# NOR and NAND flash memory on the same chip

I've been researching booting and flash memory as found in embedded devices like smartphones, tablets, and boards. There are numerous schemes and an equally numerous amount of obscure terminology. I understand NOR flash allows for XIP. Some NAND chips seem to have special "boot areas" or "boot partitions", and even "boot modes" (though that only makes sense in the context of processors to me).

Setups can utilize boot ROMs embedded in application processors, have separate chips for boot code (on NOR) and system code (on NAND), use U-Boot stored on the internal memory chip as an IPL, or use eMMCs that are boot code-aware with configurable ranges for "boot areas".

Are there memory chips that have a NOR portion and a NAND portion combined into a single address space. That way, say, addresses 0x00000000 through 0x0000FFFF contain a bootloader that can execute in place while addresses 0x00010000 through 0xFFFFFFFF correspond to NAND flash?

• NOR and NAND refer to the structure of the memory cell. the other features are not dependant on memory cell structure, you request for parts is off topic. Jan 21, 2016 at 2:51
• @Jasen Not a request for parts. I'm asking if such a scheme is used. Jan 21, 2016 at 6:03
• I don't think NAND and NOR processes are compatible. So you would not find them together on the same die. Jan 21, 2016 at 8:11
• Also, NOR is huge, in terms of die area. So it would not make sense to combine them. Jan 21, 2016 at 8:12