Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

10 bit shift register megafunction

When I use the Megafunction wizard to make a 10 bit shift register, the result does not have the I/O lines connected and there is what looks to be a table inside the design. I am not able to connect nodes to this part. What am I missing? I also have a 10 bit counter that behaves the same way.

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I'm not using schematic entry usually, but if I go to the schematic entry symbol tool and select a lpm_shiftreg MegaFunction, I can't manage to create a block symbol without in- or outputs. I really wonder, how you achieved it?

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    The design is set up as a project for the Max II family (EPM240). Is the limitation due to that? As far as creating the part, I just used the Wizard and entered '10' as the number of bits. If I change it to 8, it works fine.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    There's no difference between FPGA and MAX II in this regard. I think, it's just some confusion in handling the MegaWizard tool.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    So, tonite everything is working perfectly. I have no explanation except that it is Friday and some software elf finally decided to get to work. I will say that yesterday, Quartus was a fresh install, and maybe it took several invocations before the bits got connected.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    --- Quote Start ---

    So, tonite everything is working perfectly. I have no explanation except that it is Friday and some software elf finally decided to get to work. I will say that yesterday, Quartus was a fresh install, and maybe it took several invocations before the bits got connected.

    --- Quote End ---

    Hi Corwin,

    there are two ways to generated a "symbol" for your block. When you use the Megawizard

    it will generated a symbol for for you with all the ports.

    I assume the "symbol" you posted in your first post is generated with the so-called block editor. It is available when you opened the schematic view. You have to define the ports as properties. As far as a know you have to use "Conduits" to connect such blocks. I never used that in my designs.

    Kind regards

    GPK