Intel® Arria® 10 Transceiver PHY User Guide

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ID 683617
Date 3/28/2022
Public
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2.9.1. Using the 'Basic (Enhanced PCS)' and 'Basic with KR FEC' Configurations of Enhanced PCS

You can use Arria 10 transceivers to configure the Enhanced PCS to support other 10G or 10G-like protocols. The Basic (Enhanced PCS) transceiver configuration rule allows access to the Enhanced PCS with full user control over the transceiver interfaces, parameters, and ports.

You can configure the transceivers for Basic functionality using the Native PHY IP Basic (Enhanced PCS) transceiver configuration rule.

Basic with KR FEC is a KR FEC sublayer support with a low latency physical coding sublayer (PCS). The KR FEC sublayer increases the bit error rate (BER) performance of a link. This mode can run up to a data rate of 25.8 Gbps. Use this configuration to implement applications with low latency or low BER requirements or applications such as 10 Gbps, 40 Gbps or 100 Gbps Ethernet over backplane (10GBASE-KR protocol).

The Forward Error Correction (FEC) function is defined in Clause 74 of IEEE 802.3ap-2007. FEC provides an error detection and correction mechanism that allows noisy channels to achieve the Ethernet-mandated Bit Error Rate (BER) of 10-12. The FEC sublayer provides additional link margin by compensating for variations in manufacturing and environmental conditions. To distinguish it from other FEC mechanisms (for example, Optical Transport Network FEC), FEC as defined in Clause 74 of IEEE 802.3ap-2007 is called KR FEC.

Note: This configuration supports the FIFO in phase compensation and register modes, and KR FEC PCS blocks. You can implement all other required logic for your specific application, such as standard or proprietary protocol multi-channel alignment, either in the FPGA fabric in soft IP or use Intel's 10GBASE-KR PHY IP core product as full solutions in the FPGA.
Figure 121. Transceiver Channel Datapath and Clocking for Basic (Enhanced PCS) Configuration
Figure 122. Transceiver Channel Datapath and Clocking for a Basic with KR FEC ConfigurationClock frequencies in this figure are examples based on a 10.3125 Gbps data rate.

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