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TMS570LC4357: largest external NV memory I can attach to HERC

Part Number: TMS570LC4357

I currenltly have designed into my HERC EMIF interface a MT28EW128ABA1LPC-0SIT 128MBit parallel NOR flash .  What is the largest NV type memory I can attach to the Herc?

I was thinking I could use a SPI bus to access a SPI flash....

just wondering...

doesnt have to be ultra fast....just want to hang as much external memory on it as possible for data storage.

thank you for your response!