Question: Given your own example for segment table and logical addresses, calculate the physical addresses.

Solution:

Problem:
A simple segmentation system has the following segment table:

Starting Address    Length (bytes)
660    -     -     -     -    248
1752    -     -     -     -   422
222     -     -      -     -  198
996    -     -       -     -  604
Determine the physical address for the following logical addresses; indicate segment faults.

Answer:

First, you have to check if (offset < segment limit) for the problem. If it is, add offset + base address for the physical address. If it is not, a segment fault will occur.

a) (0, 198) we will check 198< 248, which is true so we will calculate Physical address = 660+ 198 = 858.

b) (2, 156) we will check 156< 198, which is true so we will calculate Physical address = 222+ 156= 378.

c) (1, 530) we will check 530< 422, which is false so segment fault occur.

d) (3, 444) we will check 444< 604, which is true so we will calculate Physical address = 996+ 444= 1440

e) (0, 222) we will check 222< 248, which is true so we will calculate Physical address = 660+ 222= 882