How Flash Memory Works?

Written by IT News on 7:02 AM

Flash memory are solid state electronic devices with random access memory capabilities, used for fast digital information on storage. They are used in a wide range of applications such as storage of BIOS living in a typical digital computers, as the winner of the capacity of hard drives for digital cameras and memory cards for laptop computers and video consoles.

The technology used to produce flash service is based on EEPROM (electrically programmable with erasable read-only memory) chips, which comprise the memory banks set up in storage boxes made in the network of columns and rows. A basic cell has two baggage MOS-transistors to each intersection, and are separated by one layer of oxide. The two transistors are known as floating gate and control gate.

When the floating gate is tied to the line of cellular stores edin'1 "bit logic. The value promeni'0" logic through a process known as the Fowler-Nordheim tunneling, which changes the distribution of electrons inside the floating gate. When the charge relates to floating gate of the column, it passes through the transistor, then sewage system land in which the formation of a negative charge is created by the other side of the oxide layer.

After Electric charge forms, no other electrons can penetrate the layer and on the other side due to electrostatic forces, thus establishing a distribution slightly higher fee of 50% between the floating gate and control gate, which records kato'1 "logic. However, when the fee allocation between the two transistors falls below 50%, then the cell is evaluated as baggage edin'0" bit logic.

To delete flash memory and return to electronic distribution inside it, a high-voltage charge is used to generate electric fields that study of all cells na'1 "logic. This can be done in certain blocks of memory or the whole chip. Flash services may retain the information only on condition that they have power, however, flash RAM can maintain the information stored without requiring any additional sources of energy.

There are several types of flash service, each with different characteristics in terms of size and storage capacity, but they all shares roughly the same properties. They are solid state devices, thus, which have no moving parts to keep them quiet, have quick access speeds and are relatively small in size. They consume low amounts of power while in use and can provide storage capacity ranging between a few kilobytes of several tens of gigabytes.