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I have an Ep2C35
De2 User Manual
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You are refering to off-chip memory. The "memory compiler" in the MegaWizard is for on-chip memory. This means the memory blocks that are in your Cyclone II Fpga. You are refering to the off-chip SRAM module on your DE2 board.
You can directly address your SRAM from your FPGA (but not via the MegaWizard), or you can add this SRAM very easily in the SOPC Builder. The university program ip cores (
http://www.altera.com/education/univ/materials/ip-cores/unv-ip-cores.html) already provide prepared interfaces of the SRAM on the DE2 board in the Avalon fabric.