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Authors:
Linda Null ,julia Lobur
Chapter:
Marie An Introduction To A Simple Computer
Exercise:
Review Of Essential Terms And Concepts
Question:20 | ISBN:9780763704445 | Edition: 3

Question

20. Why is address alignment important?

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Answer

The alignment of the access refers to the address being a multiple of the transfer size. For example, an aligned 32 bit access will have the bottom 4 bits of the address as 0x0, 0x4, 0x8 and 0xC assuming the memory is byte addressed. An unaligned address is then an address that isn't a multiple of the transfer size.

 Any attempt to access a data value or instruction using an address that is not properly aligned will result in a hardware trap being generated.This is the reason why Address alignment is important.

 

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