Using UTXD3 pin on SAMS70J21

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I was hoping to create another serial output stream using the UTXD3 pin on a SAMS70J21. The data sheet claims it is connected to Pin 2 on the 64 pin package.  When I try to use UART3 to transmit serial data from this pin I get no response from the device.

The data sheet also claims that UTXD4 is connected to Pin 55.

It appears that UART 3 and 4  are disabled in the chip. If so, why are these TX pins listed as being connected to the respective UARTs.

 

Anyone have additional insight to this?

 

Regards

erik

erik piip
tartu EE.