CSCI E-93: Application Note 6

How to build a Quartus project that uses the memory subsystem
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Follow the notes in the "documentation for the memory subsystem" on
the class web site.  This is available at MemorySubsystemSummary
20141118.pdf.  That document contains code that should be the
top-level entity in any project that uses the memory subsystem.  The
memory subsystem itself (which is different and specific to the DE2-70
and to the DE2-115) should be copied into your project in a
sub-directory named cscie93.  It is also available on the class web
site.

All ports declared in the top-level entity's port section should
appear there because of a connection to a hardware pin.  No ports
should be declared in the top-level entity if they are not assigned to
hardware pins.