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problem in interfacing external RAM

I am using P89LVRD2BN which has 768 XDATA RAM.I tried to extend my XDATA by providing external RAM through 74LS373 LATCH.
so when I am definig more XDATA variables,I am expecting the variables shuld automatically assignd the addresses in External RAM.
But these thing are not happening.
My settings are EXTRAM = 0 and AO = 0.(Reset Values)

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