E-Tile Transceiver PHY User Guide

ID 683723
Date 7/08/2024
Document Table of Contents

3.1.8. PMA Interface

The PMA interface block contains the FIFO and the gearbox.
Figure 57. TX Data FlowSimplified blocks. The FIFO is indicated in the red box.
Figure 58. RX Data FlowSimplified blocks. The gearbox is indicated in red.

The TX PMA interface FIFO is in the datapath for all modes of operation such as:

  • PMA direct
  • PMA direct high data rate PAM4 modes
  • RS-FEC

The two TX FIFO modes are elastic or phase compensation. Elastic mode is identical to Basic mode in L/H-tiles where you can monitor the FIFO full or empty and almost full or empty signals. The control FIFO writes and reads through the read and write enable ports.

Refer to Supported Applications/Modes for more details about these modes, and refer to the PMA Interface section for more details about the E-Tile Native PHY PMA Interface.