RE: [sv-bc] query about system verilog interfaces

20.2 says that an interface "can contain smaller interfaces".

 

Shalom

 

________________________________

From: owner-sv-bc@server.eda-stds.org
[mailto:owner-sv-bc@server.eda-stds.org] On Behalf Of Brad Pierce
Sent: Wednesday, August 09, 2006 9:34 AM
To: sv-bc@server.eda-stds.org
Subject: RE: [sv-bc] query about system verilog interfaces

 

Suman,

 

For why the LRM is silent on such issues, see 

 

      http://www.eda-stds.org/sv-bc/hm/4898.html
<http://www.eda-stds.org/sv-bc/hm/4898.html> 

 

To test your netlist, drive it and the original RTL with the same test
bench.

 

But, yes, your netlist is reasonable except for a missing space in
"\u2.u1.b;"

 

There are syntax errors in your interface instantiations though.  They
should be as follows

 

interface ifc1;
  wire a, b;
endinterface

 

interface ifc2;
  wire x, y;
  ifc1 u1();
endinterface


module top;
  ifc2 u2();
  bot IO (.u(u2));
endmodule


module bot (ifc2 u);
endmodule

-- Brad

________________________________

From: owner-sv-bc@eda-stds.org [mailto:owner-sv-bc@eda-stds.org] On
Behalf Of Suman Nandan
Sent: Tuesday, August 08, 2006 11:11 PM
To: sv-bc@eda-stds.org
Subject: [sv-bc] query about system verilog interfaces

Hello Experts, 
What should be output of the following RTL after systhesis ? 
----------------------------------------------------- 
interface ifc1; 
  wire a, b; 
endenterface 

interface ifc2; 
  wire x, y; 
  ifc1 u1; 
endinterface 

module top; 
  ifc2 u2; 

  bot IO (.u(u2)); 
endmodule 

module bot (ifc2 u); 
endmodule 
------------------------------------------------- 
Should it compile to something like : 
------------------------------------------------ 
module top; 
  wire \u2.x , \u2.y , \u2.u1.a , \u2.u1.b; 

  bot (.\u.x (\u2.x ), .\u.y (\u2.y ), .\u.u1.a (\u2.u1.a ), .\u.u1.b 
(\u2.u1.b )); 
endmodule; 

module bot (inout \u.x , \u.y , \u.u1.a , \u.u1.b ); 
endmodule 
--------------------------------------------------------------------- 
I could not find any lead from the LRM 1800-2005 regarding 
instanciation of interfaces within inerface. 
Can you please help me out ? 

Thanks,
Suman.