lm32_functions.v

Mon, 05 Apr 2010 20:23:04 +0100

author
Philip Pemberton <philpem@philpem.me.uk>
date
Mon, 05 Apr 2010 20:23:04 +0100
changeset 4
99b7b037ce82
parent 0
cd0b58aa6f83
child 26
73de224304c1
permissions
-rw-r--r--

add better comment re Xilinx Xst cache issues

philpem@0 1 // =============================================================================
philpem@0 2 // COPYRIGHT NOTICE
philpem@0 3 // Copyright 2006 (c) Lattice Semiconductor Corporation
philpem@0 4 // ALL RIGHTS RESERVED
philpem@0 5 // This confidential and proprietary software may be used only as authorised by
philpem@0 6 // a licensing agreement from Lattice Semiconductor Corporation.
philpem@0 7 // The entire notice above must be reproduced on all authorized copies and
philpem@0 8 // copies may only be made to the extent permitted by a licensing agreement from
philpem@0 9 // Lattice Semiconductor Corporation.
philpem@0 10 //
philpem@0 11 // Lattice Semiconductor Corporation TEL : 1-800-Lattice (USA and Canada)
philpem@0 12 // 5555 NE Moore Court 408-826-6000 (other locations)
philpem@0 13 // Hillsboro, OR 97124 web : http://www.latticesemi.com/
philpem@0 14 // U.S.A email: techsupport@latticesemi.com
philpem@0 15 // =============================================================================/
philpem@0 16 // FILE DETAILS
philpem@0 17 // Project : LatticeMico32
philpem@0 18 // File : lm32_functions.v
philpem@0 19 // Title : Common functions
philpem@0 20 // Version : 6.1.17
philpem@0 21 // : Initial Release
philpem@0 22 // Version : 7.0SP2, 3.0
philpem@0 23 // : No Change
philpem@0 24 // Version : 3.5
philpem@0 25 // : Added function to generate log-of-two that rounds-up to
philpem@0 26 // : power-of-two
philpem@0 27 // =============================================================================
philpem@0 28
philpem@0 29 function integer clogb2;
philpem@0 30 input [31:0] value;
philpem@0 31 begin
philpem@0 32 for (clogb2 = 0; value > 0; clogb2 = clogb2 + 1)
philpem@0 33 value = value >> 1;
philpem@0 34 end
philpem@0 35 endfunction
philpem@0 36
philpem@0 37 function integer clogb2_v1;
philpem@0 38 input [31:0] value;
philpem@0 39 reg [31:0] i;
philpem@0 40 reg [31:0] temp;
philpem@0 41 begin
philpem@0 42 temp = 0;
philpem@0 43 i = 0;
philpem@0 44 for (i = 0; temp < value; i = i + 1)
philpem@0 45 temp = 1<<i;
philpem@0 46 clogb2_v1 = i-1;
philpem@0 47 end
philpem@0 48 endfunction
philpem@0 49