// DESCRIPTION: Verilator: Verilog Test module // // This file ONLY is placed under the Creative Commons Public Domain, for // any use, without warranty, 2008 by Wilson Snyder. // SPDX-License-Identifier: CC0-1.0 module t (/*AUTOARG*/ // Inputs clk ); input clk; reg [2:0] in; wire a,y,y_fixed; wire b = in[0]; wire en = in[1]; pullup(a); ChildA childa ( .A(a), .B(b), .en(en), .Y(y),.Yfix(y_fixed) ); initial in=0; // Test loop always @ (posedge clk) begin in <= in + 1; $display ( "a %d b %d en %d y %d yfix: %d)" , a, b, en, y, y_fixed); if (en) begin // driving b // a should be b // y and yfix should also be b if (a!=b || y != b || y_fixed != b) begin $display ( "Expected a %d y %b yfix %b" , a, y, y_fixed); $stop; end end else begin // not driving b // a should be 1 (pullup) // y and yfix shold be 1 if (a!=1 || y != 1 || y_fixed != 1) begin $display( "Expected a,y,yfix == 1"); $stop; end end if (in==3) begin $write("*-* All Finished *-*\n"); $finish; end end endmodule module ChildA(inout A, input B, input en, output Y, output Yfix); // workaround wire a_in = A; ChildB childB(.A(A), .Y(Y)); assign A = en ? B : 1'bz; ChildB childBfix(.A(a_in),.Y(Yfix)); endmodule module ChildB(input A, output Y); assign Y = A; endmodule