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)