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Re: [f-cpu] Alternative ROP2 Implementation

Michael Riepe wrote:

During those boring easter holidays ;) I have found another way to
implement the ROP2 unit.  It's based on the formulas (in pseudo-C):

      a &  b   ==  b ?  a :  0      // and
      a & ~b   ==  b ?  0 :  a      // andn
      a ^  b   ==  b ? ~a :  a      // xor
      a |  b   ==  b ?  1 :  a      // or
    ~(a |  b)  ==  b ?  0 : ~a      // nor
    ~(a ^  b)  ==  b ?  a : ~a      // xnor
      a | ~b   ==  b ?  a :  1      // orn
    ~(a &  b)  ==  b ? ~a :  1      // nand
                   b ?  a :  c      // mux
                   b ?  c :  a      // muxr (new: "reversed" mux)

It loooks nice. is there any way to get some other logic in like full
word sign extends/0/1 's
Ben.


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