82 lines
2.4 KiB
Coq
82 lines
2.4 KiB
Coq
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/*
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* Copyright (c) 2001 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 test was inspired by PR#539. We check that the calculated bit
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* select of a net in a continuous assignment gets bits in the right
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* order and position. The trick here is that the bits are numbered
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* from MSB to LSB.
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*/
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module main;
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reg [63:0] target0 = 64'h0040_2000_0000_0000;
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reg [64:1] target1 = 64'h0040_2000_0000_0000;
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reg [6:0] idx;
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wire mux0 = target0[idx];
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wire mux1 = target1[idx+1];
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initial begin
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$display( "Using constant indices:" );
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$display( " %b=v[45]", target0[45] );
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if (target0[45] !== 1'b1) begin
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$display("FAILED -- target0[45] != 1");
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$finish;
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end
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$display( " %b=v[54]", target0[54] );
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if (target0[54] !== 1'b1) begin
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$display("FAILED -- target0[54] != 1");
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$finish;
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end
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$display( " %b=v[18]", target0[18] );
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if (target0[18] !== 1'b0) begin
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$display("FAILED -- target0[18] != 0");
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$finish;
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end
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$display( " %b=v[ 9]", target0[9] );
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if (target0[9] !== 1'b0) begin
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$display("FAILED -- target0[ 9] != 0");
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$finish;
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end
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$display( "Using calcuated indices:" );
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for (idx = 0 ; idx < 64 ; idx = idx + 1) begin
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#1 $display("target0[%2d]=%b, mux0=%b", idx, target0[idx], mux0);
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$display("target1[%2d]=%b, mux1=%b", idx+1, target1[idx+1], mux1);
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if (target0[idx] !== mux0) begin
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$display("FAILED -- target0[idx] != mux0");
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$finish;
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end
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if (target1[idx+1] !== mux1) begin
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$display("FAILED -- target1[idx+1] != mux1");
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$finish;
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end
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end
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$display("PASSED");
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end
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endmodule // main
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