Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide

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ID 683486
Date 4/09/2024
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Document Table of Contents
Document Table of Contents x
1. About the Low Latency E-Tile 40G Ethernet Intel® FPGA IP 2. Low Latency E-Tile 40G Ethernet IP Core Parameters 3. Getting Started 4. Functional Description 5. Reset 6. Interfaces and Signal Descriptions 7. Control, Status, and Statistics Register Descriptions 8. Debugging the Link 9. Ethernet Toolkit Overview 10. Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide Archives 11. Comparison Between Low Latency E-Tile 40G Ethernet Core and Low Latency 40GbE IP Core 12. Document Revision History for Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide
1. About the Low Latency E-Tile 40G Ethernet Intel® FPGA IP x
1.1. Release Information 1.2. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Supported Features 1.3. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Device Family and Speed Grade Support 1.4. Resource Utilization
1.3. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Device Family and Speed Grade Support x
1.3.1. Device Family Support 1.3.2. Low Latency E-Tile 40G Ethernet Intel® FPGA IP Device Speed Grade Support
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IP Cores 3.2. Specifying the Low Latency E-Tile 40G Ethernet IP Core Parameters and Options 3.3. Simulating the IP Core 3.4. Generated File Structure 3.5. Integrating Your IP Core in Your Design 3.6. Low Latency E-Tile 40G Ethernet IP Core Testbench 3.7. Compiling the Full Design and Programming the FPGA
3.5. Integrating Your IP Core in Your Design x
3.5.1. Pin Assignments 3.5.2. Ethernet Adaptation Flow 3.5.3. Placement Settings for the Low Latency E-Tile 40G Ethernet Core
3.6. Low Latency E-Tile 40G Ethernet IP Core Testbench x
3.6.1. Understanding the Testbench Behavior
4. Functional Description x
4.1. Low Latency E-Tile 40G Ethernet Core Functional Description 4.2. User Interface to Ethernet Transmission
4.1. Low Latency E-Tile 40G Ethernet Core Functional Description x
4.1.1. Low Latency E-Tile 40G Ethernet Core TX MAC Datapath 4.1.2. Low Latency E-Tile 40G Ethernet Core RX MAC Datapath 4.1.3. Link Fault Signaling Interface 4.1.4. Flow Control
4.1.1. Low Latency E-Tile 40G Ethernet Core TX MAC Datapath x
4.1.1.1. Frame Padding 4.1.1.2. Preamble Insertion 4.1.1.3. Inter-Packet Gap Generation and Insertion 4.1.1.4. Frame Check Sequence (CRC-32) Insertion
4.1.2. Low Latency E-Tile 40G Ethernet Core RX MAC Datapath x
4.1.2.1. IP Core Preamble Processing 4.1.2.2. IP Core Strict SFD Checking 4.1.2.3. Length/Type Field Processing 4.1.2.4. RX CRC Checking and Dynamic Forwarding
4.1.2.3. Length/Type Field Processing x
4.1.2.3.1. Length Checking
4.1.4. Flow Control x
4.1.4.1. TX Pause/PFC Flow Control Transmission 4.1.4.2. XON/XOFF Pause Frames
4.2. User Interface to Ethernet Transmission x
4.2.1. Order of Transmission 4.2.2. Bit Order For TX and RX Datapaths
6. Interfaces and Signal Descriptions x
6.1. TX MAC Interface to User Logic 6.2. RX MAC Interface to User Logic 6.3. Transceivers Signals 6.4. Transceiver Reconfiguration Signals 6.5. Avalon® Memory-Mapped Management Interface 6.6. Miscellaneous Status and Debug Signals 6.7. Reset Signals 6.8. Clocks 6.9. Flow Control Interface
7. Control, Status, and Statistics Register Descriptions x
7.1. PHY Registers 7.2. TX MAC Registers 7.3. RX MAC Registers 7.4. Pause/PFC Flow Control Registers
9. Ethernet Toolkit Overview x
9.1. Features
1. About the Low Latency E-Tile 40G Ethernet Intel® FPGA IP
2. Low Latency E-Tile 40G Ethernet IP Core Parameters
3. Getting Started
4. Functional Description
5. Reset
6. Interfaces and Signal Descriptions
7. Control, Status, and Statistics Register Descriptions
8. Debugging the Link
9. Ethernet Toolkit Overview
10. Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide Archives
11. Comparison Between Low Latency E-Tile 40G Ethernet Core and Low Latency 40GbE IP Core
12. Document Revision History for Low Latency E-Tile 40G Ethernet Intel® FPGA IP User Guide

6.7. Reset Signals

The IP core has three external hard reset inputs. These resets are asynchronous and are internally synchronized. Assert resets for ten cycles or until you observe the effect of their specific reset. Asserting the external hard reset csr_rst_n returns control and status registers to their original values. rx_pcs_ready and tx_lanes_stable are asserted when the IP core has exited reset successfully.
Table 19.   Reset Signals

Signal

Direction

Description

tx_rst_n Input Active low hard reset signal. Resets the TX interface, including the TX PCS and TX MAC. This reset leads to the deassertion of the tx_lanes_stable output signal.
rx_rst_n Input

Active low hard reset signal. Resets the RX interface, including the RX PCS and RX MAC. This reset leads to the deassertion of the rx_pcs_ready output signal.

csr_rst_n Input

Active low hard global reset. Resets the full IP core. Resets the TX MAC, RX MAC, TX PCS, RX PCS, transceivers, and registers. This reset leads to the deassertion of the tx_lanes_stable and rx_pcs_ready output signals.

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