RX Polarity Control

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

If the RXP and RXN differential I/O signals are swapped on the PCB, then the differential data transmitted by the PS-GTR transceiver TX are reversed. The PS-GTR receiver allows inversion to be done on parallel bytes in the PCS after the SIPO to offset reversed polarity on the differential pair. RX polarity control can be accessed using the SERDES.L{0:3}_TM_MISC1 [7] register bit. To enable RX polarity reversal, set bit 7 High so RXP is negative and RXN is positive.