CA 
http://msl.yonsei.ac.kr/class/CSI3102_2006/

PLA: http://www.cs.umd.edu/class/spring2003/cmsc311/Notes/Comb/pla.html

Datapath: http://larc.ee.nthu.edu.tw/~cthuang/courses/ee3450/lectures/05_multicycle-datapath.html