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

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