Segment Descriptor. Segment Descriptor. Segments are areas of memory defined by a programmer and can be a code, data or stack segment.
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B=0 : Task is not busy
B=1 : Task is busy
Physical address calculation in the protected virtual address mode
1) PLs > Pldesc->access to segment allowed.
2)MMU checks__> Pdesc determine__> segpresent__>phymem.
3) exception load__>segmemreturn__> interrupted prog.
4) 1st & 2nd step satisfied MMU will add 16 bit offset.