HD3SS3220: USB-C SuperSpeed Mux, DFP

Hi Reto,

I reviewed your schematic and attached my comments in the pdf file below. There weren't any issues that I saw.

Reto Himmler said:

SSRX/SSTX from USB-B 3.0 through the Mux to the USB-C 3.0

It is ok to route SSTX to the SSRX pins on the MUX, as long as the correct channel is connected on both sides. You have SSTX connect through the RX pins on the MUX, which is ok because you connect the RX1/2 pins to SSTX1/2 on the Type-C connector. Our EVM does the same routing.

Reto Himmler said:

are these capacitors on the correct lines: C104, C107. C108, C109, C110, C111 ?

These are correct. You are AC coupling one side of the MUX on both the TX path and the RX path. This is ok to do and is reflected in the design of the 3220 EVM.

Reto Himmler said:

setting of direction (ID, !EN_MUX, CCS1 and CCS2) ?

You've connected CC1 and CC2 correctly to the Type-C connector. Routing ID to the EN_MUX pin is ok, because ID will go low when a connection is made and enable the MUX.

Best,

Shane

HD3SS3220 review.pdf