What kind of memory is eeprom?

EEPROM (Electrically Erasable Programmable read only memory) refers to electrically erasable programmable read-only memory. is a memory chip that does not lose data after power failure.

EEPROM can erase existing information and reprogram it on a computer or special equipment. Generally used in plug and play. (Recommended learning: PHP video tutorial)

EEPROM (Electrically Erasable Programmable Read-Only Memory) is a user-changeable read-only memory (ROM) that can be changed through high Erase and reprogram (rewrite) with normal voltage.

Unlike EPROM chips, EEPROM can be modified without removing it from the computer. In an EEPROM, programming can occur frequently while the computer is in use, so EEPROM life is an important design consideration.

EEPROM is a special form of flash memory that is erased and reprogrammed using voltages typically found in personal computers.

Features

EEPROM is generally used for Plug & Play.

Commonly used in interface cards to store hardware setting data.

is also commonly used in "hardware locks" to prevent illegal copying of software.

Basic Principle

Due to the inconvenience of EPROM operation, most of the BIOS ROM chips on later motherboards use EEPROM (Electrically Erasable Programmable ROM, electrically erasable and programmable ROM). programming ROM).

Erasure of EEPROM does not require the help of other devices. It uses electronic signals to modify its content, and uses Byte as the minimum modification unit. It is not necessary to wash out all the data before writing, completely getting rid of the problem. EPROM Eraser and programmer tethering.

EEPROM still needs to use a certain programming voltage when writing data. At this time, the content can be easily rewritten using a special refresh program provided by the manufacturer. Therefore, it is a dual-voltage chip.

With the help of the dual-voltage characteristics of the EEPROM chip, the BIOS can have good anti-virus functions. When upgrading, turn the jumper switch to the "on" position, that is, add the corresponding programming voltage to the chip. It can be easily upgraded; during normal use, turn the jumper switch to the "off" position to prevent CIH viruses from illegally modifying the BIOS chip. Therefore, there are still many motherboards that use EEPROM as the BIOS chip and as a major feature of their motherboards.

For more PHP related technical articles, please visit the PHP Graphic Tutorial column to learn!

The above is the detailed content of What kind of memory is eeprom?. For more information, please follow other related articles on the PHP Chinese website!