[sv-bc] Specifying modport on array of interfaces..

Hi there,

 

Here we are trying to use array of interfaces and specify modport. 

In case-1, we instantiate array of interfaces in the submodule and
specify the modport list name in the top level module

And in case-2, we instantiate the array of interface along with modport
specified. 

 

So, could you please clarify which one would be the correct way?  

 

Thanks and Regards,

-Anand

 

***********************************************

* CASE 1:

***********************************************

interface inf ();

 logic   din;

 logic   dout;

 

 modport x(output dout, input din);

 modport y(inout dout, inout din);

endinterface: inf

 

module sub(in, U1, out);

 input [1:0] in;

 output [1:0] out;

  

 inf U1 [2];

endmodule

 

module top(in, out);

 input      [1:0] in;

 output    [1:0] out;

 

 inf U1 [2] ();

 sub  inst_sub  (.U1(U1.x),.in(in), out(out));

endmodule

 

***********************************************

* CASE 2:

***********************************************

interface inf ();

 logic   din;

 logic   dout;

 

 modport x(output dout, input din);

 modport y(inout dout, inout din);

endinterface: inf

 

module sub(in, U1, out);

 input [1:0] in;

 output [1:0] out;

  

 inf.x U1[2];

endmodule

 

module top(in, out);

 input      [1:0] in;

 output    [1:0] out;

 

 inf U1 [2] ();

 sub  inst_sub  (.U1(U1), .in(in), out(out));

endmodule

 


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