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USB Superspeed Peripherals

DaBo_288066
New Contributor

Hi all,

   

dealing with FX3S power management I see on its manual (CYUSB303X_001-84160_0D_V.pdf,  page 13) an interesting suspend mode: "
Suspend mode with USB 3.0 PHY disabled (L2)". The strange thing is that "Methods of Exit" is equal to L1, where the PHY is enabled.

   

1 - How can the cpu be re-woken from USB bus if the PHY disabled?

   

2 - Is it possible to enter in L2 suspend mode using the API? this can be very useful to save some mW and reach the (in)famous 2.5mA total suspend current...

   

Thanks

   

Dax

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4 Replies
Anonymous
Not applicable

Hi,

   

Only the USB 3,0 Phy is disabled. The USB 2.0 Phy will still be active and can be used for wakeup. Yes the CyU3PSysEnterStandbyMode Api can be used to bring the device to this mode and achieve the specified current.

   

Regards,

   

-Madhu

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Anonymous
Not applicable

Typo CyU3PEnterStandByMode mode API

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DaBo_288066
New Contributor

Hi, thanks for your reply.

   

Maybe the typo was the 2nd function name because into API documentation I can only find the 1st function name (CyU3PSysEnterStandbyMode). Anyway CyU3PSysEnterStandbyMode requires the shutting down of all block except GPIO. This function seems suitable for a self-powered application, not a bus-powered as in our project.

   

The right function seems to be CyU3PSysEnterSuspendMode, where the CY_U3P_SYS_USB_WAKEUP_SRC_EN can be used. In this case i tried to use CyU3PConnectState to power off the phy, as suggested by documentation, but the subsequent call to CyU3PSysEnterSuspendMode returns CY_U3P_ERROR_BAD_ARGUMENT and the device re-enumerates.

   

Is there a specific sequence to enter L2 suspend mode with USB activity as wakeup source?

   

Thanks

   

Dax

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DaBo_288066
New Contributor

Hello? is there somebody in? 😉

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