Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide

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ID 683486
Date 4/09/2024
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Document Table of Contents
Document Table of Contents x
1. About the Low Latency E-Tile 40G Ethernet Intel® FPGA IP 2. Low Latency E-Tile 40G Ethernet IP Core Parameters 3. Getting Started 4. Functional Description 5. Reset 6. Interfaces and Signal Descriptions 7. Control, Status, and Statistics Register Descriptions 8. Debugging the Link 9. Ethernet Toolkit Overview 10. Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide Archives 11. Comparison Between Low Latency E-Tile 40G Ethernet Core and Low Latency 40GbE IP Core 12. Document Revision History for Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide
1. About the Low Latency E-Tile 40G Ethernet Intel® FPGA IP x
1.1. Release Information 1.2. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Supported Features 1.3. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Device Family and Speed Grade Support 1.4. Resource Utilization
1.3. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Device Family and Speed Grade Support x
1.3.1. Device Family Support 1.3.2. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Device Speed Grade Support
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IP Cores 3.2. Specifying the Low Latency E-Tile 40G Ethernet 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. Low Latency E-Tile 40G Ethernet IP Core Testbench 3.7. Compiling the Full Design and Programming the FPGA
3.5. Integrating Your IP Core in Your Design x
3.5.1. Pin Assignments 3.5.2. Ethernet Adaptation Flow 3.5.3. Placement Settings for the Low Latency E-Tile 40G Ethernet Core
3.6. Low Latency E-Tile 40G Ethernet IP Core Testbench x
3.6.1. Understanding the Testbench Behavior
4. Functional Description x
4.1. Low Latency E-Tile 40G Ethernet Core Functional Description 4.2. User Interface to Ethernet Transmission
4.1. Low Latency E-Tile 40G Ethernet Core Functional Description x
4.1.1. Low Latency E-Tile 40G Ethernet Core TX MAC Datapath 4.1.2. Low Latency E-Tile 40G Ethernet Core RX MAC Datapath 4.1.3. Link Fault Signaling Interface 4.1.4. Flow Control
4.1.1. Low Latency E-Tile 40G Ethernet Core TX MAC Datapath x
4.1.1.1. Frame Padding 4.1.1.2. Preamble Insertion 4.1.1.3. Inter-Packet Gap Generation and Insertion 4.1.1.4. Frame Check Sequence (CRC-32) Insertion
4.1.2. Low Latency E-Tile 40G Ethernet Core RX MAC Datapath x
4.1.2.1. IP Core Preamble Processing 4.1.2.2. IP Core Strict SFD Checking 4.1.2.3. Length/Type Field Processing 4.1.2.4. RX CRC Checking and Dynamic Forwarding
4.1.2.3. Length/Type Field Processing x
4.1.2.3.1. Length Checking
4.1.4. Flow Control x
4.1.4.1. TX Pause/PFC Flow Control Transmission 4.1.4.2. XON/XOFF Pause Frames
4.2. User Interface to Ethernet Transmission x
4.2.1. Order of Transmission 4.2.2. Bit Order For TX and RX Datapaths
6. Interfaces and Signal Descriptions x
6.1. TX MAC Interface to User Logic 6.2. RX MAC Interface to User Logic 6.3. Transceivers Signals 6.4. Transceiver Reconfiguration Signals 6.5. Avalon® Memory-Mapped Management Interface 6.6. Miscellaneous Status and Debug Signals 6.7. Reset Signals 6.8. Clocks 6.9. Flow Control Interface
7. Control, Status, and Statistics Register Descriptions x
7.1. PHY Registers 7.2. TX MAC Registers 7.3. RX MAC Registers 7.4. Pause/PFC Flow Control Registers
9. Ethernet Toolkit Overview x
9.1. Features
1. About the Low Latency E-Tile 40G Ethernet Intel® FPGA IP
2. Low Latency E-Tile 40G Ethernet IP Core Parameters
3. Getting Started
4. Functional Description
5. Reset
6. Interfaces and Signal Descriptions
7. Control, Status, and Statistics Register Descriptions
8. Debugging the Link
9. Ethernet Toolkit Overview
10. Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide Archives
11. Comparison Between Low Latency E-Tile 40G Ethernet Core and Low Latency 40GbE IP Core
12. Document Revision History for Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide

4.1.2.2. IP Core Strict SFD Checking

The Low Latency E-Tile 40G Ethernet core RX MAC checks all incoming packets for a correct Start byte (0xFB). If you turn on Enable Strict SFD check in the Low Latency E-Tile 40G Ethernet parameter editor, you enable the RX MAC to check the incoming preamble and SFD for the following values:

  • SFD = 0xD5
  • Preamble = 0x555555555555

The RX MAC checks one or both of these values depending on the values in bits [4:3] of the RXMAC_CONTROL register at offset 0x50A.

Table 11.  Strict SFD Checking Configuration
Enable Strict SFD check 0x50A[4]: Preamble Check 0x50A[3]: SFD Check Fields Checked Behavior if Check Fails
Off Don't Care Don't Care Start byte IP core does not recognize a malformed Start byte as a Start byte
On 0 0 Start byte
0 1 Start byte and SFD IP Core drops the packet
1 0 Start byte and preamble
1 1 Start byte and preamble and SFD
Level Two Title