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  ../images/main/bullet_star_pink.gif Modport Expression

A modport expression allows elements of arrays and structures, concatenations of elements, and assignment pattern expressions of elements declared in an interface to be included in a modport list. This modport expression is explicitly named with a port identifier, visible only through the modport connection.

   

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One of the best way to use this feature is to use with genvar on modports to make parameterizable interface. Below examples shows exactly same.

   

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  ../images/main/4blue_dots_bullets.gif Example : Modport Expression
   

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  1 // TODO : Complete this example
  2 //+++++++++++++++++++++++++++++++++++++++++++++++++
  3 // Define the interface
  4 //+++++++++++++++++++++++++++++++++++++++++++++++++
  5 interface arb_if #(num_agents = 1) (input clk);
  6   logic   reset;
  7   logic  [num_agents-1 : 0] req;
  8   logic  [num_agents-1 : 0] gnt;
  9   //=================================================
 10   // Modport inside a generate block
 11   //=================================================
 12   for (genvar i=0; i< num_agents; i++) begin: arb
 13      modport arb (input .creq (req[i], clk, reset, output .cgnt (gnt[i]) );
 14      modport tb (output .creq (req[i], input clk, reset, .cgnt (gnt[i]) );
 15   end
 16 
 17 endinterface
 18 
 19 //+++++++++++++++++++++++++++++++++++++++++++++++++
 20 //  Testbench Top file 
 21 //+++++++++++++++++++++++++++++++++++++++++++++++++
 22 module interface_modport_expression();
 23  
 24  logic clk = 0;
 25  always  #1  clk ++;
 26  
 27  arb_if arbif(clk);
 28 
 29 initial begin
 30   #100  $finish;
 31 end
 32 
 33 endmodule
You could download file interface_modport_expression.sv here
   

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  ../images/main/4blue_dots_bullets.gif Simulation : Modport Expression
   

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Deepak Kumar Tala - All rights reserved

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