Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide: Agilex™ 5 FPGAs and SoCs

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ID 813663
Date 4/01/2024
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Document Table of Contents
Document Table of Contents x
1. Low Latency Ethernet 10G MAC Intel® FPGA IP Overview 2. Getting Started 3. Functional Description 4. Parameter Settings for the Low Latency Ethernet 10G MAC Intel® FPGA IP Core 5. Interface Signals 6. Configuration Registers 7. Document Revision History for the Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide: Agilex™ 5 FPGAs and SoCs
1. Low Latency Ethernet 10G MAC Intel® FPGA IP Overview x
1.1. Features 1.2. Release Information 1.3. Low Latency Ethernet 10G MAC Operating Modes 1.4. Device Family Support 1.5. Performance and Resource Utilization
1.5. Performance and Resource Utilization x
1.5.1. Resource Utilization 1.5.2. TX and RX Latency
2. Getting Started x
2.1. Introduction to Intel® FPGA IP Cores 2.2. Installing and Licensing Intel® FPGA IP Cores 2.3. Specifying the IP Core Parameters and Options ( Quartus® Prime Pro Edition) 2.4. Generated File Structure 2.5. Simulating Intel® FPGA IP Cores 2.6. Upgrading the Low Latency Ethernet 10G MAC Intel® FPGA IP Core 2.7. Low Latency Ethernet 10G MAC Intel® FPGA IP Design Examples
2.6. Upgrading the Low Latency Ethernet 10G MAC Intel® FPGA IP Core x
2.6.1. Design Considerations
2.6.1. Design Considerations x
2.6.1.1. Timing Constraints
2.6.1.1. Timing Constraints x
2.6.1.1.1. Pseudo-Static CSR Fields 2.6.1.1.2. Clock Crosser 2.6.1.1.3. Dual Clock FIFO
2.7. Low Latency Ethernet 10G MAC Intel® FPGA IP Design Examples x
2.7.1. Low Latency Ethernet 10G MAC Intel® FPGA IP Design Example for Agilex™ 5 Devices
3. Functional Description x
3.1. Architecture 3.2. Interfaces 3.3. Frame Types 3.4. TX Datapath 3.5. RX Datapath 3.6. Flow Control 3.7. Reset Requirements 3.8. XGMII Error Handling (Link Fault) 3.9. IEEE 1588v2
3.4. TX Datapath x
3.4.1. Padding Bytes Insertion 3.4.2. Address Insertion 3.4.3. CRC-32 Insertion 3.4.4. XGMII Encapsulation 3.4.5. Inter-Packet Gap Generation and Insertion 3.4.6. XGMII Transmission 3.4.7. TX Promiscuous (Transparent) Mode 3.4.8. TX Timing Diagrams
3.5. RX Datapath x
3.5.1. XGMII Decapsulation 3.5.2. CRC Checking 3.5.3. Address Checking 3.5.4. Frame Type Checking 3.5.5. Length Checking 3.5.6. CRC and Padding Bytes Removal 3.5.7. Overflow Handling 3.5.8. RX Promiscuous (Transparent) Mode 3.5.9. RX Timing Diagrams
3.5.5. Length Checking x
3.5.5.1. Frame Length 3.5.5.2. Payload Length
3.6. Flow Control x
3.6.1. IEEE 802.3 Flow Control 3.6.2. Priority-Based Flow Control
3.6.1. IEEE 802.3 Flow Control x
3.6.1.1. Pause Frame Reception 3.6.1.2. Pause Frame Transmission
3.6.2. Priority-Based Flow Control x
3.6.2.1. PFC Frame Reception 3.6.2.2. PFC Frame Transmission
3.9. IEEE 1588v2 x
3.9.1. Architecture 3.9.2. TX Datapath 3.9.3. RX Datapath 3.9.4. Frame Format
3.9.4. Frame Format x
3.9.4.1. PTP Packet in IEEE 802.3 3.9.4.2. PTP Packet over UDP/IPv4 3.9.4.3. PTP Packet over UDP/IPv6
5. Interface Signals x
5.1. Clock and Reset Signals 5.2. Speed Selection Signal 5.3. Error Correction Signals 5.4. Avalon® Memory-Mapped Interface Programming Signals 5.5. Avalon® Streaming Data Interfaces 5.6. Avalon® Streaming Flow Control Signals 5.7. Avalon® Streaming Status Interface 5.8. PHY-side Interfaces 5.9. IEEE 1588v2 Interfaces
5.5. Avalon® Streaming Data Interfaces x
5.5.1. Avalon® Streaming TX Data Interface Signals 5.5.2. Avalon® Streaming RX Data Interface Signals 5.5.3. Avalon® Streaming Data Interface Clocks
5.7. Avalon® Streaming Status Interface x
5.7.1. Avalon® Streaming Interface TX Status Signals 5.7.2. Avalon® Streaming Interface RX Status Signals
5.8. PHY-side Interfaces x
5.8.1. XGMII TX Signals 5.8.2. XGMII RX Signals 5.8.3. GMII TX Signals 5.8.4. GMII RX Signals 5.8.5. Clock Enable Signals
5.9. IEEE 1588v2 Interfaces x
5.9.1. IEEE 1588v2 Egress TX Signals 5.9.2. IEEE 1588v2 Ingress RX Signals 5.9.3. IEEE 1588v2 Interface Clocks
6. Configuration Registers x
6.1. Register Map 6.2. Register Access Definition 6.3. Primary MAC Address 6.4. MAC Reset Control Register 6.5. TX Configuration and Status Registers 6.6. Flow Control Registers 6.7. RX Configuration and Status Registers 6.8. ECC Registers 6.9. Statistics Registers 6.10. Timestamp Registers
6.10. Timestamp Registers x
6.10.1. Calculating PHY Total Latency 6.10.2. Calculating Deterministic Latency 6.10.3. PTP Register Configuration
1. Low Latency Ethernet 10G MAC Intel® FPGA IP Overview
2. Getting Started
3. Functional Description
4. Parameter Settings for the Low Latency Ethernet 10G MAC Intel® FPGA IP Core
5. Interface Signals
6. Configuration Registers
7. Document Revision History for the Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide: Agilex™ 5 FPGAs and SoCs

3.6.1.1. Pause Frame Reception

When the MAC receives an XOFF pause frame, it stops transmitting frames to the remote partner for a period equal to the pause quanta field of the pause frame. If the MAC receives a pause frame in the middle of a frame transmission, the MAC finishes sending the current frame and then suspends transmission for a period specified by the pause quanta. The MAC resumes transmission when it receives an XON pause frame or when the timer expires. The pause quanta received overrides any counter currently stored. When the remote partner sends more than one pause quanta, the MAC sets the value of the pause to the last quanta it received from the remote partner. You have the option to configure the MAC to ignore pause frames and continue transmitting frames by setting the IGNORE_PAUSE bit in the rx_frame_control register to 1.

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