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Altera_Forum's avatar
Altera_Forum
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14 years ago

General Purpose I/O Pin Names

We intend to use the CycloneIII for a project, and we need to generate high frequency signals from 0 to 5 volts. Can the FPGA produce a signal that goes up to 5 volts and has a rise time of about 200 ps? Maybe this is general information, but its a question we couldn't answer by searching through the handbook/datasheet. Any help would be appreciated!

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Cyclone 3 handbook:

    p284 "Cyclone III Devices Recommended Operating Conditions"

    VCCIO = 3.3V or lower, so no 5V output sorry!

    You need an external 5V driver.

    Cheers,

    Dave
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Found that right before I saw this, thank you though!

    Also, is there anyway to find exactly what pins are general purpose i/o? I have found only a few mentions to D0, D1, D2..etc pins, but I cannot find whether or not they are GPIO or not.
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    --- Quote Start ---

    Also, is there anyway to find exactly what pins are general purpose i/o? I have found only a few mentions to D0, D1, D2..etc pins, but I cannot find whether or not they are GPIO or not.

    --- Quote End ---

    There is two ways;

    1) On the handbook page, there is a link to pinout files. Those files list all the pin features.

    2) Create a project in Quartus and select the device you want to use. Open the pin planner and its a GUI with all the pin types.

    Cheers,

    Dave