E-Tile Transceiver PHY User Guide

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

7.2. Dynamic Reconfiguration Maximum Data Rate Switch

If you use multiple transceiver channels in an E-tile, where at least one is configured in PAM4 high data rate (> 30 Gbps), you cannot change the data rate on any other channel on the same tile by greater than 20 Gbps (regardless of whether the channels are NRZ or PAM4) at a time in order to minimize the rate switch's effect on the PAM4 high data rate channel’s link performance. You must step the data rate change, with a minimum step duration of 200 ms.

For example, if you have the following configuration:
  • One PAM4 high data rate channel running at 56 Gbps (channel a)
  • One NRZ channel running at 28 Gbps (channel b)

And you want to change the data rate on the second channel from 28 Gbps to 5 Gbps, you must do it in two steps (first changing the data rate from 28 Gbps to 8 Gbps and then from 8 Gbps to 5 Gbps), with channel b running at 8 Gbps for a minimum of 200 ms. However, if you want to change the data rate on channel b from 28 Gbps to 25 Gbps, there is no restriction since the data rate change delta is less than 20 Gbps.

Did you find the information on this page useful?

Characters remaining:

Feedback Message