VHDL Subscripts

Discussion in 'VHDL' started by Cameron, Charles B., Feb 26, 2004.

  1. I was surprised to discover that Altera's MaxPlus II interpreted the
    signal name z1 as z(1), something I only guessed after extensive head
    scratching. I had declared both z and z1 to be of type
    standard_logic_vector. Once I renamed the signal z1 as zint, my problem
    went away. However, in pursuing the cause of my confusion I have found
    no reference that states an equivalence between z1 and z(1). Can
    anybody steer me to a reference that addresses this point?

    Charles B. Cameron
    Cameron, Charles B., Feb 26, 2004
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  2. Cameron, Charles B. a écrit:
    This is a MaxPlus+II problem, not a VHDL problem (you would probably
    encounter it with Verilog too). I suggest to change from MaxPlus+II (now
    becoming obsolete) to QuartusII.
    Nicolas Matringe, Feb 26, 2004
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  3. Many thanks for telling me this. I suspected it, but I couldn't verify
    it independently. At my university we use the Altera UP-1 and UP-2
    boards with student licenses, which effectively do not expire. I
    haven't figured out a way to use Quartus II in the same manner. If
    anyone knows how to handle this, too, then we could stop using
    MaxPlus+II immediately. I much prefer the Quartus II interface and I've
    found that it does a better job at finding fast netlists than MaxPlus+II

    Charles B. Cameron
    Cameron, Charles B., Feb 26, 2004
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