nios cpu control the ram on chip

hi !

as I kown, there are two ways for nios cpu to control the ram on chip .the firs way is to write the data and the address to ram by PIO ,the second ways is to make myself commponet to control the ram. however, I don't kown ,how shuld I driver the input clock of the ram? can I make the nios cpu clock as the ram clock?

thanks for your kind reply.