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qaztronic |
// Chuck Benz, Hollis, NH Copyright (c)2002
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//
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// The information and description contained herein is the
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// property of Chuck Benz.
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//
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// Permission is granted for any reuse of this information
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// and description as long as this copyright notice is
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// preserved. Modifications may be made as long as this
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// notice is preserved.
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// per Widmer and Franaszek
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module decode_8b10b (datain, dispin, dataout, dispout, code_err, disp_err) ;
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input [9:0] datain ;
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input dispin ;
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output [8:0] dataout ;
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output dispout ;
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output code_err ;
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output disp_err ;
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wire ai = datain[0] ;
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wire bi = datain[1] ;
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wire ci = datain[2] ;
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wire di = datain[3] ;
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wire ei = datain[4] ;
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wire ii = datain[5] ;
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wire fi = datain[6] ;
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wire gi = datain[7] ;
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wire hi = datain[8] ;
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wire ji = datain[9] ;
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wire aeqb = (ai & bi) | (!ai & !bi) ;
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wire ceqd = (ci & di) | (!ci & !di) ;
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wire p22 = (ai & bi & !ci & !di) |
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(ci & di & !ai & !bi) |
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( !aeqb & !ceqd) ;
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wire p13 = ( !aeqb & !ci & !di) |
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( !ceqd & !ai & !bi) ;
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wire p31 = ( !aeqb & ci & di) |
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( !ceqd & ai & bi) ;
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wire p40 = ai & bi & ci & di ;
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wire p04 = !ai & !bi & !ci & !di ;
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wire disp6a = p31 | (p22 & dispin) ; // pos disp if p22 and was pos, or p31.
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wire disp6a2 = p31 & dispin ; // disp is ++ after 4 bits
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wire disp6a0 = p13 & ! dispin ; // -- disp after 4 bits
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wire disp6b = (((ei & ii & ! disp6a0) | (disp6a & (ei | ii)) | disp6a2 |
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(ei & ii & di)) & (ei | ii | di)) ;
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// The 5B/6B decoding special cases where ABCDE != abcde
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wire p22bceeqi = p22 & bi & ci & (ei == ii) ;
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wire p22bncneeqi = p22 & !bi & !ci & (ei == ii) ;
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wire p13in = p13 & !ii ;
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wire p31i = p31 & ii ;
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wire p13dei = p13 & di & ei & ii ;
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wire p22aceeqi = p22 & ai & ci & (ei == ii) ;
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wire p22ancneeqi = p22 & !ai & !ci & (ei == ii) ;
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wire p13en = p13 & !ei ;
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wire anbnenin = !ai & !bi & !ei & !ii ;
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wire abei = ai & bi & ei & ii ;
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wire cdei = ci & di & ei & ii ;
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wire cndnenin = !ci & !di & !ei & !ii ;
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// non-zero disparity cases:
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wire p22enin = p22 & !ei & !ii ;
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wire p22ei = p22 & ei & ii ;
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//wire p13in = p12 & !ii ;
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//wire p31i = p31 & ii ;
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wire p31dnenin = p31 & !di & !ei & !ii ;
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//wire p13dei = p13 & di & ei & ii ;
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wire p31e = p31 & ei ;
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wire compa = p22bncneeqi | p31i | p13dei | p22ancneeqi |
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p13en | abei | cndnenin ;
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wire compb = p22bceeqi | p31i | p13dei | p22aceeqi |
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p13en | abei | cndnenin ;
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wire compc = p22bceeqi | p31i | p13dei | p22ancneeqi |
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p13en | anbnenin | cndnenin ;
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wire compd = p22bncneeqi | p31i | p13dei | p22aceeqi |
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p13en | abei | cndnenin ;
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wire compe = p22bncneeqi | p13in | p13dei | p22ancneeqi |
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p13en | anbnenin | cndnenin ;
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wire ao = ai ^ compa ;
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wire bo = bi ^ compb ;
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wire co = ci ^ compc ;
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wire do = di ^ compd ;
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wire eo = ei ^ compe ;
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wire feqg = (fi & gi) | (!fi & !gi) ;
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wire heqj = (hi & ji) | (!hi & !ji) ;
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wire fghj22 = (fi & gi & !hi & !ji) |
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(!fi & !gi & hi & ji) |
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( !feqg & !heqj) ;
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wire fghjp13 = ( !feqg & !hi & !ji) |
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( !heqj & !fi & !gi) ;
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wire fghjp31 = ( (!feqg) & hi & ji) |
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( !heqj & fi & gi) ;
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wire dispout = (fghjp31 | (disp6b & fghj22) | (hi & ji)) & (hi | ji) ;
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wire ko = ( (ci & di & ei & ii) | ( !ci & !di & !ei & !ii) |
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(p13 & !ei & ii & gi & hi & ji) |
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(p31 & ei & !ii & !gi & !hi & !ji)) ;
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wire alt7 = (fi & !gi & !hi & // 1000 cases, where disp6b is 1
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((dispin & ci & di & !ei & !ii) | ko |
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(dispin & !ci & di & !ei & !ii))) |
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(!fi & gi & hi & // 0111 cases, where disp6b is 0
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(( !dispin & !ci & !di & ei & ii) | ko |
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( !dispin & ci & !di & ei & ii))) ;
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wire k28 = (ci & di & ei & ii) | ! (ci | di | ei | ii) ;
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// k28 with positive disp into fghi - .1, .2, .5, and .6 special cases
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wire k28p = ! (ci | di | ei | ii) ;
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wire fo = (ji & !fi & (hi | !gi | k28p)) |
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(fi & !ji & (!hi | gi | !k28p)) |
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(k28p & gi & hi) |
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(!k28p & !gi & !hi) ;
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wire go = (ji & !fi & (hi | !gi | !k28p)) |
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(fi & !ji & (!hi | gi |k28p)) |
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(!k28p & gi & hi) |
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(k28p & !gi & !hi) ;
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wire ho = ((ji ^ hi) & ! ((!fi & gi & !hi & ji & !k28p) | (!fi & gi & hi & !ji & k28p) |
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(fi & !gi & !hi & ji & !k28p) | (fi & !gi & hi & !ji & k28p))) |
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(!fi & gi & hi & ji) | (fi & !gi & !hi & !ji) ;
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wire disp6p = (p31 & (ei | ii)) | (p22 & ei & ii) ;
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wire disp6n = (p13 & ! (ei & ii)) | (p22 & !ei & !ii) ;
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wire disp4p = fghjp31 ;
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wire disp4n = fghjp13 ;
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assign code_err = p40 | p04 | (fi & gi & hi & ji) | (!fi & !gi & !hi & !ji) |
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(p13 & !ei & !ii) | (p31 & ei & ii) |
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(ei & ii & fi & gi & hi) | (!ei & !ii & !fi & !gi & !hi) |
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(ei & !ii & gi & hi & ji) | (!ei & ii & !gi & !hi & !ji) |
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(!p31 & ei & !ii & !gi & !hi & !ji) |
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(!p13 & !ei & ii & gi & hi & ji) |
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(((ei & ii & !gi & !hi & !ji) |
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(!ei & !ii & gi & hi & ji)) &
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! ((ci & di & ei) | (!ci & !di & !ei))) |
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(disp6p & disp4p) | (disp6n & disp4n) |
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(ai & bi & ci & !ei & !ii & ((!fi & !gi) | fghjp13)) |
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(!ai & !bi & !ci & ei & ii & ((fi & gi) | fghjp31)) |
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(fi & gi & !hi & !ji & disp6p) |
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(!fi & !gi & hi & ji & disp6n) |
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(ci & di & ei & ii & !fi & !gi & !hi) |
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(!ci & !di & !ei & !ii & fi & gi & hi) ;
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assign dataout = {ko, ho, go, fo, eo, do, co, bo, ao} ;
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// my disp err fires for any legal codes that violate disparity, may fire for illegal codes
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assign disp_err = ((dispin & disp6p) | (disp6n & !dispin) |
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(dispin & !disp6n & fi & gi) |
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(dispin & ai & bi & ci) |
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(dispin & !disp6n & disp4p) |
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(!dispin & !disp6p & !fi & !gi) |
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(!dispin & !ai & !bi & !ci) |
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(!dispin & !disp6p & disp4n) |
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(disp6p & disp4p) | (disp6n & disp4n)) ;
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endmodule
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