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.
- · 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.