131 lines
2.7 KiB
Verilog
131 lines
2.7 KiB
Verilog
//
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// Copyright (c) 1999 Steven Wilson (stevew@home.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 variable right shift in always
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module main;
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reg globvar;
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reg [7:0] var1,var2,var3;
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reg error;
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reg [7:0] value;
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always @(var1 or var2)
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value = var1 >> var2;
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initial
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begin
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error = 0;
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#1 ;
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var1 = 8'h80;
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var2 = 8'h7;
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#1;
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if(value !== 8'h1)
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begin
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error = 1;
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$display ("FAILED - 80 >> 7 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h6;
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#1;
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if(value !== 8'h2)
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begin
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error = 1;
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$display ("FAILED - 80 >> 6 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h5;
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#1;
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if(value !== 8'h4)
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begin
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error = 1;
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$display ("FAILED - 80 >> 5 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h4;
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#1;
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if(value !== 8'h8)
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begin
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error = 1;
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$display ("FAILED - 80 >> 4 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h3;
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#1;
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if(value !== 8'h10)
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begin
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error = 1;
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$display ("FAILED - 80 >> 3 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h2;
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#1;
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if(value !== 8'h20)
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begin
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error = 1;
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$display ("FAILED - 80 >> 2 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h1;
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#1;
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if(value !== 8'h40)
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begin
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error = 1;
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$display ("FAILED - 80 >> 1 is %h",value);
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end
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#1 ;
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var1 = 8'h80;
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var2 = 8'h0;
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#1;
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if(value !== 8'h80)
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begin
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error = 1;
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$display ("FAILED - 80 >> 0 is %h",value);
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end
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#1 ;
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var1 = 8'ha5;
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var2 = 8'h7;
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#1;
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if(value !== 8'h01)
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begin
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error = 1;
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$display ("FAILED - a5 >> 7 is %h",value);
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end
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#1 ;
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var1 = 8'ha5;
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var2 = 8'h1;
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#1;
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if(value !== 8'h52)
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begin
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error = 1;
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$display ("FAILED - aa >> 1 is %h",value);
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end
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if(error === 0)
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$display("PASSED");
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end
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endmodule // main
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