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Altera_Forum's avatar
Altera_Forum
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20 years ago

SDRAM Pin Assignment issue

http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif Issue Resolved, used the first option from those mentioned below by freezy, thanks freezy http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif

Hi

I am using the Altera 1s10 (Stratix) NDK

I am using the full_featured reference design as my base and have added an remote_update megafunction.

I now have an pin assignment conflict for 3 pins of the sdram address bus.

zs_addr_from_the_sdram[1] PIN_W12

zs_addr_from_the_sdram[3] PIN_W10

zs_addr_from_the_sdram[4] PIN_AA11

these pins conflict with the dedicated remote update pins , so i have to move these 3 address pins to other IO pins.

but

i cannot move to a general purpose IO pin since such a pin would not be wired to the SDRAM in the NDK

i tried putting in 3 general purpoese IO pins but i get a verify failed when i download the code.

could you please suggest a solution

regards

pavan

1 Reply

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

    Hi ppk031000,

    Perhaps it&#39;s resulted from the conflicting of external tri-state bus between

    2 memory devices on your board. Because I haven&#39;t used the board you mentioned,

    so it&#39;s just my speculation.I may give you two suggestions:

    1)Perhaps it&#39;s because of your carelessness when you created your system,

    so reopen SOPCBuilder and the SDRAM component wizard.Now check

    the selection for "Share pins for via Tri-state Bridge" is checked or not,

    you should *check it* to avoid the bus-sharing result of SDRAM.

    2)If the 1) cannot resolve your problem,Go to download or write

    by yourself a MUX module for your conflicted pins http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/wink.gif

    Regards,

    Don