can anybody tell how autorefresh in SDRAM exactly works? suppose in SDRAM specifications it is mentioned that 64 ms, 4096 cycle refresh(15.6 us/row) what exactly it means and how we need to generate the autorefresh cycles.
actually i am trying to upgrade the 512k*4*32 SDRAM(Fujitsu Make) to Micron Make 1M*4*32 SDRAM.
FUJITSU specifies that 4K refresh cycles every 16ms, auto refresh (3.9 us) and micron specifies that 64 ms, 4096 cycle refresh(15.6 us/row).
Did any body tried to do this kind of upgradation. we have the CPLD which controls the Fujitsu SDRAM and other interfaces.now we want to upgrade the SDRAM as i mentioned above.
Anybody can help in this regard please reply to email@example.com .i can send u the data sheets of both the SDRAMs,if you want.
thanks and regards,