F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide

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ID 720985
Date 4/01/2022
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Document Table of Contents
Document Table of Contents x
1. About the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide 2. Low Latency Ethernet 10G MAC Intel® FPGA IP Overview 3. Getting Started 4. Functional Description 5. Low Latency Ethernet 10G MAC Intel® FPGA IP Parameters 6. Interface Signals 7. Configuration Registers 8. Document Revision History for the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide
2. Low Latency Ethernet 10G MAC Intel® FPGA IP Overview x
2.1. Release Information 2.2. Features 2.3. Low Latency Ethernet 10G MAC Operating Modes 2.4. Device Family Support 2.5. Performance and Resource Utilization
2.5. Performance and Resource Utilization x
2.5.1. Resource Utilization 2.5.2. TX and RX Latency
3. Getting Started x
3.1. Introduction to Intel® FPGA IP Cores 3.2. Installing and Licensing Intel® FPGA IP Cores 3.3. Specifying the IP Core Parameters and Options ( Intel® Quartus® Prime Pro Edition) 3.4. Generated File Structure 3.5. Simulating Intel® FPGA IP Cores 3.6. Upgrading the Low Latency Ethernet 10G MAC Intel® FPGA IP Core 3.7. Low Latency Ethernet 10G MAC Intel® FPGA IP Design Examples
3.6. Upgrading the Low Latency Ethernet 10G MAC Intel® FPGA IP Core x
3.6.1. Designing Considerations for the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP
3.6.1. Designing Considerations for the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP x
3.6.1.1. Timing Constraints
3.6.1.1. Timing Constraints x
3.6.1.1.1. Pseudo-Static CSR Fields 3.6.1.1.2. Clock Crosser 3.6.1.1.3. Dual Clock FIFO
3.7. Low Latency Ethernet 10G MAC Intel® FPGA IP Design Examples x
3.7.1. Low Latency Ethernet 10G MAC Intel® FPGA IP Design Example for Intel® Agilex™ Devices
4. Functional Description x
4.1. Architecture 4.2. Interfaces 4.3. Frame Types 4.4. TX Datapath 4.5. RX Datapath 4.6. Flow Control 4.7. Reset Requirements 4.8. Supported PHYs 4.9. XGMII Error Handling (Link Fault)
4.4. TX Datapath x
4.4.1. Padding Bytes Insertion 4.4.2. Address Insertion 4.4.3. CRC-32 Insertion 4.4.4. XGMII Encapsulation 4.4.5. Inter-Packet Gap Generation and Insertion 4.4.6. XGMII Transmission 4.4.7. TX Promiscuous (Transparent) Mode 4.4.8. TX Timing Diagrams
4.4.4. XGMII Encapsulation x
4.4.4.1. Transmit Path
4.5. RX Datapath x
4.5.1. XGMII Decapsulation 4.5.2. CRC Checking 4.5.3. Address Checking 4.5.4. Frame Type Checking 4.5.5. CRC and Padding Bytes Removal 4.5.6. Frame Length Checking 4.5.7. Overflow Handling 4.5.8. RX Promiscuous (Transparent) Mode 4.5.9. RX Timing Diagrams
4.5.3. Address Checking x
4.5.3.1. Unicast Frame Filtering 4.5.3.2. Multicast Frame Filtering
4.5.4. Frame Type Checking x
4.5.4.1. Malformed RX Packets 4.5.4.2. CRC Error 4.5.4.3. Address Check Error
4.5.6. Frame Length Checking x
4.5.6.1. Frame Length 4.5.6.2. Payload Length
4.6. Flow Control x
4.6.1. IEEE 802.3 Flow Control
4.6.1. IEEE 802.3 Flow Control x
4.6.1.1. Pause Frame Reception 4.6.1.2. Pause Frame Transmission
6. Interface Signals x
6.1. Clock and Reset Signals 6.2. Speed Selection Signal 6.3. Error Correction Signals 6.4. Avalon® Memory-Mapped Interface Programming Signals 6.5. Avalon® Streaming Data Interfaces 6.6. Avalon® Streaming Flow Control Signals 6.7. Avalon® Streaming Status Interface 6.8. PHY-side Interfaces
6.5. Avalon® Streaming Data Interfaces x
6.5.1. Avalon® Streaming TX Data Interface Signals 6.5.2. Avalon® Streaming RX Data Interface Signals 6.5.3. Avalon® Streaming Data Interface Clocks
6.7. Avalon® Streaming Status Interface x
6.7.1. Avalon® Streaming Interface TX Status Signals 6.7.2. Avalon® Streaming Interface RX Status Signals
6.8. PHY-side Interfaces x
6.8.1. XGMII TX Signals 6.8.2. XGMII RX Signals
7. Configuration Registers x
7.1. Register Map 7.2. Register Access Definition 7.3. Primary MAC Address 7.4. TX Configuration and Status Registers 7.5. Flow Control Registers 7.6. RX Configuration and Status Registers 7.7. ECC Registers 7.8. Statistics Registers
1. About the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide
2. Low Latency Ethernet 10G MAC Intel® FPGA IP Overview
3. Getting Started
4. Functional Description
5. Low Latency Ethernet 10G MAC Intel® FPGA IP Parameters
6. Interface Signals
7. Configuration Registers
8. Document Revision History for the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide

4.6.1.2. Pause Frame Transmission

Use one of the following methods to trigger pause frame transmission:

  • avalon_st_pause_data signal (tx_pauseframe_enable[2:1] set to 0)—You can connect this 2-bit signal to a FIFO buffer or a client. Bit setting:
    • avalon_st_pause_data[1]: 1—triggers the transmission of XOFF pause frames.
    • avalon_st_pause_data[0]: 1—triggers the transmission of XON pause frames. The transmission of XON pause frames only trigger for one time after XOFF pause frames regardless of how long the avalon_st_pause_data[0] signal is asserted.
    If pause frame transmission is triggered when the MAC is generating a pause frame, the MAC ignores the incoming request and completes the generation of the pause frame. Upon completion, if the avalon_st_pause_data signal remains asserted, the MAC generates a new pause frame and continues to do so until the signal is deasserted. You can also configure the gap between successive XOFF requests for using the tx_pauseframe_quanta register. XON pause frames will only be generated if the MAC generates XOFF pause frames.
  • tx_pauseframe_control register (tx_pauseframe_enable[2:0] set to 0x1)—A host (software) can set this register to trigger pause frames transmission. Setting tx_pauseframe_control[1] to 1 triggers the transmission of XOFF pause frames; setting tx_pauseframe_control[0] to 1 triggers the transmission of XON pause frames. The register clears itself after the request is executed.

You can configure the pause quanta in the tx_pauseframe_quanta register. The MAC sets the pause quanta field in XOFF pause frames to this register value.

Note: The new register field determines which pause interface takes effect.

The following figure shows the transmission of an XON pause frame. The MAC sets the destination address field to the global multicast address, 01-80-C2-00-00-01 (0x010000c28001) and the source address to the MAC primary address configured in the tx_addrins_macaddr0 and tx_addrins_madaddr1 registers.

Figure 20. XON Pause Frame Transmission


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