TUSB2077A: TUSB2077A : Unknown USB Device Problem

1: pls check if crystal works.

2: hub didn't show up at devce manager, so hub upstream not working?

3" what is this for?

Best

Brian

1. Crystal isn't working... It just shows DC voltage.
2. Yes. Hub Upstream isn't working...
3. My team member says it's just an LED to see the status of USB communication.
Thank you for your quick response.

Dear Mr.Brian

I found some problem from schematic. The Resistor that is connected to DP0PUR was Wrong. I changed that to 1.5k Ohm resistor.

Now my laptop recognizes my circuit as USB HUB.

There is still a problem that the crystal only oscillates in only Reset state, but I will continue to solve it. Thank you for your kind reply.

great, keep update status.

Hello Brian.
As I told you, I'm trying various things. After Changing DP0PUR Resistor, My laptop recognizes my board as USB HUB Now. But Still There are no downstream devices are detected from my device manager.(CH340, CP2104, Etc... ) Do you have any additional advice?

for downstream port, you need to move cap close to hub, and 15k close to connector.

Dear Brian. 
Thank you for your kind reply. I just changed Capacitor with Pull Down Resistor, But It doesn't work.

I found that the capacitor connected in series to the reset side was too small, so I changed it too(Still not working)...

1: is crystal stable?

2: do you have 5v to downstream port?

3: maybe remove this parts first.

Best

Brain

1.It's a little unstable. When it connected to Laptop, usually doesn't work. But it works most of the time when I reconnect it to my laptop.

   I think this problem also should be solved, but I'm trying solve the down stream issue(because i think down stream issue is more serious)

2.Yes. All the down stream port has 5V which is provided by extra power, not USB Port

3.I just removed that circut from few ports, but it wasn't work. In fact, There are no D+/D- signal from USB-UART IC. But They make D+/D- Signal when they connected to Laptop as Several Module...