TX/RX pins on Xilinx Zynq
I am assuming you are referring to the TX/RX signals of a UART.

You'll find plenty of information in the SoC Technical Manual, specially in chapter 19. The UART signals can be assigned to different pins which you can see in the table 19-4: UART MIO Pins and EMIO Signal, page 604, or otherwise in the MIO-at-a-Glance Table in page 53.