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Altera_Forum's avatar
Altera_Forum
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15 years ago

How i can create a megafunction

Hello, I was doing my project of FPGA, and i need to put a demux in my project, I was trying to find in the library of quartus II, but i didn't find, then i wanna create a megafunction.

Someone can explain how i can create a megafunction, because i tried, but i don't know how to do. I wann create a megafunction of demux with 3 selectors input.

I will always be thankfull.

Thanks for all!!:D

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Oow, i am using schematic! I understood, and i did *----*

    thanks! thanks thanks!!!!!
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Probably you misused the Megafunction term.

    A megafunction is programmable by the user.

    You probably need a hierarchical design.

    If this is the case you can design your demux using schematic and logig gates and then convert it to a symbol that you can use in your top level schematic.

    The same can be done if you degign your demux using Verilog or VHDL.
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Depends on your design entry method. In HDL design entry, definition and instantiation of modules (Verilog) respectively components (VHDL) is a pretty basic language element, so I guess, you're referring to schematic entry.

    Here you can also create hierarchical sheets. Draw your intended sub-entitity (the demux logic) save it under a meaningful name and create a symbol for it, either using the default layout or by individually defining the shape. Then you can place instances of this "MegaFunction" in your top schematic or another sub-entity.