Hi, I am currently designing a custom carrier board that has, among other things, ethernet, micro SD,and 3 USB(1 3.0 and 2 2.0) and I have some questions that I would be very thankfull if you could help me.
In the OEM product design guide it says: “Contact Broadcom for the Carrier board placement/routing guidelines”, I tried contacting them a couple of weeks ago, but with no luck. Is there documentation or anything that you could provide of how implement the routing of this?.
According to the documents the SD interface has C_DETECT and C_WR_PROTECT, but the micro SD connectors that I have seen have only a PIN that detect that a card has been inserted, there isn’t a write protection, how can I handle this?, do I leave it floating?, do I connect it to ground?. Also if the card has been inserted, the C_DETECT should be LOW?.
in the schematics and the OEM, the USB 2.0 and 3.0 have USB[0:1]_EN_OC, but the USB2_EN_OC is not connected, can I route the USB_VBUS_EN0 to another load switch in parallel to supply voltage to the other USB 2.0?? is there another problem with this?.
and since I will not be using USB OTG the USB0_OTG_ID should be left floating?
excuse the many questions.