c674：
是c67（浮点）+c64（定点） 兼容的
http://processors.wiki.ti.com/index.php/-mv_option_to_use_with_the_C674x
http://www.deyisupport.com/question_answer/dsp_arm/omap_l1x/f/54/t/20792.aspx
http://linhanzu12.blog.163.com/blog/static/6142989820116732030630/
http://www.deyisupport.com/question_answer/dsp_arm/c6000_multicore/f/53/t/5523.aspx
http://processors.wiki.ti.com/index.php/Download_CCS
http://blog.sina.com.cn/s/blog_6cfc41110100p2v1.html