Difference between Software Architecture document and System Design Document

What is the difference between Software Architecture document and System Design Document? Can anyone provide the co开发者_StackOverflowntents to be captured in SAD??

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System usually refers to a product consisting of more than one softwares and/or hardwares. A System Design Document is written from the point of view of the System.

A Software Architecture Document DOES refer to the Software's connectivity to other modules/the System. But it is written from the point of view of the Software.