F-Tile Low Latency 50G Ethernet Intel® FPGA Soft-IP User Guide

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ID 758946
Date 5/10/2023
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Document Table of Contents
Document Table of Contents x
1. About the F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP User Guide 2. About this IP 3. Getting Started 4. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP Parameters 5. Functional Description 6. Reset 7. Interfaces and Signal Descriptions 8. Control, Status, and Statistics Register Descriptions 9. Document Revision History for the F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP User Guide
2. About this IP x
2.1. Release Information 2.2. Features 2.3. Device Family Support
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IP Cores 3.2. Specifying the IP Core Parameters and Options 3.3. Simulating the IP Core 3.4. Generated File Structure 3.5. Integrating Your IP Core in Your Design 3.6. Compiling the Full Design and Programming the FPGA
3.1. Installing and Licensing Intel® FPGA IP Cores x
3.1.1. Intel® FPGA IP Evaluation Mode
3.5. Integrating Your IP Core in Your Design x
3.5.1. Pin Assignments 3.5.2. Adding the F-tile Reference and System PLL Clocks Intel® FPGA IP 3.5.3. Placement Settings for the 50G Ethernet Intel FPGA IP Core
5. Functional Description x
5.1. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP Functional Description 5.2. User Interface to Ethernet Transmission
5.1. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP Functional Description x
5.1.1. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP TX MAC Datapath 5.1.2. 50 GbE TX PCS 5.1.3. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP Core RX MAC Datapath 5.1.4. Link Fault Signaling Interface 5.1.5. 50 GbE RX PCS 5.1.6. Flow Control
5.1.1. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP TX MAC Datapath x
5.1.1.1. Frame Padding 5.1.1.2. Preamble Insertion 5.1.1.3. Inter-Packet Gap Generation and Insertion 5.1.1.4. Frame Check Sequence (CRC32) Insertion
5.1.3. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP Core RX MAC Datapath x
5.1.3.1. IP Core Preamble Processing 5.1.3.2. IP Core Malformed Packet Handling 5.1.3.3. Length/Type Field Processing
5.1.3.3. Length/Type Field Processing x
5.1.3.3.1. Length Checking 5.1.3.3.2. RX CRC Checking and Dynamic Forwarding
5.1.6. Flow Control x
5.1.6.1. TX Pause/PFC Flow Control Frame Transmission Request 5.1.6.2. XON/XOFF Pause Frames
5.2. User Interface to Ethernet Transmission x
5.2.1. Order of Transmission 5.2.2. Bit Order For TX and RX Datapaths
7. Interfaces and Signal Descriptions x
7.1. TX MAC Interface to User Logic 7.2. RX MAC Interface to User Logic 7.3. Transceivers 7.4. Transceiver Reconfiguration Signals 7.5. Avalon® Memory-Mapped Management Interface 7.6. Miscellaneous Status and Debug Signals 7.7. Flow Control Signals 7.8. Clock Signals 7.9. Reset Signals
8. Control, Status, and Statistics Register Descriptions x
8.1. TX MAC Registers 8.2. RX MAC Registers 8.3. Pause/PFC Flow Control Registers 8.4. Statistics Registers 8.5. Hard IP Registers
8.4. Statistics Registers x
8.4.1. Statistics Registers
1. About the F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP User Guide
2. About this IP
3. Getting Started
4. F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP Parameters
5. Functional Description
6. Reset
7. Interfaces and Signal Descriptions
8. Control, Status, and Statistics Register Descriptions
9. Document Revision History for the F-Tile Low Latency 50G Ethernet Intel FPGA Soft-IP User Guide

5.1.1. F-tile 50G Ethernet Intel FPGA IP TX MAC Datapath

The TX MAC module receives the client payload data with the destination and source addresses. It then adds, appends, or updates various header fields in accordance with the configuration specified. The MAC does not modify the destination address, the source address, or the payload received from the client. However, the TX MAC module adds a preamble, if the IP core is not configured to receive the preamble from user logic. It pads the payload of frames greater than eight bytes to satisfy the minimum Ethernet frame payload of 46 bytes. By default, the MAC inserts the CRC bytes. The TX MAC module inserts IDLE bytes to maintain an average IPG of 12.

Figure 8. Typical Client Frame at the Transmit InterfaceIllustrates the changes that the TX MAC makes to the client frame. This figure uses the following notational conventions:
  • <p> = payload size, which is arbitrarily large
  • <s> = number of padding bytes (0–46)
  • <g> = number of IPG bytes
Figure 9. TX MAC Functions

Section Content
Frame Padding
Preamble Insertion
Inter-Packet Gap Generation and Insertion
Frame Check Sequence (CRC32) Insertion

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