DDR2 is the new generation of Double Data Rate memory technology, which follows a standard defined by JEDEC (Joint Electron Device Engineering Council), and it will quickly replace the commonplace DDR.
The new memory modules built on this technology include many new and advantageous features; such as greater speeds, lower latencies, a larger 4-bit prefetch and programmable on-die termination (ODT) to reduce signal bounce and improve reliability at high speeds.
Major Differences Between DDR and DDR2 are:
Prefetch length: DDR2 implements a 4-bit prefetch instead of the 2-bit prefetch of the original DDR standard.
Package type: DDR2 utilizes a FBGA (Find Ball Grid Array) while DDR uses a TSOP-II (Thin Small-Outline Package). The FBGA uses a find pitch ball arrangement on the underside of the package, whereas the TSOP has leads protruding from the sides of the package. As the FBGA contact point is on the bottom of the package, the package can be made smaller than the TSOP.
Operating Speeds: DDR2 operating frequencies begin where the original DDR frequencies end.
By Pierre Fazan, Innovative Silicon, Inc. There is only one way for Moore’s Law to proceed at its current pace in the memory world and that is for memories to be built on Silicon on Insulator (SOI). While some people claim that SOI cannot become a mainstream process technology, it is a must for technology innovation to continue at a rapid rate. This is because, SOI accommodates the...