E-Tile Transceiver PHY User Guide

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

9.2.24.7. Initial Adaptation Effort Levels

To read:

  1. Use attribute code 0x002C and {0x85[7:0],0x84[7:0]}: 0x0118. The value is returned on registers {0x89[7:0],0x88[7:0]}.

To write:

  1. Use attribute code 0x002C and {0x85[7:0],0x84[7:0]}: 0x0118.
  2. Use attribute code 0x006C and {0x85[7:0],0x84[7:0]}:
    • 0x84[1:0] = 0x00 for low effort (00_effort), 0x10 for medium effort (05_effort), 0x01 for full effort (10_effort)
    • 0x84[7:2], 0x85[7:0] is reserved

Low effort initial adaptation can be used for NRZ only. Medium effort initial adaptation can be used for PAM4 only. Full effort initial adaptation can be used for NRZ or PAM4.

Low effort initial adaptation is the quickest to complete and is recommended for NRZ Ethernet AN/LT and CPRI protocols.

Medium effort initial adaptation is recommended for PAM4 Ethernet AN/LT.

Full effort initial adaptation is for general usage and provides the best performance and stability. This is the recommended, and default, adaptation mode.

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