E-Tile Transceiver PHY User Guide

ID 683723
Date 9/08/2023
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3.3.1. RS-FEC Modes

Table 51.  Example Applications for Various FEC Modes
Supported RS-FEC Modes RS-FEC Receives Data From Example Applications Details
Fractured EHIP_LANE

25GbE - NRZ w/FEC (528, 514)

You can configure all six FEC blocks per E-tile in this mode.

NRZ mode: Four lanes within a FEC block operate independently for single lane protocols. However, RS-FEC needs to be shared among the NRZ channels within one IP instantiation.

FPGA core

CPRI 24G - NRZ w/ FEC (528, 514)

32GFC w/ FEC (528, 514)

Aggregate EHIP_CORE

100GbE (4 x 25G) – NRZ w/ FEC (528, 514)

100GbE (2 x 50G) – PAM4 w/ FEC (544, 514)

You can configure a maximum of four out of six FEC blocks per E-tile in this mode. Refer to E-Tile Floor Plan Configurations for more details.

Four lanes of a FEC block are used together for multi-lane protocols, like 100GbE.
PMA Direct 128 GFC
Bypass

10GbE – NRZ

25GbE - NRZ w/o FEC

100GbE (4 x 25G) – NRZ w/o FEC

Protocols or applications that do not need RS-FEC

You can configure RS-FEC blocks in many possible combinations depending on your application requirements.

Figure 60. E-Tile Floor Plan ConfigurationsThis figure illustrates the placement of various architecture blocks, and the modes supported in the RS-FEC blocks.
Figure 61. Datapath Routing for RS-FEC ConfigurationsSupported RS-FEC configurations are shown in Example Applications for Various FEC Modes.
Table 52.  FEC Block Modes by ChannelThis table corresponds to Example Channel Configurations Implementing Various FEC Modes using the E-Tile Channel Placement Tool and Channel Configurations Implementing Various FEC Modes
Channels FEC Block Mode FEC Receives Data From
0 to 3 Aggregate EHIP_CORE
4 to 5 Bypass N/A
6 to 7 Bypass EHIP_LANE
8 to 9 Fractured EHIP_LANE
10 to 11 Fractured FPGA core
Figure 62. Example Channel Configurations Implementing Various FEC Modes using the E-Tile Channel Placement ToolYour implementation may vary depending on your intended application. Check FEC Block Modes by Channel for configuration description.

Refer to the E-Tile Channel Placement Tool for details about possible channel placement based on system requirements.

Figure 63. Channel Configurations Implementing Various FEC Modes Check FEC Block Modes by Channel for configuration description.