I'm using a TUSB2046B hub connected to a raspberry pi zero. The hub circuit looks like this:
There appears to be a 12MHz sine wave coming from the crystal (as counted by my scope) and 3.3V on the VCC, /EXTMEM and EEDATA pins. If I connect a device to the Pi using a USB OTG micro-to-micro cable, lsusb shows the device. But if I connect the hub shown in the diagram, it shows nothing. And I don't see any signalling on the USBDM / USBDP lines when I inspect them with the scope.
Have I got something seriously wrong? Is there some good reason it's not talking back to me?
Answer
You have no speed setting selected for the uplink. In the datasheet Figure 11 it shows the complete schematic.
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