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Which is better NOR Flash or NAND flash?
The NOR Flash architecture provides enough address lines to map the entire memory range. This gives the advantage of random access and short read times, which makes it ideal for code execution. NAND Flash, in contrast, has a much smaller cell size and much higher write and erase speeds compared to NOR Flash.
What is flash memory used for in microcontroller?
Flash memory is a long-life and non-volatile storage chip that is widely used in embedded systems. It can keep stored data and information even when the power is off. It can be electrically erased and reprogrammed. Flash memory was developed from EEPROM (electronically erasable programmable read-only memory).
What is NAND flash used in?
NAND flash has found a market in devices to which large files are frequently uploaded and replaced. MP3 players, digital cameras and USB flash drives use NAND technology. NAND flash saves data as blocks and relies on electric circuits to store data.
Where are NAND and NOR flash memory used?
NAND and NOR flash memories are used both externally and integrated with MCUs onto System-on-Chips (SoCs) and memory usage trends are evolving around other changes in technology. Both NOR and NAND flash have a place in embedded systems, however. Skip this section if you are familiar with MCUs and memory.
How are NAND flash cells similar to NOR flash cells?
In NAND Flash, several memory cells (typically eight cells) are connected in series similar to a NAND gate (see Figure 1). Figure 1: NOR Flash (left) has an architecture resembling a NOR gate. Similarly, NAND Flash (right) resembles a NAND gate.
What kind of bus does NAND flash use?
In NAND Flash, memory is accessed using a multiplexed address and data bus. Typical NAND Flash memories use an 8-bit or 16-bit multiplexed address/data bus with additional signals such as Chip Enable, Write Enable, Read Enable, Address Latch Enable, Command Latch Enable, and Ready/Busy.
What kind of memory is used in a microcontroller?
(I know that some use FRAM, but I asking only about FLASH memory technology) Undoubtly, for program memory, the memory of choice is NOR Flash.