NOR type and NAND-type flash memory is very different

NOR type and NAND-type flash memory is very different, so to speak, NOR-type flash memory like the memory, a separate address lines and data lines, but more expensive, the capacity is relatively small; and NAND-type is more like hard disk, the address line and data lines are shared I / O lines, similar to the hard drive of all information transmitted via a hard line general, NOR and NAND-type flash memory, compared with the cost is lower, while the capacity is much greater.

 

 

Thus, NOR-type flash memory is suitable for frequent random access of the occasion, often used to store program code and run directly in the flash memory, NOR flash cell phone is to use the large, so the phone's "memory" capacity is generally small; NAND-type flash memory mainly used to store data, we used flash memory products, such asflash drives, digital memory cards are using NAND-type flash memory. MCU Flash here a concept we need to correct, that is, the speed of flash memory is very limited, its own operating speed, frequency, much lower than the memory, and NAND-typeflash memory drive mode of operation similar to the efficiency of the direct memory access than the slow way much more.

 

 

Therefore, do not think the performance bottleneck is the flash disk interface, and even taken for granted that after the flash drive with USB2.0 interface, will be a huge performance boost.