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Markus, I would advise to write your own Avalon master controller instead, and put it along with the SDRAM controller in your SOPC system. SOPC builder will automatically add some arbitration logic, and this solution would be easier to write, test, maintain, and re-use.
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Just curious, what does the Avalon Master Controller connected to the SDRAM controller get you? Is it easier to interface to the Avalon Master Controller from the outside (user logic) than it is to connect to the avalon bus / SDRAM controller without it?
http://www.alteraforum.com/forum/showthread.php?t=3468 http://www.altera.com/support/examples/nios2/exm-avalon-mm.html http://www.alteraforum.com/forum/showthread.php?t=19053 http://www.alteraforum.com/forum/showthread.php?t=12689
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