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Altera_Forum's avatar
Altera_Forum
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10 years ago

Using Altera GPIO Lite Ip core as bidirectional DDR

Hi,

I have a signal whose data rate is 480Mbps. it is a DDR signal. I would like to know whether by using GPIO Ip i can acheive this ?. What would be the IO standard for the ddr output of GPIO IP ? Can i have LVCMOS 1.2V as the IO standard for the ddr IO ?

Thanks in advance

Sujesh

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    Yes, that sounds reasonable.

    Yes, the GPIO IP will allow you to generate a DDR signal you can drive to a pad. The same IP supports bidirectional ports as well.

    You can use 1.2V LVCMOS as the I/O standard, although that's not very common. As the tools will tell you a 1.2V I/O standard may have lower performance than I/O standards at higher voltages.

    Finally, as I frequently state on this forum - put a simple design together, constrain it and run it through Quartus. Quartus will answer all the questions you've asked.

    Cheers,

    Alex
  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    Thanks Alex,

    I am new to FPGA design and i dont have Altera in my PC: I am in a project design phase(so i came across a situation where i need an IO with 480Mbps LVCMOS 1.2V). Sorry for the inconvenience, I hope i can have a Altera Licence soon.

    Your reply is very useful for me.

    Regards

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

    Hie Sujesh,

    just to addon. Like what Alex mentioned, it's not very common to use 1.2V LVCMOS I/O standard for DDR-related applications, =)

    However Quartus does not set restrictions based on the "common applications" of the I/O standards.

    Since you are new, i recommend you to checkout the Altera web which has a tonne of documentation on many topics that would be helpful to you.

    e.g.:

    https://www.altera.com/en_us/pdfs/literature/an/an348.pdf

    this should be a good guide for you on DDR-related applications, =)

    thanks, have a nice day!