TUSB8041: Initial operation struggles

Hi Anthony:

    I didn't see issues in schematic, so the hub can not be detected by PC host?

    Please follow the following procedure to check first.

(+) [FAQ] TUSB8041A: Debug procedure if TI TUSB80xx or TUSB40xx hub can not be detected by USB host - Interface forum - Interface - TI E2E support forums

Regards

Brian

Thanks for the reply... correct the hub isnt detected by the host. 
I will run through the debug procedure now. 
Many thanks again - Anthony 

Hi Brian, Please see my replies below

1: Check power on reset sequence waveform for 3.3v ,1/1v and GRSTz pin and see if  it meets hub power on reset sequence timing   

               Could you elaborate on this please? Or is it something documented in the datasheet somewhere? Thanks 

2: Check voltage on USB_VBUS pin and see if the voltage is around 0.5v

                The voltage here is 0.49v

3: Check if the crystal is oscillating  after upstream port is connected to host
                the xtal is oscillating but is very noisy actually... best measurement output frequency i can get is somewhere between 200 and 300khz. so i guess the issue roots from there. Any ideas why this would be? The xtal, its caps and the 1M ref resistor all are present and correct. 

4: Do not enable SMBUSz with a pulldown unless a SMBUS host is used, otherwise the hub will hang waiting for configuration
                this pin is left floating - the resistor r5 is not fitted (voltage is measuring approx 3.3v)

5: Do not connect SDA/SCL to an on-board I2C bus unless it will be used

              these pins are not currently connected to anything 

6: Do not leave blank EEPROMs connected to the hub if not used, the hub will enter a programming mode.

             no eeprom connected 

7: Please make sure the  layout incorporates the thermal pad as shown in the datasheet.

            yes i believe it to be correct as per the datasheet