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)
RAM's access time is in interms of nanoseconds. My controller is working with 11.0592Mhz so takes 1.085microsecond for every instruction which is much much greater than RAM access time. these 2 numbers are NOT related, you need 70ns or better. Erik