In Pentium systems,the CPU generates logical addresses,which are given to the segmentation unit.The segmentation unit produces
a linear address for each logical address.The linear address is then given to the paging unit,which in turn generates the physical
address in main memory.Thus,the segmentation and paging units form the equivalent of the memory-management unit(MMU).

Segmentation:

The Pentium architecture allows a segment to be as large as 4 GB, and the maximum number of segments p