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VssaA_USB0 and VssA33_USB0 on OMAL-L138 (C6748 DSP)

Other Parts Discussed in Thread: OMAP-L138, OMAPL138

Sorry if this is the wrong place to ask this question, but in any case, 

On the LCDK schematic the OMAP-L138 power section shows that pins VssA_USB0 and Vssa33_USB0 are not connected even though USB0_VDDA33 is connected to VCC_3V3D. I tried to find a reason for these two pins to be disconnected on the datasheet but couldn't. I have used USB0 fine actually (it works), just interested to know why these two are disconnected?.

Thank you,