[edit]Storage Principle
The computer converts the binary digital signal into a composite binary digital signal (joining the allocation, checking, stacking and other commands) read and write to the USB chip adapter interface, through the chip processing signals are assigned to the corresponding address of the EEPROM memory chip to store the binary data to achieve the storage of the data. eeprom data memory, its The control principle is the voltage control gate transistor voltage high and low values, gate transistor junction capacitance can be long time to save the voltage value, the power failure can save the data is mainly because of the original transistor to join the floating gate and select the gate. A floating shed for storing electrons is formed on the semiconductor that conducts current unidirectionally between the source and the drain. The floating gate is wrapped with a silicon oxide film insulator. Above it is the selector/control gate that controls the conduction current between the source and drain. The data is 0 or 1 depending on the presence or absence of electrons in the floating gate formed on the silicon substrate. The presence of electrons is a 0 and the absence of electrons is a 1. Flash memory, as its name implies, is initialized by deleting data before writing. Specifically, the electrons are exported from all the floating gates. This means that all data will be returned to "1". When writing, only when the data is 0 is written, and when the data is 1, nothing is done. When writing 0, a high voltage is applied to the gate electrode and drain to increase the energy of the electrons conducting between the source and drain. This causes the electrons to break through the oxide film insulator and enter the floating gate. When reading data, a certain voltage is applied to the gate electrode, and a large current is 1, while a small current is set to 0. In the state where the floating gate does not have electrons (data is 1), applying a voltage to the drain electrode when the gate electrode applies a voltage to the state, a current is generated between the source and drain electrodes due to the movement of a large number of electrons. In contrast, in the state where the floating gate has electrons (data of 0), fewer electrons are conducted in the channel. This is because the voltage applied to the gate electrode is absorbed by the floating gate electrons, making it difficult to have an effect on the channel.
Also known as T-Flash card, full name: TransFLash, developed by Motorola and SANDISK*** and launched in 2004. It is an ultra-small card (11*15*1MM), about 1/4 of the SD card, and can be considered the smallest memory card at present.TF card can be used as SD card after SD card converter. The adapter can be used in devices that use SD as a storage medium.TransFlash is mainly developed for camera phones to capture large images and to be able to download larger video clips.TransFlash cards can be used to store personal data such as digital photos, MP3s, games, and applications for cell phones and personal data, and have a built-in copyright protection and management system to allow downloads of music, images, and video clips to be stored on the card. It also has a built-in copyright protection system to protect downloaded music, videos and games, and future versions of TransFlash will include encryption to protect personal data, financial records and healthcare documents. The compact size of TransFlash allows manufacturers to adopt this design without worrying about the size of the phone, and another flexible application is to allow suppliers to make substitutions at any time prior to delivery according to the different needs of the customer, which is an advantage not available with embedded flash memory.
Details:
◆ The size of a SIM card is about half a SIM card, and it has a built-in copy protection management system that is suitable for a wide range of multimedia applications.
◆With an adapter, it can be used in digital products with an SD card slot.
◆Size: 11mm*15mm*1mm
The cell phone itself has a certain memory capacity, in order to meet the personalized demand for cell phone memory, many modern cell phone brands and models have set up an external memory, which is what we usually call the cell phone memory card. Cell phone memory cards can be used to store songs, movies, e-books, game software and other data and information. Generally speaking, there are many kinds of cards used in cell phones, and the cards used in different cell phones with different performance are also different. For example: MMC cell phone memory card, SD cell phone memory card, TF cell phone memory card, M2 cell phone memory card, Mini SD, MS, Sony Memory Stick, etc. More common