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How can DRAM be used as a computer memory if values quickly become zero?The answer lies in a simple technique: devise a way to read a bit out of memory beforethe charge has time to dissipate, and then write the same value back again. Writing avalue causes the capacitor to start again with a full charge. So, reading and then writinga bit will reset the capacitor without changing the value of the bit.In practice, computers that use DRAM contain an extra hardware circuit, known asa refresh circuit, that performs the task of reading and then writing a bit. Figure 10.2illustrates the concept.
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