Low Latency 50G Ethernet Intel® FPGA IP User Guide: Stratix® 10 Devices

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ID 683675
Date 4/09/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the Low Latency 50G Ethernet IP Core 2. Getting Started 3. Low Latency 50G Ethernet Intel® FPGA IP Parameters 4. Functional Description 5. Interfaces and Signal Descriptions 6. IP Core Register Descriptions 7. Document Revision History for the Low Latency 50G Ethernet Intel® FPGA IP User Guide: Stratix® 10 Devices
1. About the Low Latency 50G Ethernet IP Core x
1.1. Release Information 1.2. Supported Features 1.3. Device Family Support 1.4. Device Speed Grade Support 1.5. IP Core Verification 1.6. Performance and Resource Utilization
1.5. IP Core Verification x
1.5.1. Simulation Environment 1.5.2. Compilation Checking 1.5.3. Hardware Testing
2. Getting Started x
2.1. Installing and Licensing Intel® FPGA IP Cores 2.2. Specifying the Low Latency 50G Ethernet IP Core Parameters and Options 2.3. Simulating the IP Core 2.4. Generated File Structure 2.5. Integrating Your IP Core in Your Design 2.6. Compiling the Full Design and Programming the FPGA
2.1. Installing and Licensing Intel® FPGA IP Cores x
2.1.1. Intel® FPGA IP Evaluation Mode
2.5. Integrating Your IP Core in Your Design x
2.5.1. Pin Assignments 2.5.2. Adding the Transceiver PLL 2.5.3. Placement Settings for the Low Latency 50G Ethernet IP Core
4. Functional Description x
4.1. TX MAC Datapath 4.2. TX PCS 4.3. RX MAC Datapath 4.4. RX PCS 4.5. Link Fault Signaling Interface 4.6. User Interface to Ethernet Transmission 4.7. Auto Negotiation and Link Training 4.8. Flow Control 4.9. Reset
4.1. TX MAC Datapath x
4.1.1. Frame Padding 4.1.2. Preamble Insertion 4.1.3. Inter-Packet Gap Generation and Insertion
4.3. RX MAC Datapath x
4.3.1. IP Core Preamble Processing 4.3.2. IP Core Strict SFD Checking 4.3.3. IP Core Malformed Packet Handling 4.3.4. Length/Type Field Processing 4.3.5. RX CRC Checking and Dynamic Forwarding
4.3.4. Length/Type Field Processing x
4.3.4.1. Length Checking
4.6. User Interface to Ethernet Transmission x
4.6.1. Order of Transmission 4.6.2. Bit Order For TX and RX Datapaths
4.8. Flow Control x
4.8.1. TX Pause/PFC Flow Control Transmission 4.8.2. XON/XOFF Pause Frames
5. Interfaces and Signal Descriptions x
5.1. TX MAC Interface to User Logic 5.2. RX MAC Interface to User Logic 5.3. Transceivers 5.4. Transceiver Reconfiguration Signals 5.5. Avalon® Memory-Mapped Management Interface 5.6. Miscellaneous Status and Debug Signals 5.7. Reset Signals 5.8. Flow Control Interface
5.4. Transceiver Reconfiguration Signals x
5.4.1. Disabling Background Calibration
6. IP Core Register Descriptions x
6.1. PHY Registers 6.2. TX MAC Registers 6.3. RX MAC Registers 6.4. Flow Control Registers 6.5. Statistics Registers 6.6. Auto-Negotiation and Link Training Registers
6.5. Statistics Registers x
6.5.1. TX Statistics Registers 6.5.2. RX Statistics Registers
6.6. Auto-Negotiation and Link Training Registers x
6.6.1. AN/LT Sequencer Config 6.6.2. AN/LT Sequencer Status 6.6.3. Auto Negotiation Config Register 1 6.6.4. Auto Negotiation Config Register 2 6.6.5. Auto Negotiation Status Register 6.6.6. Auto Negotiation Config Register 3 6.6.7. Auto Negotiation Config Register 4 6.6.8. Auto Negotiation Config Register 5 6.6.9. Auto Negotiation Config Register 6 6.6.10. Auto Negotiation Status Register 1 6.6.11. Auto Negotiation Status Register 2 6.6.12. Auto Negotiation Status Register 3 6.6.13. Auto Negotiation Status Register 4 6.6.14. Auto Negotiation Status Register 5 6.6.15. Link Training Config Register 1 6.6.16. Link Training Config Register 2 6.6.17. Link Training Status Register 1 6.6.18. Link Training Config Register for Lane 0 6.6.19. Link Training Frame Contents for Lane 0 6.6.20. Local Transceiver TX EQ 1 Settings for Lane 0 6.6.21. Local Transceiver TX EQ 2 Settings for Lane 0 6.6.22. Local Link Training Parameters 6.6.23. Link Training Config Register for Lane 1 6.6.24. Link Training Frame Contents for Lane 1 6.6.25. Local Transceiver TX EQ 1 Settings for Lane 1 6.6.26. Local Transceiver TX EQ 2 Settings for Lane 1 6.6.27. Link Training Config Register for Lane 2 6.6.28. Link Training Frame Contents for Lane 2 6.6.29. Local Transceiver TX EQ 1 Settings for Lane 2 6.6.30. Local Transceiver TX EQ 2 Settings for Lane 2 6.6.31. Link Training Config Register for Lane 3 6.6.32. Link Training Frame Contents for Lane 3 6.6.33. Local Transceiver TX EQ 1 Settings for Lane 3 6.6.34. Local Transceiver TX EQ 2 Settings for Lane 3
1. About the Low Latency 50G Ethernet IP Core
2. Getting Started
3. Low Latency 50G Ethernet Intel® FPGA IP Parameters
4. Functional Description
5. Interfaces and Signal Descriptions
6. IP Core Register Descriptions
7. Document Revision History for the Low Latency 50G Ethernet Intel® FPGA IP User Guide: Stratix® 10 Devices

4.3.2. IP Core Strict SFD Checking

The Low Latency 50G Ethernet IP 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 50G Ethernet IP 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 10.  Strict SFD Checking Configuration
Parameter: 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