8086 Internal Architechture

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.