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SDRAM Pin Assignment issue

Altera_Forum
Honored Contributor II
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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
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Altera_Forum
Honored Contributor II
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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
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