80386DX Block diagram

Simpler block diagram for 80386 architecture:

Architecture is divided into mainly three parts:
1. Execution unit: Carries the function for reading, decoding and executing the instructions.

2. Memory management unit: Carries the function of conversion of Logical address into physical address.
MMU unit is again divided into two parts:
      i. Segmentation Unit: Converts Logical address into linear address
      ii. Paging Unit: Converts Linear address into physical address
3. Bus Interface unit: Deals with external peripheral of microprocessor.