What are the different types of DRAM?
• FPM (Fast Page Mode) DRAM Asynchronous DRAM. DRAM with high-speed access function called fast page mode. • EDO (Extended Data Out) DRAM Asynchronous DRAM. DRAM with high-speed access function called EDO. (DRAM designed for higher access speed during read, by extending the data output timing through the fast page mode) • Synchronous DRAM (SDRAM) Clock-synchronous DRAM. Memory operation is controlled through commands. There are the following 3 types of SDRAM, which differ in their power supply voltage, pre-fetch operation, etc. SDR DDR DDR2 External clock 66 to 133MHz 100 to 200MHz 200 to 400MHz Data transfer speed 66 to 133Mbps 200 to 400Mbps 400 to 800Mbps Power supply voltage 3.3V 2.5V 1.8V Prefetch 1 2 4 Burst length 1, 2, 4, 8, full page 2, 4, 8 4, 8 Package TSOP TSOP BGA • RDRAM (Rambus DRAM) High-speed DRAM that uses the Rambus high-speed interface technology developed by Rambus, Inc. (US). The reduction in the number of signal lines enables high-speed operation. The data transf
