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USB hosts hubs transceivers Forum Discussions

Anonymous
Not applicable
        Hi,   
   
I'm going to use CY7C65630 like a built-in USB2.0 HUB for set-top-box.   
   
Question:   
   
Sheme is powered from internaly power sourse.   
What state will be pins PWR#[0-4], if VBUSPOWER is low after chip was in normal work mode.   
   
It's posible, to control power all downstream ports by VBUSPOWER state changing?   
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Anonymous
Not applicable

 Hi 

   

 

   

I assume that you are using the self powered hub. For self powered HUB, VBUS monitoring is required because, HUB shouldn't drive data lines when VBUS is not connected or receiving less voltage. So whenever the VBUS goes low, reset is asserted. 

   

 

   

Regards,

   

Vikas.

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Anonymous
Not applicable

 Hi,

   

 Please explain your requirement in detail.

   

Controlling DSP power using VBUSPOWER is not a good idea. Pulling VBUSPOWER signal low will put the device into detached state.

   

-PRJI

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