Low Latency 100-Gbps Ethernet IP Core User Guide

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ID 683160
Date 4/15/2021
Public
Document Table of Contents
Document Table of Contents x
1. About the LL 100GbE IP Core 2. Getting Started 3. Functional Description 4. Debugging the Link A. Additional Information
1. About the LL 100GbE IP Core x
1.1. LL 100GbE IP Core Supported Features 1.2. IP Core Device Family and Speed Grade Support 1.3. IP Core Verification 1.4. Performance and Resource Utilization 1.5. Release Information
1.2. IP Core Device Family and Speed Grade Support x
1.2.1. LL 100GbE IP Core Device Family Support 1.2.2. LL 100GbE IP Core Device Speed Grade Support
1.3. IP Core Verification x
1.3.1. Simulation Environment 1.3.2. Compilation Checking 1.3.3. Hardware Testing
1.4. Performance and Resource Utilization x
1.4.1. Arria 10 Resource Utilization 1.4.2. Stratix V Resource Utilization
2. Getting Started x
2.1. Installation and Licensing for LL 100GbE IP Core for Stratix® V Devices 2.2. Installing and Licensing Intel® FPGA IP Cores 2.3. Specifying the IP Core Parameters and Options 2.4. IP Core Parameters 2.5. Files Generated for Stratix V Variations 2.6. Files Generated for Arria 10 Variations 2.7. Integrating Your IP Core in Your Design 2.8. IP Core Testbenches 2.9. Compiling the Full Design and Programming the FPGA 2.10. Initializing the IP Core
2.2. Installing and Licensing Intel® FPGA IP Cores x
2.2.1. Intel® FPGA IP Evaluation Mode
2.7. Integrating Your IP Core in Your Design x
2.7.1. Pin Assignments 2.7.2. External Transceiver Reconfiguration Controller Required in Stratix V Designs 2.7.3. Transceiver PLL Required in Arria 10 Designs 2.7.4. Handling Potential Jitter in Intel® Arria® 10 Devices 2.7.5. External Time-of-Day Module for Variations with 1588 PTP Feature 2.7.6. External TX MAC PLL 2.7.7. Placement Settings for the LL 100GbE Core
2.8. IP Core Testbenches x
2.8.1. Testbench Behavior 2.8.2. Simulating the LL 100GbE IP Core With the Testbenches
2.8.2. Simulating the LL 100GbE IP Core With the Testbenches x
2.8.2.1. Generating the LL 100GbE Testbench 2.8.2.2. Optimizing the IP Core Simulation With the Testbenches 2.8.2.3. Simulating with the Modelsim Simulator 2.8.2.4. Simulating with the NCSim Simulator 2.8.2.5. Simulating with the VCS Simulator 2.8.2.6. Testbench Output Example
3. Functional Description x
3.1. High Level System Overview 3.2. LL 100GbE IP Core Functional Description 3.3. Signals 3.4. Software Interface: Registers 3.5. Ethernet Glossary
3.2. LL 100GbE IP Core Functional Description x
3.2.1. LL 100GbE IP Core TX Datapath 3.2.2. LL 100GbE IP Core TX Data Bus Interfaces 3.2.3. LL 100GbE IP Core RX Datapath 3.2.4. LL 100GbE IP Core RX Data Bus Interfaces 3.2.5. Low Latency 100GbE CAUI–4 PHY 3.2.6. External Reconfiguration Controller 3.2.7. External Transceiver PLL 3.2.8. External TX MAC PLL 3.2.9. Congestion and Flow Control Using Pause Frames 3.2.10. Pause Control and Generation Interface 3.2.11. Pause Control Frame Filtering 3.2.12. Link Fault Signaling Interface 3.2.13. Statistics Counters Interface 3.2.14. 1588 Precision Time Protocol Interfaces 3.2.15. PHY Status Interface 3.2.16. Transceiver PHY Serial Data Interface 3.2.17. Control and Status Interface 3.2.18. Arria 10 Transceiver Reconfiguration Interface 3.2.19. Clocks 3.2.20. Resets
3.2.1. LL 100GbE IP Core TX Datapath x
3.2.1.1. Preamble, Start, and SFD Insertion 3.2.1.2. Address Insertion 3.2.1.3. Length/Type Field Processing 3.2.1.4. Frame Padding 3.2.1.5. Frame Check Sequence (CRC-32) Insertion 3.2.1.6. Inter-Packet Gap Generation and Insertion 3.2.1.7. TX RSFEC 3.2.1.8. Error Insertion Test and Debug Feature
3.2.2. LL 100GbE IP Core TX Data Bus Interfaces x
3.2.2.1. LL 100GbE IP Core User Interface Data Bus 3.2.2.2. LL 100GbE IP Core TX Data Bus with Adapters (Avalon-ST Interface) 3.2.2.3. LL 100GbE IP Core TX Data Bus Without Adapters (Custom Streaming Interface) 3.2.2.4. Bus Quantization Effects With Adapters 3.2.2.5. User Interface to Ethernet Transmission
3.2.2.5. User Interface to Ethernet Transmission x
3.2.2.5.1. Order of Transmission
3.2.3. LL 100GbE IP Core RX Datapath x
3.2.3.1. LL 100GbE IP Core RX Filtering 3.2.3.2. LL 100GbE IP Core Preamble Processing 3.2.3.3. LL 100GbE IP Core FCS (CRC-32) Removal 3.2.3.4. LL 100GbE IP Core CRC Checking 3.2.3.5. LL 100GbE IP Core Malformed Packet Handling 3.2.3.6. RX CRC Forwarding 3.2.3.7. Inter-Packet Gap 3.2.3.8. RX RSFEC 3.2.3.9. Pause Ignore 3.2.3.10. Control Frame Identification
3.2.4. LL 100GbE IP Core RX Data Bus Interfaces x
3.2.4.1. LL 100GbE IP Core User Interface Data Bus 3.2.4.2. LL 100GbE IP Core RX Data Bus with Adapters (Avalon-ST Interface) 3.2.4.3. LL 100GbE IP Core RX Data Bus Without Adapters (Custom Streaming Interface)
3.2.9. Congestion and Flow Control Using Pause Frames x
3.2.9.1. Conditions Triggering XOFF Frame Transmission 3.2.9.2. Conditions Triggering XON Frame Transmission
3.2.13. Statistics Counters Interface x
3.2.13.1. OctetOK Count Interface
3.2.14. 1588 Precision Time Protocol Interfaces x
3.2.14.1. Implementing a 1588 System That Includes a LL 100GbE Core 3.2.14.2. PTP Receive Functionality 3.2.14.3. PTP Transmit Functionality 3.2.14.4. External Time-of-Day Module for 1588 PTP Variations 3.2.14.5. PTP Timestamp and TOD Formats 3.2.14.6. 1588 PTP Interface Signals
3.3. Signals x
3.3.1. LL 100GbE IP Core Signals
3.4. Software Interface: Registers x
3.4.1. LL 100GbE IP Core Registers 3.4.2. LL 100GbE Hardware Design Example Registers
3.4.1. LL 100GbE IP Core Registers x
3.4.1.1. PHY Registers 3.4.1.2. Link Fault Signaling Registers 3.4.1.3. LL 100GbE IP Core MAC Configuration Registers 3.4.1.4. Pause Registers 3.4.1.5. TX Statistics Registers 3.4.1.6. RX Statistics Registers 3.4.1.7. 1588 PTP Registers 3.4.1.8. TX Reed-Solomon FEC Registers 3.4.1.9. RX Reed-Solomon FEC Registers
3.4.2. LL 100GbE Hardware Design Example Registers x
3.4.2.1. Packet Client Registers
4. Debugging the Link x
4.1. Creating a Signal Tap Debug File to Match Your Design Hierarchy
A. Additional Information x
A.1. LL 100GbE IP Core User Guide Archives A.2. LL 100GbE IP Core User Guide Revision History
1. About the LL 100GbE IP Core
2. Getting Started
3. Functional Description
4. Debugging the Link
A. Additional Information

3.2.1. LL 100GbE IP Core TX Datapath

The TX MAC module receives the client payload data with the destination and source addresses and then adds, appends, or updates various header fields in accordance with the configuration specified. The MAC does not modify the destination address, the source address, or the payload received from the client. However, the TX MAC module adds a preamble (if the IP core is not configured to receive the preamble from user logic), pads the payload of frames greater than eight bytes to satisfy the minimum Ethernet frame payload of 46 bytes, and if you set Enable TX CRC insertion or turn on flow control, calculates the CRC over the entire MAC frame. (If padding is added, it is also included in the CRC calculation. If you turn off Enable TX CRC insertion, the client must provide the CRC bytes and must provide frames that have a minimum size of 64 bytes and therefore do not require padding). If you set Average interpacket gap to 8 or 12, the TX MAC module inserts IDLE bytes to maintain an average IPG. In addition, the TX MAC inserts an error in the Ethernet frame if the client requests to insert an error.

The LL 100GbE IP core does not process incoming frames of less than nine bytes correctly. You must ensure such frames do not reach the TX client interface.

Figure 10. Typical Client Frame at the Transmit InterfaceIllustrates the changes that the TX MAC makes to the client frame. This figure uses the following notational conventions:
  • <p> = payload size, which is arbitrarily large.
  • <s> = padding bytes = 0–46 bytes.
  • <g> = number of IPG bytes

The following sections describe the functions that the TX module performs:

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