Department of Computer Scien

ce and Information Engineering

National Cheng Kung University

HANEL

SEMI-

CONDUCTOR MEMORY

RAM

DRAM (Dynamic

RAM)

‰Dynamic RAM uses a capacitor to store each bit

¾It cuts down the number of transistors needed to build the cell¾It requires constant refreshing due to leakage

‰The advantages and disadvantages of DRAM memory

¾The major advantages are high density (capacity), cheaper cost per bit, and lower power consumption per bit¾The disadvantages is that

ƒit must be refreshed periodically, due to the fact that the capacitor cell loses its charge; ƒWhile it is being refres

hed, the data cannot be

accessed