Fast Cycle DRAM

Fast Cycle DRAM (FCRAM) is a type of synchronous dynamic random-access memory developed by Fujitsu and Toshiba. FCRAM has a shorter data access latency compared to contemporary commodity SDRAMs; and is used in where the lower data access latency is more desirable than low cost and high capacity (FCRAM is a moderate cost and capacity speciality DRAM). FCRAM achieves its low latency by dividing each row into multiple sub-rows, only which one is activated during a row-activation operation. This had the effect of reducing the effective array size, improving the access time. FCRAM has a DDR SDRAM-like command set to enable memory controllers that support both DDR SDRAM and FCRAM. It also has a standard dual in-line memory module (DIMM).

References

Jacob, Bruce et al. (2008). Memory Systems: Cache, DRAM, Disk. Morgan Kauffmann Publishers. pp. 494–495.

Dynamic random-access memory (DRAM)

Asynchronous	FPM RAM EDO RAM

Synchronous	SDRAM Fast Cycle DRAM (FCRAM) RLDRAM DDR SDRAM Mobile DDR (LPDDR) DDR2 SDRAM DDR3 SDRAM DDR4 SDRAM

Graphics	VRAM WRAM MDRAM SGRAM GDDR2 GDDR3 GDDR4 GDDR5

Rambus	RDRAM XDR DRAM XDR2 DRAM

Memory modules	SIMM DIMM SO-DIMM UniDIMM

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