How do I get 18 addresses out of a 12 address SDRAM?

Question

Hi. I wanted to know how I can get more address space out of the SDRAM in my Altera DE1.

for example: At the moment, I have SRAM wired up to a games console in which I use to load the games off of. I want to use SDRAM because I need 2 Megabytes for some ROM's, where as the RAM I am using at the moment (SRAM) can only hold up to 512 KB. The problem with doing this, is I found out the SDRAM does not have as many address pins as the SRAM does.

How can I go around solving this exactly?

Thanks for your help.

altera_forum · Answer

Take a look to any sdram datasheet: sdram are organized in rows, columns and possibly banks; those few address lines actually multiplex row and column addresses which eventually build the real logical address of the memory cell to be accessed.

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How do I get 18 addresses out of a 12 address SDRAM?

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