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what's the maxim capacity of SDRAM or DDR and NAND flash that AM1705 and AM1707 can support?

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Other Parts Discussed in Thread: AM1705, AM1707

I am puzzled by below passages come from the datasheets and AM17x EVM Kit Features:

AM1705 datasheet:

EMIFB – 16-Bit SDRAM With 256MB Address Space

HARDWARE FEATURES AM1705
EMIFB 16-bit , upto 512Mb SDRAM
EMIFA Asynchronous (8/16-bit bus width) RAM, Flash, NOR, NAND

AM1707 datasheet::

  – EMIFA   
 • NOR (8-/16-Bit-Wide Data) • NAND (8-/16-Bit-Wide Data) • 16-Bit SDRAM With 128MB Address    Space

– EMIFB   
 • 32-Bit or 16-Bit SDRAM With  With 256MB Address Space 

HARDWARE FEATURES AM1707
EMIFB 16/32bit, upto 512Mb SDRAM
EMIFA Asynchronous (8/16-bit bus width) RAM, Flash, 16bit upto 128Mb SDRAM, NOR, NAND

AM17x EVM Kit :

  • Includes one SOM
    • AM1707 SOM-M1 (128 MB DDR)
  • User Interface (UI) Board
    • 8 MB NOR flash
    • 512 MB NAND flash