litex/verilog/lm32/lm32_functions.v

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2011-12-13 11:33:12 -05:00
// ==================================================================
// >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
// ------------------------------------------------------------------
// Copyright (c) 2006-2011 by Lattice Semiconductor Corporation
// ALL RIGHTS RESERVED
// ------------------------------------------------------------------
//
// IMPORTANT: THIS FILE IS AUTO-GENERATED BY THE LATTICEMICO SYSTEM.
//
// Permission:
//
// Lattice Semiconductor grants permission to use this code
// pursuant to the terms of the Lattice Semiconductor Corporation
// Open Source License Agreement.
//
// Disclaimer:
//
// Lattice Semiconductor provides no warranty regarding the use or
// functionality of this code. It is the user's responsibility to
// verify the user's design for consistency and functionality through
// the use of formal verification methods.
//
// --------------------------------------------------------------------
//
// Lattice Semiconductor Corporation
// 5555 NE Moore Court
// Hillsboro, OR 97214
// U.S.A
//
// TEL: 1-800-Lattice (USA and Canada)
// 503-286-8001 (other locations)
//
// web: http://www.latticesemi.com/
// email: techsupport@latticesemi.com
//
// --------------------------------------------------------------------
// FILE DETAILS
// Project : LatticeMico32
// File : lm32_functions.v
// Title : Common functions
// Version : 6.1.17
// : Initial Release
// Version : 7.0SP2, 3.0
// : No Change
// Version : 3.5
// : Added function to generate log-of-two that rounds-up to
// : power-of-two
// =============================================================================
function integer clogb2;
input [31:0] value;
begin
for (clogb2 = 0; value > 0; clogb2 = clogb2 + 1)
value = value >> 1;
end
endfunction
function integer clogb2_v1;
input [31:0] value;
reg [31:0] i;
reg [31:0] temp;
begin
temp = 0;
i = 0;
for (i = 0; temp < value; i = i + 1)
temp = 1<<i;
clogb2_v1 = i-1;
end
endfunction