84 lines
2.0 KiB
Coq
84 lines
2.0 KiB
Coq
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//
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// Copyright (c) 1999 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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// SDW - Validate always case ( reg_value) case_item1; case_item2; case_item3; endcase
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// D:
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// time value1 value2
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// xxxx xxxx
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// 1 0000
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// 2 0000
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// 3 0001
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// 4 0001
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// 5 0010
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// 6 0010
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module main ;
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reg [3:0] value1,value2,value3;
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initial begin
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#1 ;
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#2 if (value2 != 0) begin
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$display("FAILED == at time 3, %b != 0", value2);
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$finish;
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end
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#2 if (value2 != 1) begin
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$display("FAILED == at time 5, %b != 1", value2);
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$finish;
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end
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#2 if (value2 != 2) begin
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$display("FAILED == at time 7, %b != 2", value2);
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$finish;
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end
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$display("PASSED");
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$finish;
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end
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initial begin
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#1 value1 = 4'b0000;
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#2 value1 = 4'b0001;
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#2 value1 = 4'b0010;
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end
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always case (value1)
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4'b0000 : begin
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value2 = 4'b0000 ;
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#2 ;
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end
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4'b0001 : begin
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value2 = 4'b0001 ;
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#2 ;
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end
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4'b0010 : begin
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value2 = 4'b0010 ;
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#2 ;
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end
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4'bxxxx : #2 ;
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default : begin
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$display("FAILED -- unexpected value1===%b", value1);
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$finish;
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end
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endcase
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endmodule
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