Memory mapping

In LPC21xx ARM7 MCUs, when the MEMMAP[1:0]register=00 ,ie in bootloader mode,the interrupts are mapped from on chip flash to a new location at 0x7FFF E008.But this address is somewhere near 2GB in addres space and the MCU has 16kb ram and 256 kb flash, all of which end at 0x4000 3FFF. Then where is this 'mapped copy' actually copied? Surely, there is no physical storage element present at 0x7FFF E008.

Thanks in advance.

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