95 lines
2.3 KiB
Coq
95 lines
2.3 KiB
Coq
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/*
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* Copyright (c) 2000 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/*
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* This program tests that a non-integer delay gets its extra
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* precision accounted for if the timescale supports it. In this
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* example, set the units to 1ms, but set the precision so that the
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* numbers can be given accurate to .1ms. This should cause a delay
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* of 2.4 and 2.6 to really be different.
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*/
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`timescale 1ms / 100us
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module main;
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reg err;
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reg clk;
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reg out1, out2;
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realtime time1;
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realtime time2;
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real eps;
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always @(posedge clk) #2.4 begin
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$display($time,,$realtime, " set out1 == 1");
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time1 = $realtime;
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out1 = 1;
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end
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always @(posedge clk) #2.6 begin
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$display($time,,$realtime, " set out2 == 1");
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time2 = $realtime;
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out2 = 1;
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end
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initial begin
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clk = 0;
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out1 = 0;
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out2 = 0;
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time1 = 0;
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time2 = 0;
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err = 0;
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$timeformat(-3,1,"ms",5);
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#1 if (out1 !== 0) begin
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$display("Error -- out1 s/b 0 at time $time but is=%x", out1);
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err =1 ;
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end
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clk = 1;
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#3 if (out1 !== 1) begin
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$display("Error -- out1 s/b 1 at time $time but is=%x", out1);
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err =1 ;
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end
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eps = time1 - 3.4;
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if (eps < 0.0)
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eps = 0.0 - eps;
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if (eps > 0.0001) begin
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$display("Error -- time1 s/b 3.4 but is=%t", time1);
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err =1 ;
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end
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#1 eps = time2 - 3.6;
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if (eps < 0.0)
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eps = 0.0 - eps;
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if (eps > 0.0001) begin
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$display("Error -- time2 s/b 3.6 but is=%t, ", time2);
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err =1 ;
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end
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// Use a gold file to check this version.
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end // initial begin
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endmodule // main
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