E-Tile Transceiver PHY User Guide

ID 683723
Date 9/30/2022
Public
Document Table of Contents

9.2.8. 0x000E: RX Phase Slip

Attribute Code

0x000E

Description

This attribute code is used during the dynamic reconfiguration rate change to adjust the phase offset of a recovered clock to the intended data rate selected based on your requirements.

  • 0x84[7:0]: 0x00
  • 0x85[5:0]: Phase slip count (each slip slips by 1 UI). Recommended phase slip settings based on the RX PMA modulation type (NRZ or PAM4) and the RX PMA interface width settings in the E-tile transceiver Native PHY IP core:
    • NRZ Mode
      • RX PMA interface width = 16: phase slip = 12
      • RX PMA interface width = 20: phase slip = 16
      • RX PMA interface width = 32: phase slip = 28
      • RX PMA interface width = 40: phase slip = 36
    • PAM4 Mode
      • RX PMA interface width = 32: phase slip = 12
      • RX PMA interface width = 40: phase slip = 16
      • RX PMA interface width = 64: phase slip = 28
  • 0x85[6]: 1’b0
  • 0x85[7]: 1’b1 always asserted to apply these slips every time RX is enabled

Disabling and enabling the PMA multiple times without a PMA analog reset results in multiple RX phase slips being applied. The RX phase slip is additive.

PMA Can Be Running While Updating PMA Attribute?

Yes

Return Value {0x89[7:0],0x88[7:0]}

N/A

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