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

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ID 758946
Date 4/03/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the F-Tile Low Latency 50G Ethernet Intel® FPGA IP User Guide 2. About this IP 3. Getting Started 4. F-Tile Low Latency 50G Ethernet Intel® FPGA 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 IP User Guide
2. About this IP x
2.1. Release Information 2.2. Features 2.3. Device Family Support 2.4. Performance and Resource Utilization
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IPs 3.2. Specifying the IP Parameters and Options 3.3. Simulating the IP 3.4. Generated File Structure 3.5. Integrating Your IP in Your Design 3.6. Compiling the Full Design and Programming the FPGA
3.1. Installing and Licensing Intel® FPGA IPs x
3.1.1. Intel® FPGA IP Evaluation Mode
3.5. Integrating Your IP 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
5. Functional Description x
5.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Functional Description 5.2. User Interface to Ethernet Transmission
5.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Functional Description x
5.1.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP TX MAC Datapath 5.1.2. 50 GbE TX PCS 5.1.3. F-Tile Low Latency 50G Ethernet Intel® FPGA IP 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 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 IP RX MAC Datapath x
5.1.3.1. IP Preamble Processing 5.1.3.2. IP 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 IP User Guide
2. About this IP
3. Getting Started
4. F-Tile Low Latency 50G Ethernet Intel® FPGA 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 IP User Guide

5.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Functional Description

The F-Tile Low Latency 50G Ethernet Intel® FPGA IP implements an Ethernet MAC in accordance with the 25G & 50G Ethernet Specification. The IP implements an Ethernet PCS and PMA (PHY) that handles the frame encapsulation and flow of data between a client logic and Ethernet network.

Figure 7.  F-Tile Low Latency 50G Ethernet Intel® FPGA IP with MAC, PCS, and PMA Clock Diagram

In the TX direction, the MAC assembles packets and sends them to the PHY. It completes the following tasks:

  • Accepts client frames.
  • Inserts the inter-packet gap (IPG), preamble, start of frame delimiter (SFD), and padding. The source of the preamble and SFD depends on whether the IP is in preamble-pass-through mode.
  • Adds the CRC bits if enabled.
  • Updates statistics counters if enabled.

The PCS encodes MAC frames. The PHY performs reliable transmission over the media to the remote end. The PCS and PMA blocks are implemented based on the F-Tile Ethernet Hard IP.

In the RX direction, the PMA, if selected, passes frames to the PCS that sends them to the MAC. The MAC completes the following tasks:

  • Performs CRC and malformed packet checks.
  • Updates statistics counters if enabled.
  • Strips out the CRC, preamble, and SFD.
  • Passes the remainder of the frame to the client.

In preamble pass-through mode, the MAC passes on the preamble and SFD to the client instead of stripping them out. In RX CRC pass-through mode, the MAC passes on the CRC bytes to the client and asserts the end-of-packet signal in the same clock cycle as the final CRC byte.


Section Content
F-Tile Low Latency 50G Ethernet Intel FPGA IP TX MAC Datapath
50 GbE TX PCS
F-Tile Low Latency 50G Ethernet Intel FPGA IP RX MAC Datapath
Link Fault Signaling Interface
50 GbE RX PCS
Flow Control

Level Two Title