Since Type-C supports reversible insertion, the CC pin is used to detect orientation. From the DFP’s perspective, when CC1 is pulled down, it indicates correct insertion; if CC2 is pulled down, it indicates reverse insertion. After detecting orientation, corresponding USB signals are output—for example, CC1 corresponds to SSTX1 and SSRX1. The right side of the diagram integrates a MUX. Since USB 3.1 data rates reach up to 10 Gbps, to avoid PCB trace branching, the MUX switches signals based on orientation: – Rectangular insertion: Switches to SSRX1 & SSTX1 – Square insertion: Switches to SSRX2 & SSTX2
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