IMX53 with external USB phy via ULPI bus

[jomeke]

Hi all,

I am planning to use the IMX537 with a external USB phy connected on USB_HOST3

The used phy is from Texas Instruments "TUSB1210" and is connected to the IMX via the ULPI bus.

The clock pin on the TUSB1210 can be input or output but what about the IXM side ? in de manual IMX53IEC.PDF the pin CSIO_DAT6 is only noted as input.

Is it possible the use the CSIO_DAT6 pin as clock output ?

Regards

Johan

[TheAdmiral]

Yes, CSI0_DAT6 is used as a clock output for USBH3. The pin is configured for this mode when PINMUX ALT4 is assigned to the pin, and the control PAD settings are assigned accordingly. You should probably be using the Reference Manual IMX53RM.PDF for this type of information. Chapter 43 discusses the registry settings to assign the PINMUX selection and to assign PAD control settings (need to touch two registers). Chapter 77 discusses the USB controllers, and also discusses how the clock signals are derived. Best to use example code contained in the LTIB libarary.