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Altera_Forum's avatar
Altera_Forum
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14 years ago

uncontrolled SDRAM content change

Hi, I use a code which checks external SDRAM () by writing 0xAAAA and 0x5555 patterns. But the code always return an error code! When I check step by step SDRAM content with NIOSII IDE I can ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

This may sound stupid but are you sure you are using the correct base address? Be careful if you have a bridge that shifts the address range.

With SignalTap you can also check the signals on the Avalon side of the controller and see exactly what is done, and if it corresponds to what you do in the software or if there are other accesses.