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41 lines
1.8 KiB
PHP
41 lines
1.8 KiB
PHP
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// Copyright 2007 Altera Corporation. All rights reserved.
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// Altera products are protected under numerous U.S. and foreign patents,
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// maskwork rights, copyrights and other intellectual property laws.
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//
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// This reference design file, and your use thereof, is subject to and governed
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// by the terms and conditions of the applicable Altera Reference Design
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// License Agreement (either as signed by you or found at www.altera.com). By
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// using this reference design file, you indicate your acceptance of such terms
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// and conditions between you and Altera Corporation. In the event that you do
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// not agree with such terms and conditions, you may not use the reference
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// design file and please promptly destroy any copies you have made.
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//
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// This reference design file is being provided on an "as-is" basis and as an
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// accommodation and therefore all warranties, representations or guarantees of
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// any kind (whether express, implied or statutory) including, without
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// limitation, warranties of merchantability, non-infringement, or fitness for
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// a particular purpose, are specifically disclaimed. By making this reference
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// design file available, Altera expressly does not recommend, suggest or
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// require that this reference design file be used in combination with any
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// other product not provided by Altera.
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/////////////////////////////////////////////////////////////////////////////
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// helper function to compute LOG base 2
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//
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// NOTE - This is a somewhat abusive definition of LOG2(v) as the
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// number of bits required to represent "v". So log2(256) will be
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// 9 rather than 8 (256 = 9'b1_0000_0000). I apologize for any
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// confusion this may cause.
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//
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function integer log2;
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input integer val;
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begin
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log2 = 0;
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while (val > 0) begin
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val = val >> 1;
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log2 = log2 + 1;
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end
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end
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endfunction
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