5/26/2023 0 Comments Sd Life Monitor Tool![]() Information that has not been changed must still be programmed in again.įlash memories have a limited lifetime due to programming and erasing, which is given in erase cycles ![]() Erasing (for a logical “0”) can only be done blockwise. Writing (for a logical “1”) can be done bitwise or at least byte / wordwise. A page has between 5 bytes, a block can contain up to 256 pages (thus a total of 2048 kB with 8kB page size). NAND flash components used in microSD cards group the individual memory transistors into pages, and several of the pages into blocks. For this purpose, additionally the control gate (V1/V2/V3) is used.įor erasing, the electrons are driven out of the floating gate again by applying a high negative voltage via the control gate. ![]() 10 V) are used than for the normal read operation (e.g. The transistor then blocks at a normal read voltage (does not conduct).įor programming the floating gate, significantly higher electrical voltages (e.g. the threshold voltage of the transistor, starting from which current would flow. Electrons introduced into the floating gate increase e.g. The information is always read between source (S) and drain (D).
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