F-Tile Ethernet Intel® FPGA Hard IP User Guide

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ID 683023
Date 10/02/2023
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Document Table of Contents
Document Table of Contents x
1. Overview 2. Getting Started 3. F-Tile Ethernet Intel® FPGA Hard IP Parameters 4. Functional Description 5. Clocks 6. Resets 7. Interface Overview 8. Configuration Registers 9. Supported Modules and IPs 10. Supported Tools 11. F-Tile Ethernet Intel® FPGA Hard IP User Guide Archives 12. Document Revision History for the F-Tile Ethernet Intel® FPGA Hard IP User Guide
1. Overview x
1.1. Ethernet System in F-Tile Overview 1.2. F-Tile Ethernet Intel® FPGA Hard IP Overview
1.2. F-Tile Ethernet Intel® FPGA Hard IP Overview 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 F-Tile Ethernet Intel® FPGA Hard IP Cores 2.2. Specifying the IP Core Parameters and Options 2.3. Reference and System PLL Clock for your IP Design 2.4. Generated File Structure 2.5. Generating Tile Files 2.6. IP Core Testbenches
2.4. Generated File Structure x
2.4.1. Generating IP-XACT File
4. Functional Description x
4.1. Datapath Description 4.2. F-Tile Ethernet Intel® FPGA Hard IP MAC 4.3. PCS, OTN, and FlexE Modes 4.4. Precision Time Protocol 4.5. Auto-Negotiation and Link Training
4.2. F-Tile Ethernet Intel® FPGA Hard IP MAC x
4.2.1. MAC TX Datapath 4.2.2. MAC RX Datapath 4.2.3. Congestion and Flow Control Using PAUSE or Priority Flow Control (PFC) 4.2.4. Link Fault Signaling 4.2.5. Order of Ethernet Transmission
4.2.1. MAC TX Datapath x
4.2.1.1. TX Preamble, Start, and SFD Insertion 4.2.1.2. Source Address Insertion 4.2.1.3. Length/Type Field Processing 4.2.1.4. Frame Padding 4.2.1.5. Frame Check Sequence (CRC-32) Insertion 4.2.1.6. Inter-Packet Gap Generation and Insertion 4.2.1.7. TX Packing Logic
4.2.2. MAC RX Datapath x
4.2.2.1. RX Preamble Processing 4.2.2.2. RX Strict SFD Checking 4.2.2.3. RX FCS Checking 4.2.2.4. RX Malformed Packet Handling 4.2.2.5. Removing PAD Bytes and FCS Bytes from RX Frames 4.2.2.6. RX Undersized Frames, Oversized Frames, and Frames with Length Errors 4.2.2.7. Inter-Packet Gap
4.2.3. Congestion and Flow Control Using PAUSE or Priority Flow Control (PFC) x
4.2.3.1. Conditions Triggering XOFF Frame Transmission 4.2.3.2. Conditions Triggering XON Frame Transmission 4.2.3.3. Pause Control and Generation Interface 4.2.3.4. Pause Control Frame Filtering
4.3. PCS, OTN, and FlexE Modes x
4.3.1. PCS Mode 4.3.2. OTN Mode 4.3.3. FlexE Mode
4.4. Precision Time Protocol x
4.4.1. Features 4.4.2. PTP Timestamp Accuracy 4.4.3. PTP Client Flow 4.4.4. RX Virtual Lane Offset Calculation for No FEC Variants 4.4.5. Virtual Lane Order and Offset Values 4.4.6. UI Adjustment 4.4.7. Reference Time Interval 4.4.8. Minimum and Maximum Reference Time (TAM) Interval for UI Measurement (Hardware) 4.4.9. UI Value and PMA Delay 4.4.10. Routing Delay Adjustment for Advanced Timestamp Accuracy Mode 4.4.11. Routing Delay Adjustment for Basic Timestamp Accuracy Mode
4.4.3. PTP Client Flow x
4.4.3.1. PTP TX Client Flow 4.4.3.2. PTP RX Client Flow
4.4.6. UI Adjustment x
4.4.6.1. TX UI Adjustment 4.4.6.2. RX UI Adjustment
5. Clocks x
5.1. Clock Connections in Single Instance Operation 5.2. Clock Connections in Multiple Instance Operation 5.3. Clock Connections in MAC Asynchronous FIFO Operation 5.4. Clock Connections in PTP-Based Synchronous and Asynchronous Operation 5.5. Clock Connections in Synchronous Ethernet Operation 5.6. Custom Cadence
6. Resets x
6.1. Reset Signals 6.2. Reset Sequence
7. Interface Overview x
7.1. Status Interface 7.2. TX MAC Avalon ST Client Interface 7.3. RX MAC Avalon ST Aligned Client Interface 7.4. TX MAC Segmented Client Interface 7.5. RX MAC Segmented Client Interface 7.6. MAC Flow Control Interface 7.7. PCS Mode TX Interface 7.8. PCS Mode RX Interface 7.9. FlexE and OTN Mode TX Interface 7.10. FlexE and OTN Mode RX Interface 7.11. Custom Rate Interface 7.12. 32-bit Soft CWBIN Counters 7.13. Reconfiguration Interfaces 7.14. Precision Time Protocol Interface
7.2. TX MAC Avalon ST Client Interface x
7.2.1. TX MAC Avalon ST Client Interface with Disabled Preamble Passthrough 7.2.2. TX MAC Avalon ST Client Interface with Enabled Preamble Passthrough 7.2.3. Using MAC Avalon ST skip_crc Signal to Control Source Address, PAD, and CRC Insertion 7.2.4. Using MAC Avalon ST i_tx_error Signal to Mark Packets Invalid
7.3. RX MAC Avalon ST Aligned Client Interface x
7.3.1. RX MAC Avalon ST Client Interface with Disabled Preamble Passthrough 7.3.2. RX MAC Avalon ST Client Interface with Enabled Passthrough and RX CRC Forwarding 7.3.3. RX MAC Adapter Limitations 7.3.4. RX MAC Avalon ST Client Interface Status
7.4. TX MAC Segmented Client Interface x
7.4.1. TX MAC Segmented Client Interface with Disabled Preamble Passthrough 7.4.2. TX MAC Segmented Client Interface with Enabled Preamble Passthrough 7.4.3. Using MAC Segmented skip_crc Signal to Control Source Address, PAD, and CRC Insertion 7.4.4. Using MAC Segmented i_tx_mac_error to Mark Packets Invalid
7.5. RX MAC Segmented Client Interface x
7.5.1. RX MAC Segmented Client Interface with Disabled Preamble Passthrough 7.5.2. RX MAC Segmented Client Interface with Enabled Passthrough and RX CRC Forwarding 7.5.3. RX MAC Segmented Client Interface Status and Errors
7.13. Reconfiguration Interfaces x
7.13.1. Ethernet Reconfiguration Interfaces 7.13.2. Transceiver Reconfiguration Interfaces
7.14. Precision Time Protocol Interface x
7.14.1. Time-of-Day Interface 7.14.2. TX 2-Step Timestamp Interface 7.14.3. TX 1-Step Timestamp Interface 7.14.4. RX Timestamp Interface 7.14.5. PTP Status Interface 7.14.6. PTP Tile Interface
7.14.3. TX 1-Step Timestamp Interface x
7.14.3.1. PTP Field Offset for 1-Step Operation
8. Configuration Registers x
8.1. Ethernet Avalon® Memory-Mapped Interface Address Space 8.2. Transceiver Avalon® Memory-Mapped Interface Address Space
8.1. Ethernet Avalon® Memory-Mapped Interface Address Space x
8.1.1. Ethernet Hard IP Core CSRs 8.1.2. FEC and Transceiver Control and Status Registers
9. Supported Modules and IPs x
9.1. F-Tile Auto-Negotiation and Link Training For Ethernet Intel® FPGA IP 9.2. PTP Tile Adapter
9.1. F-Tile Auto-Negotiation and Link Training For Ethernet Intel® FPGA IP x
9.1.1. Overview 9.1.2. Release Information 9.1.3. Functional Description 9.1.4. Parameters 9.1.5. Clocks and Resets 9.1.6. Registers
9.2. PTP Tile Adapter x
9.2.1. Overview 9.2.2. Clocks, Reset, and Interface Ports 9.2.3. PTP Asymmetry Delay Reconfiguration Interface 9.2.4. PTP Peer-to-Peer MeanPathDelay Reconfiguration Interface
10. Supported Tools x
10.1. F-Tile Channel Placement Tool 10.2. Ethernet Toolkit Overview
10.2. Ethernet Toolkit Overview x
10.2.1. Features
1. Overview
2. Getting Started
3. F-Tile Ethernet Intel® FPGA Hard IP Parameters
4. Functional Description
5. Clocks
6. Resets
7. Interface Overview
8. Configuration Registers
9. Supported Modules and IPs
10. Supported Tools
11. F-Tile Ethernet Intel® FPGA Hard IP User Guide Archives
12. Document Revision History for the F-Tile Ethernet Intel® FPGA Hard IP User Guide

5.5. Clock Connections in Synchronous Ethernet Operation

When you enable the Synchronous Ethernet (SyncE) operation, two or more channels can share the off-chip cleanup PLL clock output.

The Synchronous Ethernet standard, described in the ITU-T G.8261, G.8262, and G.8264 recommendations, requires that the TX clock be filtered to maintain synchronization with the RX reference clock through a sequence of nodes. The expected usage is that user logic drives the transceiver reference clocks with a filtered version of the RX recovered clock signal, to ensure the receive and transmit functions remain synchronized. In this usage model, a design component outside the IP core performs the filtering off chip.

In the diagram below, the recovered clock outputs from the IPs can be connected to the off-chip cleanup PLL using tile PIN. In F-tile, the recovered clock from the FGT PMA can be driven to dedicated clock output pins on the tile itself. Each F-tile has only two such clock outputs: FGT QUADs 2 and 3. Each has one dedicated clock output pin (Refclk8/9).

The primary and backup cleanup clocks come from recovered clock output pins from a pair of ports connected to remote stations on the same SyncE network, with the transceiver reference clock is sourced from the output of the cleanup PLL.

In the diagram below, out_cdr_clk0 is the clock that goes to off-chip cleanup PLL.

Figure 25. Clock Connection of Sync-E clock through CDR clock out pin
Note: You must set the Custom Cadence mode to match the PPM difference between clocks when the Ethernet IP system clock is derived from a different reference clock than the transceiver clock.

Implementation of Synchronous Ethernet (SyncE) Operation

To enable the recovered clock output from F-tile, select the Enable dedicated CDR Clock Output in the IP parameter editor as shown below.
Figure 26. Enable dedicated CDR Clock Output IP Parameter Editor

The output frequency is equal to the nominal incoming refclk divided by the pre-divider on the RX path:o_cdr_divclk=refclk/N.

To retrieve the N divider value, follow the steps below:

  1. Compile the design.
  2. Open Compilation Report, then go to Logic Generation Tool > IP Parameter Settings Report.
  3. Search cdr_n_counter.
  4. [optional] You can also search cdr_f_ref_hz to double confirm the input reference clock frequency.
    Figure 27. Retrieve the N divider Value
The table below shows the recovered clock frequencies with respect to input reference clock.
Table 29.  Recovered Clock Frequency
NRZ/PAM4 Input Refclk (MHz) N divider Output Recovered Clk (MHz)
NRZ 156.25 4 39.0625
156.25 6 26.0417
312.5 8 39.0625
312.5 12 26.0417
322.265625 12 26.8554688
PAM4 156.25 6 26.0417
312.5 12
Note: Make sure the DUT top signal o_cdr_divclk is connected to the system PLL IP.
To connect to the system PLL, select Enable FGT CDR Output in the IP parameter editor, as shown in the figure below.
Figure 28. System PLL Clocks Intel FPGA IP
Note: In the IP Parameter Editor, you can Enable the dedicated CDR clock output for multiple IPs. However, if you want to enable two dedicated CDR clock outputs from different IPs, Enable FGT CDR Output #0 and Enable FGT CDR Output #1 must be enabled in the system PLL.

Example Design Generation of Synchronous Ethernet Operation

  1. To generate the example design, after selecting the Enable dedicated CDR Clock Output in the IP parameter editor, go to Example Design tab.
  2. In the Select Design parameter under Available example Designs, you can select the following options:
    Figure 29. Select Designs Example Design
    • 2x25G ED for SyncE
    • Single instance of IP core
    Note: The multi instance of IP core is not supported when Enable dedicated CDR Clock Output is set to on.
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