Intel® Arria® 10 Transceiver PHY User Guide

ID 683617
Date 9/15/2023
Document Table of Contents
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3.9.2. PMA and PCS Bonding

PMA and PCS bonding reduces skew between both the PMA and PCS outputs within a group of channels.

For PMA bonding, either x6/xN or PLL feedback compensation bonding is used. For PCS bonding, some of the PCS control signals within the bonded group are skew aligned using dedicated hardware inside the PCS.

Figure 185. PMA and PCS Bonding

For PMA and PCS bonding, the concept of master and slave channels is used. One PCS channel in the bonded group is selected as the master channel and all others are slave channels. To ensure that all channels start transmitting data at the same time and in the same state, the master channel generates a start condition. This condition is transmitted to all slave channels. The signal distribution of this start condition incurs a two parallel clock cycle delay. Because this signal travels sequentially through each PCS channel, this delay is added per channel. The start condition used by each slave channel is delay compensated based on the slave channel's distance from the master channel. This results in all channels starting on the same clock cycle.

The transceiver PHY IP aut