IMPORTANT POINTS REGARDING INTERFACING

SOME IMPORTANT POINTS TO BE REMEMBERED WHILE DOING MAPPING
–> input and ouput port can have same address they can be differentiated by RD(bar) and
WR(bar) control signals.
–> In peripheral mapping it doesnot matter whether you use higher order address line or 
lower order address line. port address is duplicated on both segments of address 
lines.
–> To recongnize type of mapping just examine the control signal if its a MEMW/MEMR signal
then its a memory map if IOW/IOR signal its peripheral map.

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