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Altera_Forum
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20 years ago

Problem using SDRAM

Hello, I have problem using SDRAM on my custom board. My program won't run when I map program memory(.text) to SDRAM. I have no trouble reading/writing SDRAM from my program if .text...
Altera_Forum's avatar
Altera_Forum
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20 years ago

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originally posted by fuji@Oct 20 2005, 06:40 AM

i had to choose "controller shares dq/dqm/addr i/o pins"

because my hardware shares data/address bus with external flash.

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Usually, folks give the SDRAM its own bus so other things won't slow it down.

That said, I think there's a section in the SDRAM controller manual that says what you have to do to make the shared pins work, besides checking that box. SOunds to me like the SDRAM and Flash are conflicting with each other, being selected at the same time, or something. If it were happening to me, I'd have to hook up SignalTap or a logic analyzer to see what was happening. Sorry I'm not more help.