Here are some register examples from
IBM
http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/6ED822DD7E97D889872570B200607EEC/$file/CBE_Public_Registers.v1_5.02APR2007.pdf
See chapter 2 of:
http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/F7E732FF811F783187256FDD004D3797/$file/pem_64bit_v3.0.2005jul15.pdf
General information and types of documentation:
http://www-01.ibm.com/chips/techlib/techlib.nsf/products/Cell_Broadband_Engine
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