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Altera_Forum's avatar
Altera_Forum
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11 years ago

cyclone ii and ddr sdram interfacing

hi,

i am using cyclone ii ep2c50 484 pin package, i am interfacing ddr sdram to fpga.

here for data fpga has dedicated pins but for address and controls it doesn't have any dedicated pins.

can u suggest me how to connect these address and controls of ddr sdram to fpga or can i connect to any pin, please help me.

ddr sdram requires any termination resistors for data, control and address, if so what resistors i have to use.

thanks

1 Reply

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

    I strongly recommend you look through the following document: external memory interface handbook volume 5 - section i. altmemphy design tutorials (http://www.altera.co.uk/literature/hb/external-memory/emi_tut_ddr.pdf).

    This discusses in great depth connecting DDR memory to FPGAs.

    Yes, there are dedicated pins for the data. Pin selection for the control bus (address, cs, wr etc.) is a little more flexible.

    I recommend you put a design together and let the tools give you a pinout. You can either use this as is or make changes, each time confirming, with Quartus, that the pin changes you're making can be supported.

    Regards,

    Alex