23.1 EHCI spurious stop when Suspend mode occurs on port A

If port A enters Suspend mode (via the USB device controller or the USB host controller), the EHCI clock stops, which can block the EHCI if it uses the other ports (B/C). This occurs after about 2 µs (≈ 120 clock cycles).

Work Around

Set the SFR_EHCIOHCI.PHYCLK bit so that the EHCI clock remains activated in Suspend mode, with no power saving.

Affected Silicon Revisions