Difference between r1.2 and the current
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CA
http://msl.yonsei.ac.kr/class/CSI3102_2006/
PLA: http://blog.naver.com/nsesibong?Redirect=Log&logNo=60024031449
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
