Arduino Due spec says it has a SAM3X8E microcontroller and 96KB SRAM: https://www.arduino.cc/en/Main/ArduinoBoardDue
SAM3X8E spec says that it has 100KB of SRAM: http://www.atmel.com/images/atmel-11057-32-bit-cortex-m3-microcontroller-sam3x-sam3a_datasheet.pdf#page=32
So can the 4KB of NFC SRAM of SAM3X8E somehow be used with Arduino IDE?
SRAM0 and SRAM1 are in the bit band region. The bit band alias region is mapped from 0x2200 0000 to 0x23FF FFFF.
The NAND Flash Controller (NFC) embeds 4224 bytes of internal SRAM. If the NFC is not used, these 4224 Kbytes can be used as general-purpose SRAM. It can be seen at address 0x2010 0000.