Subversion Repositories myhdl_lfsr

#dictionary of width:taps

#taken from table by Roy Ward, Tim Molteno currently available at

#http://courses.cse.tamu.edu/walker/csce680/lfsr_table.pdf

#More taps may be added in this fashion if needed.  The table only lists

#2-tap and 4-tap entries, but any number of taps may potentially be 

#used provided that they fit the width

#Powers of 2 and some prime numbers:

lfsr_tap_table = {

            2:[2,1],

            3:[3,2],

            4:[4,3],

            8:[8,6,5,4],

            9:[9,5],

            12:[12,11,8,6],

            16:[16,14,13,11],

            17:[17,14],

            24:[24,23,21,20],

            29:[29,27],

            31:[31,28],

            32:[32,30,26,25],

            33:[33,20],

            37:[37,36,33,31],

            43:[43,42,38,37],

            47:[47,42],

            53:[53,52,51,47],

            64:[64,63,61,60],

            65:[65,47],

            96:[96,90,87,86],

            101:[101,100,95,94],

            128:[128,127,126,121],

            129:[129,124],

            256:[256,254,251,246],

            257:[257,245],

            384:[384,378,369,368],

            512:[512,510,507,504],

            513:[513,428],

            768:[768,764,751,749],

            1024:[1024,1015,1002,1001],

            2048:[2048,2035,2034,2029],

            4096:[4096,4095,4081,4069],

        }