stub.v

来自「openaccess与verilog互相转化时所用的源代码」· Verilog 代码 · 共 35 行

// Test the reader's ability to handle undefined modules in the Verilog
// input.  The reader should create "stub" references to these modules
// using the union of all interfaces that are defined on the module.  Also test
// the reader's ability to detect and detach empty modules which should be
// created as black boxes.


module empty(a, b, c);
    input	    a;
    input   [1:0]   b;
    output	    c;
endmodule


module top();
    wire            wireToA, wireToC, wireToX, wireToZ;
    wire    [1:0]   busToB, busToY;
    wire    [3:0]   wideBusToB, wideBusToY;
    
    empty   designInst(.a(wireToA), .b(busToB), .c(wireToC));
    
    stub    lowNames(.c(wireToC), .a(wireToA), .b(busToB)),
            highNames(.y(busToY), .z(wireToZ), .x(wireToX));
            
    stub    vectorInst[1:0](.y(wideBusToY), .z(wireToZ), .x(wireToX));

    stub    scalarOrder(wireToA, busToB, wireToC, 
                        wireToX, busToY, wireToZ);
            
    stub    vectorOrder[1:0](wireToA, wideBusToB, wireToC,
                             wireToX, wideBusToY, wireToZ);
   
endmodule