push into queue using interface class structure
			fifo_h.randomize();
			fifo_h.put(fifo_h.Rdata);
		end
		$display("elements in queue using interface class =%0p",fifo_h.Qdata);
	end
endmodule

I have this compilation error:

** Error: intf_class.sv(1): near “class”: syntax error, unexpected class, expecting IDENTIFIER or TYPE_IDENTIFIER

** Error: C:/questasim_10.0b/win32/vlog failed.

2

In reply to rakesh2learn:
An interface class is a new feature in SV IEEE 1800-2012 standard. You will need a more up to date version of your tool.