8086 internal architecture:

BIU (Bus Interface Unit):-
  • ·       It sends out tasks.
  • ·       It fetches instructions from memory.
  • ·       It reads data from memory and ports.
  • ·       It also writes data from memory and ports.
  • ·       So BIU takes care of all the address and data transfers on the buses.

Execution Unit:-
  • ·       It tells the BIU, from where to fetch the instruction or data.
  • ·       It decodes the fetched instructions.
  • ·       It executes the fetched instructions.  
  •    EU takes care of performing operations on data.

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