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• Memory_refresh abstract "Memory refresh is the process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information. Memory refresh is required in semiconductor dynamic random access memory (DRAM), the most widely used type of computer memory, and in fact is the defining characteristic of this class of memory. In a DRAM chip, each bit of memory data is stored as the presence or absence of an electric charge on a small capacitor on the chip. As time passes, the charges in the memory cells leak away, because even in a "nonconducting" state, a transistor will conduct a small amount, so without being refreshed the stored data would eventually be lost. To prevent this, external circuitry periodically reads each cell and rewrites it, restoring the charge on the capacitor to its original level. Each memory refresh cycle refreshes a succeeding area of memory cells, thus repeatedly refreshing all the cells in a consecutive cycle. This process is conducted automatically, in the background, by the memory circuitry, while the computer is on, and is transparent to the user. While a refresh cycle is occurring the memory is not available for normal read and write operations, but in modern memory this "overhead" time is not large enough to significantly slow down memory operation.Computer memory that does not require refreshing is available, called static random access memory (SRAM). SRAM circuits take up more room on the semiconductor chip, because each SRAM memory cell requires 4 - 6 transistors, compared to a single transistor and a capacitor for DRAM. For this reason the storage capacity of SRAM chips is much less than DRAM, so SRAM memory is more costly per bit. Therefore DRAM is used for the main memory in computers, video games, and most other large uses of semiconductor memory. The need for extra circuitry to perform memory refresh makes DRAM circuits and their timing significantly more complicated than SRAM circuits, but the great advantages of DRAM in density and cost justify this complexity.".
• Memory_refresh wikiPageID "3152733".
• Memory_refresh wikiPageRevisionID "602713449".
• Memory_refresh hasPhotoCollection Memory_refresh.
• Memory_refresh subject Category:Computer_memory.
• Memory_refresh comment "Memory refresh is the process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information. Memory refresh is required in semiconductor dynamic random access memory (DRAM), the most widely used type of computer memory, and in fact is the defining characteristic of this class of memory.".
• Memory_refresh label "Memory refresh".
• Memory_refresh label "Rafraîchissement de la mémoire".
• Memory_refresh label "Refrescamiento de memoria".
• Memory_refresh sameAs Refrescamiento_de_memoria.
• Memory_refresh sameAs Rafraîchissement_de_la_mémoire.
• Memory_refresh sameAs m.08vvkj.
• Memory_refresh sameAs Q6815755.
• Memory_refresh sameAs Q6815755.
• Memory_refresh wasDerivedFrom Memory_refresh?oldid=602713449.
• Memory_refresh isPrimaryTopicOf Memory_refresh.