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

6.6. Flow Control Registers

Table 37.  Flow Control Registers
Word Offset Register Name Description Access HW Reset Value
0x0040 tx_pauseframe_control
  • Bits 1:0—configures the transmission of pause frames.

    00: No pause frame transmission.

    01: Trigger the transmission of an XON pause frame (pause quanta = 0), if the transmission is not disabled by other conditions.

    10: Trigger the transmission of an XOFF pause frame (pause quanta = tx_pauseframe_quanta register), if the transmission is not disabled by other conditions.

    11: Reserved. This setting does not trigger any action.

  • Bits 31:2—reserved.

Changes to this self-clearing register affects the next transmission of a pause frame.

 RW 0x0
0x0042 tx_pauseframe_quanta
  • Bits 15:0—pause quanta in unit of quanta, 1 unit = 512 bits time. The MAC IP core uses this value when it generates XOFF pause frames. An XOFF pause frame with a quanta value of 0 is equivalent to an XON frame.
  • Bits 31:16—reserved.

Configure this register before you enable the MAC IP core for operations.

RW 0x0
0x0043 tx_pauseframe_holdoff_quanta
  • Bits 15:0—specifies the gap between two consecutive transmissions of XOFF pause frames in unit of quanta, 1 unit = 512 bits time. The gap prevents back-to-back transmissions of pause frames, which may affect the transmission of data frames.
  • Bits 31:16—reserved.

Configure this register before you enable the MAC IP core for operations.

RW 0x1
0x0044 tx_pauseframe_enable
  • Bit 0—configures the transmission of pause frames. This bit affects pause frame requests from both register and vector settings.

    0: Disables pause frame transmission.

    1: Enables pause frame transmission, if TX path is enabled by tx_packet_control.

  • Bits 2:1—specifies the trigger for pause frame requests.

    00: Accepts pause frame requests only from vector setting, avalon_st_pause_data.

    01: Accepts pause frame requests only from register setting, tx_pauseframe_control.

    10 / 11: Reserved.

  • Bits 31:3—reserved.

Configure this register before you enable the MAC IP core for operations.

RW 0x1
0x0046 tx_pfc_priority_enable 4 Enables priority-based flow control on the TX datapath.
  • Bits 7:0—setting bit n enables priority-based flow control for priority queue n. For example, setting tx_pfc_priority_enable[0] enables queue 0.
  • Bits 31:8—reserved.

Configure this register before you enable the MAC IP core for operations.

 RW 0x0
0x0048 pfc_pause_quanta_0 4 Specifies the pause quanta for each priority queue.
  • Bits 15:0—pfc_pause_quanta_n[15:0] specifies the pause length for priority queue n in quanta unit, where 1 unit = 512 bits time.
  • Bits 31:16—reserved.

Configure these registers before you enable the MAC IP core for operations.

RW 0x0
0x0049 pfc_pause_quanta_1 4
0x004A pfc_pause_quanta_2 4
0x004B pfc_pause_quanta_3 4
0x004C pfc_pause_quanta_4 4
0x004D pfc_pause_quanta_5 4
0x004E pfc_pause_quanta_6 4
0x004F pfc_pause_quanta_7 4
0x0058 pfc_holdoff_quanta_0 4 Specifies the gap between two consecutive transmissions of XOFF pause frames in unit of quanta, 1 unit = 512 bits time. The gap prevents back-to-back transmissions of pause frames, which may affect the transmission of data frames.
  • Bits 15:0— pfc_holdoff_quanta_n[15:0] specifies the gap for priority queue n.
  • Bits 31:16—reserved.

Configure these registers before you enable the MAC IP core for operations.

RW 0x1
0x0059 pfc_holdoff_quanta_1 4
0x005A pfc_holdoff_quanta_2 4
0x005B pfc_holdoff_quanta_3 4
0x005C pfc_holdoff_quanta_4 4
0x005D pfc_holdoff_quanta_5 4
0x005E pfc_holdoff_quanta_6 4
0x005F pfc_holdoff_quanta_7 4
4 This register is used only when you turn on the Enable preamble pass-through mode option. It is reserved when not used.
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