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Understanding DRAM Operation

Applications NoteUnderstanding DRAM Operation12/96 Page 1 OverviewDynamic random access memory (DRAM) devicesare used in a wide range of electronics they are produced in many sizes and soldin a variety of packages, their overall Operation isessentially the are designed for the sole purpose of storingdata. The only valid operations on a memory deviceare reading the data stored in the device, writing (orstoring) data in the device, and refreshing the dataperiodically. To improve efficiency and speed, anumber of methods for reading and writing the mem-ory have been document describes basic asynchronousDRAM Operation , including some of the most com-monly used features for improving DRAM perfor-mance. While many aspects of a synchronousDRAM are similar to an asynchronous DRAM, syn-chronous Operation differs because it uses a clockedinterface and multiple bank architecture. Additionalinformation regarding specific features and designissues may be found in the Applications ArchitectureDRAM chips are large, rectangular arrays of mem-ory cells with support logic that is used for readingand writing data in the arrays, and refresh circuitry tomaintain the integrity of stored ArraysMemory arrays are arranged in rows and columns ofmemory cells called wordlines and bitlines, respec-tively.

Understanding DRAM Operation 12/96 Page 1 Overview Dynamic Random Access Memory (DRAM) devices are used in a wide range of electronics applications. Although they are produced in many sizes and sold in a variety of packages, their overall operation is essentially the same. DRAMs are designed for the sole purpose of storing data.

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