Role of DRAM
DRAM also called Dynamic Random Access Memory is a type of random access memory that stores each bit of data in a separate capacitor within an integrated circuit. Since real capacitors leak charge, the information eventually fades unless the capacitor charge is refreshed periodically. Because of this refreshment requirement, it is dynamic memory as opposed to SRAM and other static memory.
The advantage of DRAM is its structural simplicity which has only one transistor and a capacitor are required per bit, compared to four transistors in SRAM. This allows DRAM to reach very high density. Unlike flash memory, it is volatile memory, since it loses its data when the power supply is removed. The operation principle in DRAM is very quite easy to understand. DRAM is usually arranged in a square array of one capacitor and transistor per cell.
Modern DRAM is constructed with thousands of cell in length/width. The word line is referred to as long lines connecting each row. Each column is composed of two bit lines, each one connected to every other storage cell in the column. Under some conditions, most of the DRAM can be recovered even if the DRAM has not been refreshed for several minutes. There are so many variations in DRAM. They are quite complicated to understand having the basics of DRAM. DRAM has become popular in less time than compared to SRAM. DRAM is cheaper than SRAM which are sold in large numbers.
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