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microprocessor - external memory (DDR, DDR2..

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pragash

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I'm currently selecting microprocessor and one of the major concerns is external memory/flash. I need 4G of flash for our application. Many datasheet of microprocessor did not specify how much external memory it can support. For example, refer to, link below. Is there any way to know the external memory which this processor can support?

https://cache.freescale.com/files/32bit/doc/data_sheet/IMX28CEC.pdf?pspll=1
 

Hi Pragash, the data sheet says that the GPMI interface supports up to eight(8 bit wide) NAND Flash devices. The address and data is multiplexed over the 8 bit bus lines. Thus a 32 bit address would require 4 address write cycle. Since the i.MX28 is a 32 bit processor it should be able to support the 4Gb Flash without any problems. Everything depends on the GPMI controller. The best is to get the confirmation by the manufacturer or study the reference manual: https://cache.freescale.com/files/d...ORMAT=pdf&WT_ASSET=Documentation&fileExt=.pdf

Enjoy your design work!
 
32bit address bus means it can address 2^(32) locations and if your data bus size is also 32 then 2^(32)x32 bits.
 
so is that means

external memory = 2^(MCU address bus for GPMI) x MCU data bus
 

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