TX Polarity Control

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

When the TXP and TXN differential I/O signals are swapped on the PCB, the differential data transmitted by the PS-GTR transceiver TX is reversed. One solution is to invert the parallel data before serialization and transmission on the differential pair. The TX polarity control can be accessed using the SERDES.L{0:3}_TX_ANA_TM_13 [3:2] register bits. To enable TX polarity reversal, set these two bits High so TXP is negative and TXN is positive.