CPU 32bit and an 16 bit SDRAM and an 16 bit FLASH( update)

We have a question to ask,hope someone help us how to do we use NS7520 32 bit,and use a 4M FLASH 16 bit,and an 8M SDRAM 16 bit. we got bootcode,and run ucLinux,seem to be 32 bit arm mode ,on hardware design, how to wrok on 32 bit when we use a 4M flash 16 bit,and an 8M SDRAM 16bit on our development board,its address bus might be from A2~Ax,or A1~Ax ?and A23~A24,it seem to be b(11) (pullup)or not?have any superman, can tell us how to do,tell us the detail,thanks