Check the interface type using parameterized interface

SystemVerilog
,
1

Hello! I want to check the interface type and make error if it’s not correct.

interface prm_if #(parameter int P_MODE_PRM = 0) ();
...
endinterface

// I want to write like this, but it's compile errror.
module prm_if_dut (prm_if #( .P_MODE_PRM(1) ) p);
...
endmodule

module top

prm_if #(.P_MODE_PRM(2)) prm_bus();  // P_MODE_PRM is not correct for prm_if_dut
prm_if_dut dut(prm_bus);  // I want to make error because the Mode is not corect
                          // P_MODE_PRM must be 1 for prm_if_dut, but it's 2 so I expect to occur syntax error here.

Do I have some mistake or do you have any solution about this?

Thanks!

2

Unfortunately, you cannot parameterize an interface port declaration. It will inherit the parameterization of what’s connected to it.
You can put a check and create an elaboration error if the value is not 2.

module prm_if_dut (prm_if  p);
  if (p.P_MODE_PRM != 1) $error("p.P_MODE_PRM != 1"); // error at elaboration
// ...
endmodule
module top;
  prm_if #(.P_MODE_PRM(2)) prm_bus();
  prm_if_dut DUT(prm_bus);
endmodule

interface prm_if #(parameter int P_MODE_PRM = 0) ();
//...
endinterface
2 Likes
3

Thanks for replying!