For any system, the speed grade ranges from low to high are, Disk devices with search time in mS, Flash device read/write in uS, DRAM in 50 nS, and SRAM in near ns, 16 Mb of ×16 configuration, i.e. 1M×16, in 2 5 nS. It is always critical to provide options to {HEAD ~ a system designer} with {TAIL ~ the basic memory cell} and organizations of various high speed, low area, and low power to fit ones system unit application 
For any system , the speed grade ranges from low to high are , Disk devices with search time in mS , Flash device read / write in uS , DRAM in 50 nS , and SRAM in near ns , 16 Mb of ×16 configuration , i.e. 1M×16 , in 2 5 nS. It is always critical to provide options to { HEAD ~ a system designer } with { TAIL ~ the basic memory cell } and organizations of various high speed , low area , and low power to fit ones system unit application
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