how do you configure off-chip code and xdata memory in target options?

Hello,
I'm having trouble understanding a demo code I'm working with.

The chip is d 71M6543 from teridian, which has 64k flash,
And 5k xdata.

It is an SOC, so the data and code memory are shared between two cores.

In the 'target' tab of the project options, under off-chip code memory,
Thr range is set to 0x0400 to 0xFC00

While for off-chip xdata memory, the range is set to:
0x0520 to 0x0EE0

This range is smaller than the maximim adressable memory for the chip.

What is the implication of this values to the code been compiled by keil?

Thanks.

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