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Original question:

TUSB8041: Port configuration and clock input

TUSB8041: FULLPWRMGMTz = High case

Oba
Genius 17385 points
Part Number: TUSB8041

Hello

 

In the below post,

 

https://e2e.ti.com/support/interface/f/138/p/770542/2852569

 

you said “ If any of the ports are not fully power managed (power is always on or not controlled by PWRCTL outputs of the hub), then the hub should be marked as not fully power managed.”

 

For example, Port 1 has a power switch and Port 2 doesn’t have a power switch and FULLPWRMGMTz  = High.

In this case, does overcurrent reporting still work on Port 1? And When overcurrent event happens, does the host try to switch off Port 1 in this configuration.

I’m afraid of both overcurrent reporting and switch off not working at all on port 1 if FULLPWRMGMTz  = High.

 

Regards,

Oba

  • 0
    TI__Guru 60870 points
    Hello Oba,

    Yes, overcurrent reporting works the same regardless of the setting of the FULLPWRMGMTz pin. Full power management impacts only the hub descriptors reported by the TUSB8041 and USB 3.x downstream port behavior in the logically powered off condition. You can see Figure 10-10 in the USB 3.x specification for more information - the main difference is whether there are additional resets when the port is logically powered off to keep connected USB 3.0 devices from entering unexpected states.

    Regards,
    JMMN