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controlCARD Docking Station [R4.1]板上的3.3V供电是干什么用的?

今天在看controlCARD Docking Station [R4.1]板子的原理图发现板子上通过USB的5V通过TPS79533DCQ转的3.3V没有接到DSPF28379D板上,也没有通过JTAG接口接到DSP上,那这个3.3V主要作用是什么?只是用来生成板子上的3.3V的一些基准信号吗,还有DSPF28379D Control CARD是只需要5V供电就可以了么,板子的功耗在多少啊?