V-Series Transceiver PHY IP Core User Guide

ID 683171
Date 7/26/2022
Public
Document Table of Contents

7.13. XAUI PHY Clocks, Reset, and Powerdown Interfaces

This section describes the clocks, reset, and oowerdown interfaces.
Figure 43. Clock Inputs and Outputs for IP Core with Hard PCS
Figure 44. Clock Inputs and Outputs for IP Core with Soft PCS
Table 91.  Optional Clock and Reset Signals
Signal Name Direction Description
pll_ref_clk Input This is a 156.25 MHz reference clock that is used by the TX PLL and CDR logic.
rx_analogreset Input This signal resets the analog CDR and deserializer logic in the RX channel. It is available only for the hard IP implementation.
rx_digitalreset Input PCS RX digital reset signal. It is available only for the hard IP implementation.
tx_digitalreset Input PCS TX digital reset signal. If your design includes bonded TX PCS channels, refer to Timing Constraints for Reset Signals when Using Bonded PCS Channels for a SDC constraint you must include in your design. It is available only for the hard IP implementation.
xgmii_tx_clk Input The XGMII TX clock which runs at 156.25 MHz. Connect xgmii_tx_clk to xgmii_rx_clk to guarantee this clock is within 150 ppm of the transceiver reference clock.
xgmii_rx_clk Output This clock is generated by the same reference clock that is used to generate the transceiver clock. Its frequency is 156.25 MHz. Use this clock for the MAC interface to minimize the size of the FIFO between the MAX and SDR XGMII RX interface.

Refer to Transceiver Reconfiguration Controller for additional information about reset.