The storage principle of u disk and the function of U disk installation system

The storage principle of u disk and the function of U disk installation system

We all know that u disk is a USB interface to the mainframe computer, U disk data can be exchanged with the computer and storage of information equipment. But there are also many friends who do not know that U disk can also be made into a U-tray system function.

The computer turns the binary digital signal into the compound binary digital signal (joins the assignment, the check, the stack and so on) reads and writes to the USB chip adapter interface, through the chip processing signal assigns to the EEPROM memory chip the corresponding address storage binary data, realizes the data storage. EEPROM data memory, its control principle is the voltage control gate transistor voltage high-low value, the gate transistor's knot capacitance may hold the voltage value for a long time, after the power loss can save the data the reason mainly is adds the floating gate and the choice Gate in the original transistor. A floating shed for storing electrons is formed in a semiconductor on which the current is unidirectional conduction between the source and drain poles. The floating gate is covered with a layer of silicon oxide film insulator. The top of it is the selection/control grid that controls the conduction current between the source and drain poles. The data is 0 or 1 depending on whether there is an electron in the floating gate formed on the silicon floor. There are electrons for 0, no electrons for 1. Flash memory is the same as its name, delete data before writing to initialize. Specifically, the electrons are derived from all the floating grids. Data will be returned to "1". Writes only when the data is 0 o'clock and does nothing when the data is 1. When written 0 o'clock, a high voltage is applied to the gate electrode and the drain, increasing the electrical energy transmitted between the source and drain poles. As a result, electrons break through the oxide film insulator and enter the floating grille. When the data is read, a certain voltage is applied to the gate electrode, the current is 1, and the current is set at 0. When a floating gate has no electronic state (data is 1), the voltage is applied to the drain electrode when the voltage is applied to the gate electrodes, and the current is generated between the source and drain poles due to the movement of a large number of electrons. In the case of a floating gate having an electronic state (data 0), the electrons in the channel are reduced. Because the voltage applied to the gate electrode is absorbed by the floating gate, it is difficult to influence the channel.

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