iverilog/ivtest/ivltests/assign_delay.v

46 lines
1.3 KiB
Verilog

/*
* Copyright (c) 2000 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/*
* This test captures the essence of PR#40, namely the possibility
* that the continuous assign from a reg to a wire may have a delay.
*/
module test;
wire a;
reg b;
assign #10 a = b;
initial begin
b = 0;
# 20 b = 1;
# 5 if (a !== 0) begin
$display("FAILED -- a is %b", a);
$finish;
end
# 6 if (a !== 1) begin
$display("FAILED -- a is %b, should be 1", a);
$finish;
end
$display("PASSED");
end
endmodule