Can I ask you how much difficult or advanced find you those lectures ?
are those graduate level ?
upper ungraduated/first year graduate ?
Or material is only bachelor level ?
I'd say it's bachelor level. It definitely requires some prior knowledge of digital logic and general computer systems concepts. Here's a link to the course page where you can find the prerequisites and a syllabus and some other info:
http://www.ece.cmu.edu/~ece447/s14/