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Altera_Forum
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13 years ago

Error fed by 5 non-global control signals -- only 4 control signals may be non-global

Guys,

I got error on compiling PCI-compiler

Error fed by 5 non-global control signals -- only 4 control signals may be non-global

Is it related with pin assigment ?

What should I fix ?

I'm using Quartus II version 8 and Cyclone II EP2C8Q208

Thanks for helping

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    You need to assign some signals to global networks. I don't know CII well but I know that later families can't feed all the clock signals in a LAB from local routing; some of them have to come from global routing as well. Use the assignment editor to make the assignments, or google "Quartus assign global" to find examples of how it's done.

    Cheers, Adrian
  • Altera_Forum's avatar
    Altera_Forum
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    --- Quote Start ---

    You need to assign some signals to global networks. I don't know CII well but I know that later families can't feed all the clock signals in a LAB from local routing; some of them have to come from global routing as well. Use the assignment editor to make the assignments, or google "Quartus assign global" to find examples of how it's done.

    Cheers, Adrian

    --- Quote End ---

    Thanks for your suggestion Adrian,

    how about Cyclone II clock, is it from crystal or from PLL, I'm abit confuse...

    thanks
  • Altera_Forum's avatar
    Altera_Forum
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    I don't believe any of our devices have on-board crystals (disclaimer: I'm a software guy, not hardware) so you have to generate the signals off-chip and feed them into the device through a pin. At that point you can use the clock directly, or use it to drive a PLL and use the PLL-generated clock. Check out http://www.altera.com/literature/lit-cyc2.jsp for more details on the hardware; to instantiate a PLL using Quartus, see http://www.altera.com/literature/ug/ug_altpll.pdf.