1. The two ancestors of the storage world: RAM & ROM {Note: The level of performance is based on the premise of other specifications In the case of the same, comparatively speaking! }
RAM: Volatile random high-speed, high-priced storage (loss of power, read and write)
ROM: Non-volatile non-random low-speed low-cost storage (drop Power is not lost, read-only)
2. The two sons of Master RAM: Asura (SRAM), Indra (DRAM)
span>{Note: The said performance level is compared in the case of the same size premise of other specifications! }
1. Asura (SRAM): [Father Features+] Static high price, high performance and low integration, often used as a cache between CPU and memory (without refreshing)
2. Indra (DRAM): [Father Features+] Dynamic, low-cost, low-performance, high-integration commonly used as computer memory (periodical refresh)
3. The four descendants of ROM Patriarch: ROM (mask ROM), PROM (one-time programmable), EPROM (UV erasable rewritable ROM), EEPROM (electrically erasable rewritable ROM)< /p>
The first generation of Naruto: ROM (mask ROM)
The second generation of Naruto: PROM (one-time programmable)
The third generation of Naruto: EPROM( Ultraviolet erasing can rewrite ROM)
The fourth generation of Naruto: EEPROM (electrical erasing can rewrite ROM)
four, two The descendants of the ancestors have their own advantages and disadvantages, but the strengths and weaknesses of the offspring of the two ancestors can complement each other, so the offspring of the two ancestors are married to produce a powerful generation-the seventh generation of Hokage: FLASH (Flash )
5. Excellent hybrid: FLASH
combines the advantages of ROM and RAM, Become:
The seventh generation of Naruto: Non-volatile random high-speed low-cost storage is common such as U disk, hard disk, etc.
Two seventh-generation Naruto:
1. Bright place—Naruto: NOR FLASH->Non-volatile reading is fast and writing is slow. It has XIP performance and SRAM interface. Monopolize the 1~16M market for “code storage” (XIP == EXCUTE IN PLACE, such as MCU FLASH);
2, the dark place–Sasuke: NAND FLASH->non-volatile read and slow write Enter the fast main thesis>16M market is used for “data storage” (such as SD card)