Three-state buffer, also known as three-state gate, three-state driver, its three-state output is controlled by the enable output. When the enable output is valid, the device implements the normal logic state output (logic 0, Logic 1), when the enable input is inactive, the output is in a high-impedance state, which is equivalent to disconnection from the connected circuit. The read/write control circuit receives relevant control signals from the CPU to control the input/output of the data. The tri-state data buffer is the data input/output channel. The direction of data transmission depends on the control logic's control of the three-state gate. The control signals sent by the CPU to the memory chip mainly include a read/write signal (R/W), a chip select signal (CS), and the like. It is worth noting that the semiconductor circuit chips of different natures also have different peripheral circuit parts, such as control circuits for pre-charge and refresh in the dynamic RAM, and only output control for the ROM chip under normal working conditions. Logic, etc.
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