K61 USBHS USBn_PWRFAULT signal question

[isaotakashima]

I'm using the K61 to support USB High-Speed Host controller.

According to the TWR-K70F120M and TWR-SER2 schematics, the Fault Flag signal of the VBUS switch connected to the VBUS_DT signal of the USB3300 USBHS PHY.

According to the K61 reference manual (K61P256M150SF3RM, Rev 2), the K61USBHS OTG controller will detect over-current condition by below two bit in the USBHS_PORTSC1 register.

- bit 5 OCC  Over-Current Change

- bit 4 OCA  Over-current active

But the K61 does not have the USBn_PWRFAULT, and does not connect the Fault Flag signal of the VBUS switch to any pin of the K61.

Here is questions.

1. Can we use the USBHS_PORTSC1 bit 5 OCC and bit 4 OCA to detect over-current condition?

2. To detect over-current condition, should we connect the Fault Flag signal of the VBUS switch to a pin of the K61?

  If so, please let us know it pin name.

Please reply as soon as possible.

Best regards,

Takashima

[Kan_Li]

Hi Takashima,

The VBUS_DT signal of the USB3300 USBHS PHY has nothing with Over-Current condition, it is used to detect the external VBUS availability. so on TWR-SER2, when the VBUS switch detects an external available, it would notify the USB3300 USBHS PHY, which would be reflected in its internal status register.

Have a great day,
Kan

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