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

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ID 720985
Date 4/18/2024
Public
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. F-Tile Low Latency Ethernet 10G MAC Intel FPGA IP User Guide Archives 9. 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 ( 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. Design Considerations
3.6.1. Design Considerations 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 Agilex™ 7 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) 4.10. IEEE 1588v2
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
4.10. IEEE 1588v2 x
4.10.1. Architecture 4.10.2. TX Datapath 4.10.3. RX Datapath 4.10.4. Frame Format
4.10.4. Frame Format x
4.10.4.1. PTP Packet in IEEE 802.3 4.10.4.2. PTP Packet over UDP/IPv4 4.10.4.3. PTP Packet over UDP/IPv6
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 6.9. IEEE 1588v2 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
6.9. IEEE 1588v2 Interfaces x
6.9.1. IEEE 1588v2 Egress TX Signals 6.9.2. IEEE 1588v2 Ingress RX Signals 6.9.3. IEEE 1588v2 Interface Clocks
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 7.9. Timestamp Registers
7.9. Timestamp Registers x
7.9.1. Calculating PHY Total Latency 7.9.2. Calculating Deterministic Latency 7.9.3. PTP Register Configuration
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. F-Tile Low Latency Ethernet 10G MAC Intel FPGA IP User Guide Archives
9. Document Revision History for the F-Tile Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide

7.9.2. Calculating Deterministic Latency

Note: Please refer to the configuration registers of Multirate PHY IP for more information on the registers used in the Deterministic Latency calculation.
Table 43.  Deterministic Latency Parameter Description
Item Value Description
sampling_clk_period

6.5ns

Period for sampling clock (latency_sclk) of 153.846 MHz

UI period

0.0969696..ns

Period for unit interval
bitslip_cnt Read from pcs_bitslip_cnt[6:0] Read from the Ethernet Reconfiguration Interface register (pcs_bitslip_cnt) at base 0x1000, register offset 0x110.
dlpulse_alignment Read from pcs_bitslip_cnt[7] Read from the Ethernet Reconfiguration Interface register (pcs_bitslip_cnt) at base 0x1000, register offset 0x110.
tx_delay (TxDL)

Read from PTP_DL_TX register

0x421[20:0]

TX delay value in sampling_clk cycles, fixed point format Q13.8.

Bit [20:8] is integer, bit [7:0] is fractional.

Example: tx_delay = 0x27F4,

Bit [20:8] = 0x27 = 39,

Bit [7:0] = 0xF4 = 244/2^8 = 0.953125,

Hence, tx_delay = 39.953125 clock cycles.

rx_delay (RxDL)

Read from PTP_DL_RX register

0x422[20:0]

RX delay value in sampling_clk cycles, fixed point format Q13.8.

Bit [20:8] is integer, bit [7:0] is fractional.
TX PMA Delay

Simulation: 80

Hardware: 79

TX PMA delay in the number of UI. Multiply by UI period to convert to nanoseconds and fractional nanoseconds format.
RX PMA Delay

Simulation: 88

Hardware: 88

RX PMA delay in the number of UI. Multiply by UI period to convert to nanoseconds and fractional nanoseconds format.
To calculate the TX and RX latency: 
TX Latency = TxDL * (sampling_clock_period in ns)
RX Latency = RxDL * (sampling_clock_period in ns) + (- bitslip_cnt - 33 * dlpulse_alignment) * (UI period in ns)
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