96 lines
2.5 KiB
Coq
96 lines
2.5 KiB
Coq
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/*
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* Copyright (c) 2000 Nadim Shaikli <nadim_shaikli@hotmail.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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/* This is made up from PR#63 */
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module main;
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reg one, clk;
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reg [1:0] a, b, c, passed;
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reg [7:0] count;
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always
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#1 one = ~one;
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// generate a clock
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always
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#10 clk = ~clk;
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initial
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begin
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$display ("\n<< BEGIN >>");
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one = 1'b1;
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clk = 1'b0;
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passed = 2'b00;
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count = 0;
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#15 a[1:0] = 2'b01;
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#10 a[1:0] = 2'b10;
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#20 $display ("\n<< END >>");
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if (passed == 2)
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$display ("PASSED");
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else
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$display ("FAILED");
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$finish;
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end
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always @(clk)
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begin
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// Problematic lines below -- comment them out to see timing skew
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b[1:0] <= #2.5 a[1:0];
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c[1:0] <= #7.8 a[1:0];
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end
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always @(one)
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count[7:0] <= count + 1;
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always @(count)
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begin
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case ( count )
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'd25:
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if (b[1:0] == 2'b01)
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begin
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$display ("@ %0t - Got ONE", $time);
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passed = passed + 1;
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end
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else
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$display ("@ %0t - failure", $time);
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'd29:
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if (b[1:0] == 2'b01)
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begin
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$display ("@ %0t - Got ONE", $time);
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passed = passed + 1;
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end
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else
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$display ("@ %0t - failure", $time);
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default:
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$display ("@ %0t - no count", $time);
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endcase
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end
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// Waves definition
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// initial
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// begin
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// $recordvars("primitives", "drivers");
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// $dumpfile("out.dump");
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// $dumpvars(5, main);
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// Line below ought to work
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// $dumpvars;
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// end
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endmodule // main
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