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USB hosts hubs transceivers

Anonymous
Not applicable

I have 20 new prototype boards using the CY7C65632-28. A couple of the board came up and the USB works properly. On most the USB Hub doesn't work. The 12MHz oscillator will only run when the hub is held in reset. The HUB is configured as self powered and the gang input is connected to ground with a 100K resistor. Reset uses the recommended reset from Cypress. 10K to 5V and 47K  in parallel with 1uF to ground.

   

Anybody had similar experience?

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8 Replies
Anonymous
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 Hi,
   
Please create a tech support case (MyAccount -> MyCases) so that one of our engineers can help you out in this.        
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Anonymous
Not applicable

 We are having the same problem. Would you be willing to share what happened and/or how the issue was resolved?

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Anonymous
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I have the same problem.

   

I use a mikrocotroller for controlling the reset pin (see schematic).

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Mitchell_shen
Level 4
5 solutions authored First solution authored 50 questions asked
Level 4

Consider the following parameters when you select the crystal:
20 pF rating on the crystal
12 MHz ± 0.05%
Parallel resonant, fundamental mode
20 pF capacitors for load caps
600 μW drive

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Anonymous
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        Hi, Keep hub in reset, attach a device to any of the DS(Downstream) port and check enumeration of the DS device. Please let me know the behaviour. Regards Prajth   
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Max_Li
Employee
5 questions asked First solution authored 10 sign-ins
Employee
        Is there some result? Max   
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Max_Li
Employee
5 questions asked First solution authored 10 sign-ins
Employee

 My customer met same problem. Crystal just OSC when reset low.

   

And finally the found the D+ and D- connect reverse. You can check it.

   

Max

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Anonymous
Not applicable

 Hi Max,

   

 Thanks for posting the solution here.

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