Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP User Guide

Download PDF
ID 683221
Date 11/10/2022
Public
Document Table of Contents
Document Table of Contents x
1. About the Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP 2. Low Latency 40G for ASIC Proto 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 40G for ASIC Proto Ethernet Intel® FPGA IP User Guide Archives 11. Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP Revision History
1. About the Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP x
1.1. Low Latency 40G for ASIC Proto Ethernet IP Core Supported Features 1.2. Device Family Support 1.3. Low Latency 40G for ASIC Proto Ethernet IP Core Device Speed Grade Support 1.4. Resource Utilization 1.5. Release Information
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IP Cores 3.2. Specifying the Low Latency 40G for ASIC Proto 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 40G for ASIC Proto 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. Adding the Transceiver PLL 3.5.3. Adding the External TX MAC PLL 3.5.4. Placement Settings for the Low Latency 40G for ASIC Proto Ethernet Core
3.6. Low Latency 40G for ASIC Proto Ethernet IP Core Testbench x
3.6.1. Understanding the Testbench Behavior
4. Functional Description x
4.1. Low Latency 40G for ASIC Proto Ethernet Core Functional Description 4.2. User Interface to Ethernet Transmission
4.1. Low Latency 40G for ASIC Proto Ethernet Core Functional Description x
4.1.1. Low Latency 40G for ASIC Proto Ethernet Core TX MAC Datapath 4.1.2. Low Latency 40G for ASIC Proto Ethernet Core RX MAC Datapath 4.1.3. Link Fault Signaling Interface 4.1.4. Flow Control
4.1.1. Low Latency 40G for ASIC Proto 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
4.1.2. Low Latency 40G for ASIC Proto 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. TX PCS Interface to User Logic 6.4. RX PCS Interface to User Logic 6.5. Transceivers Signals 6.6. Transceiver Reconfiguration Signals 6.7. Avalon® Memory-Mapped Management Interface 6.8. Miscellaneous Status and Debug Signals 6.9. Reset Signals 6.10. Clocks 6.11. 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. Statistics Registers
7.4. Statistics Registers x
7.4.1. TX Statistics Registers 7.4.2. RX Statistics Registers
9. Ethernet Toolkit Overview x
9.1. Features
1. About the Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP
2. Low Latency 40G for ASIC Proto 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 40G for ASIC Proto Ethernet Intel® FPGA IP User Guide Archives
11. Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP Revision History

4.1.2.3. Length/Type Field Processing

This two-byte header represents either the length of the payload or the type of MAC frame.
  • Length/type >= 0x600—The field represents the frame type. The following frame types are possible:
    • Length/type = 0x8100—VLAN or stacked VLAN tagged frames. The MAC RX continues to check the frame and payload lengths.
    • Length/type = 0x8808—Control frames. The next two bytes are the Opcode field that indicates the type of control frame. For pause frames (Opcode = 0x0001) and PFC frames (Opcode = 0x0101), the MAC RX proceeds with pause frame processing.
    • For other field values, the MAC RX forwards the receive frame to the client.

Section Content
Length Checking

Level Two Title