GTS Ethernet Intel® FPGA Hard IP User Guide

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ID 817676
Date 4/01/2024
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Document Table of Contents
Document Table of Contents x
1. Overview 2. Getting Started 3. GTS Ethernet Intel® FPGA Hard IP Parameters 4. Integrate GTS Ethernet Intel® FPGA Hard IP to the User Application 5. Functional Description 6. Configuration Registers 7. Document Revision History for the GTS Ethernet Intel® FPGA Hard IP User Guide
1. Overview x
1.1. Agilex™ 5 Ethernet Portfolio and Target Applications 1.2. Agilex™ 5 Ethernet Hard IP Features 1.3. High-Level Functional Overview 1.4. GTS Ethernet Intel® FPGA Hard IP Design Flow
1.2. Agilex™ 5 Ethernet Hard IP Features x
1.2.1. Device Family Support 1.2.2. Device Speed Grade Support 1.2.3. Resource Utilization 1.2.4. Round-Trip Latency 1.2.5. Release Information
2. Getting Started x
2.1. Installing and Licensing GTS Ethernet Intel® FPGA Hard IP Cores 2.2. Generate HDL for Synthesis and Simulation 2.3. Generated File Structure
4. Integrate GTS Ethernet Intel® FPGA Hard IP to the User Application x
4.1. Clocks 4.2. Resets 4.3. MAC Client Interface – Avalon® Streaming Interface 4.4. PCS Client Interface – MII PCS Only 4.5. PCS66 Client Interface – FlexE and OTN 4.6. Connect the Status Interface 4.7. Ethernet Hard IP Reconfiguration Interface 4.8. Precision Time Protocol Interface
4.1. Clocks x
4.1.1. MAC Synchronous Clock Connections to Single Instance 4.1.2. MAC Synchronous Clock Connections to Multiple Instances 4.1.3. Clock Connections to MAC Asynchronous Operation 4.1.4. Clock Connections in PTP-Based Synchronous Operation 4.1.5. Clock Connections in Synchronous Ethernet Operation (Sync-E) 4.1.6. I/O PLL as System PLL
4.2. Resets x
4.2.1. Reset Signals 4.2.2. Reset Sequence 4.2.3. Power Up Reset Sequence 4.2.4. TX Reset Entry Sequence 4.2.5. TX Reset Exit Sequence 4.2.6. RX Reset Entry Sequence 4.2.7. RX Reset Exit Sequence 4.2.8. Auto Recovery Reset Sequence 4.2.9. GTS Reset Sequencer Intel® FPGA IP
4.2.9. GTS Reset Sequencer Intel® FPGA IP x
4.2.9.1. Requirements and Considerations for GTS Reset Sequencer Intel® FPGA IP
4.3. MAC Client Interface – Avalon® Streaming Interface x
4.3.1. TX MAC Avalon Streaming Client Interface 4.3.2. RX MAC Avalon Streaming Client Interface 4.3.3. MAC Flow Control Interface
4.3.1. TX MAC Avalon Streaming Client Interface x
4.3.1.1. TX MAC Avalon Streaming Client Interface with Disabled Preamble Passthrough 4.3.1.2. TX MAC Avalon Streaming Client Interface with Enabled Preamble Passthrough 4.3.1.3. Control Source Address, PAD, and CRC Insertion 4.3.1.4. Assert the i_tx_error to Invalidate a Packet
4.3.2. RX MAC Avalon Streaming Client Interface x
4.3.2.1. RX MAC Avalon Streaming Client Interface with Disabled Preamble Passthrough 4.3.2.2. Enable Preamble Passthrough and RX CRC Forwarding 4.3.2.3. Monitor Status and Errors on the RX MAC Avalon Streaming Client Interface
4.3.3. MAC Flow Control Interface x
4.3.3.1. TX PAUSE and TX PFC Ports 4.3.3.2. Receiving PAUSE and PFC Frames
4.4. PCS Client Interface – MII PCS Only x
4.4.1. PCS Mode TX Interface 4.4.2. PCS Mode RX Interface
4.5. PCS66 Client Interface – FlexE and OTN x
4.5.1. FlexE and OTN Mode TX Interface 4.5.2. FlexE and OTN Mode RX Interface
4.6. Connect the Status Interface x
4.6.1. Status Interface
4.8. Precision Time Protocol Interface x
4.8.1. Time-of-Day Interface 4.8.2. TX 2-Step Timestamp Interface 4.8.3. TX 1-Step Timestamp Interface 4.8.4. RX Timestamp Interface 4.8.5. PTP Status Interface
4.8.3. TX 1-Step Timestamp Interface x
4.8.3.1. PTP Field Offset for 1-Step Operation
5. Functional Description x
5.1. Datapath Description 5.2. GTS Ethernet Intel® FPGA Hard IP MAC 5.3. PCS, OTN, and FlexE Modes 5.4. Precision Time Protocol Interface
5.2. GTS Ethernet Intel® FPGA Hard IP MAC x
5.2.1. MAC TX Datapath 5.2.2. MAC RX Datapath 5.2.3. Congestion and Flow Control Using PAUSE or Priority Flow Control (PFC) 5.2.4. Link Fault Signaling 5.2.5. Order of Ethernet Transmission:
5.2.1. MAC TX Datapath x
5.2.1.1. TX Preamble, Start, and SFD Insertion 5.2.1.2. Source Address Insertion 5.2.1.3. Length/Type Field Processing 5.2.1.4. Frame Padding 5.2.1.5. Frame Check Sequence (CRC-32) Insertion 5.2.1.6. Inter-Packet Gap Generation and Insertion
5.2.2. MAC RX Datapath x
5.2.2.1. RX Preamble Processing 5.2.2.2. RX Strict SFD Checking 5.2.2.3. RX FCS Checking 5.2.2.4. RX Malformed Packet Handling 5.2.2.5. Removing PAD Bytes and FCS Bytes from RX Frames 5.2.2.6. RX Undersized Frames, Oversized Frames, and Frames with Length Errors 5.2.2.7. Inter-Packet Gap
5.2.3. Congestion and Flow Control Using PAUSE or Priority Flow Control (PFC) x
5.2.3.1. Conditions Triggering XOFF Frame Transmission 5.2.3.2. Conditions Triggering XON Frame Transmission 5.2.3.3. Pause Control and Generation Interface 5.2.3.4. Pause Control Frame Filtering
5.3. PCS, OTN, and FlexE Modes x
5.3.1. PCS Mode 5.3.2. OTN Mode 5.3.3. FlexE Mode
5.4. Precision Time Protocol Interface x
5.4.1. Features 5.4.2. PTP User Flow 5.4.3. UI Adjustment 5.4.4. Reference Time Interval 5.4.5. Minimum and Maximum Reference Time (TAM) Interval for UI Measurement (Hardware)
5.4.2. PTP User Flow x
5.4.2.1. PTP TX User Flow 5.4.2.2. PTP RX User Flow
5.4.3. UI Adjustment x
5.4.3.1. TX UI Adjustment 5.4.3.2. RX UI Adjustment
6. Configuration Registers x
6.1. Ethernet Avalon® Memory-Mapped Interface Address Space 6.2. GTS Ethernet Intel® FPGA Hard IP Core CSRs 6.3. Transceiver Avalon® Memory-Mapped Interface Address Space
1. Overview
2. Getting Started
3. GTS Ethernet Intel® FPGA Hard IP Parameters
4. Integrate GTS Ethernet Intel® FPGA Hard IP to the User Application
5. Functional Description
6. Configuration Registers
7. Document Revision History for the GTS Ethernet Intel® FPGA Hard IP User Guide

5.2.3.1. Conditions Triggering XOFF Frame Transmission

The GTS Ethernet Intel® FPGA Hard IP supports retransmission. In retransmission, the IP core retransmits a XOFF frame periodically, extending the pause time, based on signal values.

The TX MAC transmits PAUSE XOFF frames when one of the following conditions occurs:

  • Client requests XOFF transmission—A client can explicitly request that XOFF frames be sent using the i_tx_pause and i_tx_pfc[7:0] signals.
    • When i_tx_pause is asserted, a PAUSE XOFF frame is sent to the Ethernet network when the current frame transmission completes.
    • When i_tx_pfc is asserted, a PFC XOFF packet is transmitted with XOFF requests for each of the Queues that has a bit high in the signal. For example, setting i_tx_pfc to 0x03 sends XOFF requests for Queues 0 and 1.
  • Host (software) requests PAUSE XOFF transmission—Setting the pause request register triggers a request that a PAUSE XOFF frame be sent. Similarly, setting the PFC request register triggers PFC XOFF frame requests for the selected Priority Queues.
  • Retransmission mode—If the retransmit hold-off enable bit has the value of 1, and the i_tx_pause signal remains asserted or the pause request register value remains high, when the time duration specified in the hold-off quanta register has lapsed after the previous PAUSE XOFF transmission, the TX MAC sends another PAUSE XOFF frame to the Ethernet network. The same mechanism applies to PFC. While the IP core is paused in retransmission mode, you cannot use either of the other two methods to trigger a new XOFF frame: the signal or register value is already high.
Note: Intel recommends that you use the flow control ports to backpressure the remote Ethernet node.
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