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Description
On Arduino Due schematics PDF file, "PD4" pin of the CPU is connected to "TXD0", and "PD5" is to RXD0. Then, in "Communication" header "TXD0" is to pin nr. 14, "RXD0" is connected to pin nr. 15.
While on the DUE printed board, pin nr. 14 is "TX3", and "pin nr. 15 is "RX3". The same is the naming in due's variant.cpp source file (this is Serial3).
So in Due's schematics PDF file, "TXD0" should be changed to "TXD3", and "RXD0" to "RXD3".