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| learn:fundamentals:circuits:memory-circuits:start [2016/07/22 19:22] – created Martha | learn:fundamentals:circuits:memory-circuits:start [2022/10/04 11:38] (current) – external edit 127.0.0.1 | ||
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| - | ====== | + | ====== Memory Circuits ====== |
| Memory circuits function by storing the voltage present on an input signal whenever they are triggered by a control signal. They retain that stored voltage until the next assertion of the control (or trigger) signal. Between assertions of the control signal, the input signal is ignored and the output is driven to the most recently stored voltage. A memory circuit stores the input signal level at each assertion of the control input, the output will change immediately after the control signal is asserted (if the input value is opposite to what is stored), or it will remain constant. “Memory” occurs between control signal assertions, because the output remains constant at the last stored value, regardless of input signal changes. | Memory circuits function by storing the voltage present on an input signal whenever they are triggered by a control signal. They retain that stored voltage until the next assertion of the control (or trigger) signal. Between assertions of the control signal, the input signal is ignored and the output is driven to the most recently stored voltage. A memory circuit stores the input signal level at each assertion of the control input, the output will change immediately after the control signal is asserted (if the input value is opposite to what is stored), or it will remain constant. “Memory” occurs between control signal assertions, because the output remains constant at the last stored value, regardless of input signal changes. | ||
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| * During the transition between states, the output signal must move through a region where it is astable. Memory circuits are designed so that they cannot stay in the astable state indefinitely—once they enter the astable state, they immediately attempt to regain one of the two stable states. | * During the transition between states, the output signal must move through a region where it is astable. Memory circuits are designed so that they cannot stay in the astable state indefinitely—once they enter the astable state, they immediately attempt to regain one of the two stable states. | ||
| * Any logic circuit can have feedback if an output signal is simply “fed back” and connected to an input. | * Any logic circuit can have feedback if an output signal is simply “fed back” and connected to an input. | ||
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