What Is Volatile Memory?

The full name of RAM (Random Access Memory) is random access memory, which is equivalent to mobile storage on a PC, used to store and save data.

Volatile memory

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Full name of Random Access Memory (RAM)

It can be read and written at any time. RAM is usually used as a temporary storage medium for the operating system or other running programs.

Different applications in different

In the application board test phase, to properly stimulate

The advantage of SPI flash is that the number of pins is small and fixed (8 or 16). This feature of serial flash memory simplifies board layout and upgrades firmware without changing hardware, which can reduce the overall cost of system development.

Due to the strong advantages in terms of simplicity and cost, the trend of parallel port flash memory to SPI flash memory has appeared in the PC and consumer electronics markets. As long as performance requirements are met, device manufacturers will prefer serial flash. Computer optical drives, automotive electronics, Bluetooth modules, set-top boxes, and modem markets are introducing such SPI flash memory that can read code directly into non-volatile memory.

XiP (On-Chip Execution) applications require serial memory to provide a "random access memory" simulation function, that is, to access memory contents without sending instructions, and to allow access to memory with maximum throughput. Because the traditional purpose is to store and download code, SPI memory is a synchronous device. The XIP function forces designers to develop flexible memories that can flexibly configure serial flash memory based on chipset characteristics. For example, after the system is powered on, XIP-capable devices need the JEDEC protocol based on commands, addresses, and data, so some logic devices are not allowed to manage serial flash memory like XIP devices.

In addition, some logic devices support XIP mode only on one line or at most two lines. Due to inherent hardware limitations, it is impossible to turn on the 4-bit I / O input / output mode.

Finally, because it is difficult to design a mixed protocol, traditional memory that accepts commands, and nonvolatile memory that does not accept commands, chipset manufacturers are more willing to retain the original SPI instruction structure, ie, commands, addresses, and data. In these cases, high-speed protocols combining parallelized commands, addresses, and data are more popular in the market.