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=== Operation === | === Operation === | ||
Static RAMs use basic memory cells with built-in feedback mechanisms that retain the stored value for as long as the device is powered. A basic example of a feedback mechanism is a pair of [[inverters]] that are cross-coupled such that the output of one [[inverter]] becomes the input of the other inverter. As long as there is power, the stored value will be continuously reinforced by the positive feedback loop which also helps correct for leakage and noise. | Static RAMs use basic memory cells with built-in feedback mechanisms that retain the stored value for as long as the device is powered. A basic example of a feedback mechanism is a pair of [[inverters]] that are cross-coupled such that the output of one [[inverter]] becomes the input of the other inverter. As long as there is power, the stored value will be continuously reinforced by the positive feedback loop which also helps correct for leakage and noise. | ||
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Writing a new [[bit]] value involves driving the desired value and its complement onto the input and output of the cross-coupled inverters. By driving a stronger new value and overpowering the older values, a new bit value may be stored in the cell. | Writing a new [[bit]] value involves driving the desired value and its complement onto the input and output of the cross-coupled inverters. By driving a stronger new value and overpowering the older values, a new bit value may be stored in the cell. | ||
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Reading the stored value involves reading the output of the cell. Note that in practice, due to the size of the transistors involved which makes them very weak, driving the output directly from the bitcell is very challenging. Instead, a [[sense amplifier]] is used to generate a strong output from the attenuated bit value. This is explained in more detail later in this article. | Reading the stored value involves reading the output of the cell. Note that in practice, due to the size of the transistors involved which makes them very weak, driving the output directly from the bitcell is very challenging. Instead, a [[sense amplifier]] is used to generate a strong output from the attenuated bit value. This is explained in more detail later in this article. |