Organization of Intel 8086 Microprocessor                                                                                                 Print this page
<< Previous |  First |  Last |  Next >>       

Generating a physical address :

  • The content of segment register (segment address) is shifted left bit-wise four times.

  • The content of an offset register (offset address) is added to the result of the previous shift operation.

These two operations together produce a 20-bit physical address.

For example, consider the segment address is 2010 H and the offset address is 3535 H .

The physical address is calculated as:

Segment Address 2010H 0010 0000 0001 0000
Shifted left by 4 bit positions   0010 0000 0001 0000 0000
Offset address 3535H 0011 0101 0011 0101
Physical address   0010 0011 0110 0011 0101
   
2
3
6
3
5H

<< Previous |  First |  Last |  Next >>