GTS Ethernet Intel® FPGA Hard IP User Guide

ID 817676
Date 8/05/2024
Public
Document Table of Contents

A.1. Datapath Description

In the transmit direction, the MAC accepts client frames, and inserts inter-packet gap (IPG), preamble, start of frame delimiter (SFD), padding, and CRC bits before passing them to the PHY. You can configure the MAC to accept some of the additions with the client frame. The MAC also updates the TX statistics counters. The PHY encodes the MAC frame as required for reliable transmission over the media to the remote end.

In the receive direction, the PHY passes frames to the MAC. The MAC accepts frames from the PHY, performs checks, updates statistics counters, strips out the CRC, preamble, and SFD, and passes the rest of the frame to the client. In RX preamble pass-through mode, the MAC passes on the preamble and SFD to the client instead of stripping them out. You can configure the MAC to provide the full RX frame at the client interface, the frame with CRC bytes removed, or the frame with CRC and RX PAD bytes removed.

Note: When a link fault occurs in the receive direction, the IP clears the RX statistic counters.

The IP core handles the frame encapsulation and flow of data between client logic and an Ethernet network through a 10GE Ethernet PHY implemented in hard IP, with optional various Forward Error Corrections (FEC). For designs that include FEC, the gearbox (GB) enables automatically. The gearbox option for Firecode FEC is 32:33 and 32:40 for RS-FEC.

Figure 79. GTS Ethernet Intel® FPGA Hard IP High Level Functional Overview