F-Tile Low Latency 50G Ethernet Intel® FPGA IP User Guide

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ID 758946
Date 1/09/2024
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Document Table of Contents
Document Table of Contents x
1. About the F-Tile Low Latency 50G Ethernet Intel® FPGA IP User Guide 2. About this IP 3. Getting Started 4. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Parameters 5. Functional Description 6. Reset 7. Interfaces and Signal Descriptions 8. Control, Status, and Statistics Register Descriptions 9. Document Revision History for the F-Tile Low Latency 50G Ethernet Intel® FPGA IP User Guide
2. About this IP x
2.1. Release Information 2.2. Features 2.3. Device Family Support 2.4. Performance and Resource Utilization
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IP Cores 3.2. Specifying the 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. Compiling the Full Design and Programming the FPGA
3.1. Installing and Licensing Intel® FPGA IP Cores x
3.1.1. Intel® FPGA IP Evaluation Mode
3.5. Integrating Your IP Core in Your Design x
3.5.1. Pin Assignments 3.5.2. Adding the F-Tile Reference and System PLL Clocks Intel® FPGA IP 3.5.3. Placement Settings for the 50G Ethernet Intel FPGA IP Core
5. Functional Description x
5.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Functional Description 5.2. User Interface to Ethernet Transmission
5.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Functional Description x
5.1.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP TX MAC Datapath 5.1.2. 50 GbE TX PCS 5.1.3. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Core RX MAC Datapath 5.1.4. Link Fault Signaling Interface 5.1.5. 50 GbE RX PCS 5.1.6. Flow Control
5.1.1. F-Tile Low Latency 50G Ethernet Intel® FPGA IP TX MAC Datapath x
5.1.1.1. Frame Padding 5.1.1.2. Preamble Insertion 5.1.1.3. Inter-Packet Gap Generation and Insertion 5.1.1.4. Frame Check Sequence (CRC32) Insertion
5.1.3. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Core RX MAC Datapath x
5.1.3.1. IP Core Preamble Processing 5.1.3.2. IP Core Malformed Packet Handling 5.1.3.3. Length/Type Field Processing
5.1.3.3. Length/Type Field Processing x
5.1.3.3.1. Length Checking 5.1.3.3.2. RX CRC Checking and Dynamic Forwarding
5.1.6. Flow Control x
5.1.6.1. TX Pause/PFC Flow Control Frame Transmission Request 5.1.6.2. XON/XOFF Pause Frames
5.2. User Interface to Ethernet Transmission x
5.2.1. Order of Transmission 5.2.2. Bit Order For TX and RX Datapaths
7. Interfaces and Signal Descriptions x
7.1. TX MAC Interface to User Logic 7.2. RX MAC Interface to User Logic 7.3. Transceivers 7.4. Transceiver Reconfiguration Signals 7.5. Avalon® Memory-Mapped Management Interface 7.6. Miscellaneous Status and Debug Signals 7.7. Flow Control Signals 7.8. Clock Signals 7.9. Reset Signals
8. Control, Status, and Statistics Register Descriptions x
8.1. TX MAC Registers 8.2. RX MAC Registers 8.3. Pause/PFC Flow Control Registers 8.4. Statistics Registers 8.5. Hard IP Registers
8.4. Statistics Registers x
8.4.1. Statistics Registers
1. About the F-Tile Low Latency 50G Ethernet Intel® FPGA IP User Guide
2. About this IP
3. Getting Started
4. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Parameters
5. Functional Description
6. Reset
7. Interfaces and Signal Descriptions
8. Control, Status, and Statistics Register Descriptions
9. Document Revision History for the F-Tile Low Latency 50G Ethernet Intel® FPGA IP User Guide

4. F-Tile Low Latency 50G Ethernet Intel® FPGA IP Parameters

The F-Tile Low Latency 50G Ethernet Intel® FPGA IP parameter editor provides the parameters you can set to configure the F-Tile Low Latency 50G Ethernet Intel® FPGA IP core and design example.

Table 6.  IP Core Parameters: Main Tab
Parameter Range Default Setting Description
General Options
Ready Latency 0, 3 0

Selects the readyLatency value on the TX client interface. readyLatency is an Avalon® streaming interface property that defines the number of clock cycles of delay from when the IP core asserts the l1_tx_ready signal to the clock cycle in which the IP core can accept data on the TX client interface. Refer to the Avalon® Interface Specifications.

Selecting a latency of 3 eases timing closure at the expense of increased latency for the datapath.

If you set the readyLatency to 3 and turn on standard flow control, data might be delayed in the IP core while the IP core is backpressured.

Core Variant MAC+PCS+PMA, MAC+PCS+PMA Selects the primary blocks to include in the IP core variation.
  • MAC+PCS+PMA—The IP core generates with the capability of MAC, PCS, and PMA protocol layers.
Flow Control Options
Enable flow control Enabled, Disabled Disabled When enabled, the IP core implements flow control. When either link partner experiences congestion, the respective transmit control sends pause frames. Register settings in the Pause/PFC Flow Control Registers control flow control behavior, including whether the IP core implements standard flow control or priority-based flow control.

If you turn on standard flow control and set the readyLatency to 3, data might be delayed in the IP core while the IP core is backpressured.

Number of queues 1-8 8 Specifies the number of queues used in managing flow control.
MAC Options
Enable link fault generation Enabled, Disabled Disabled When enabled, the IP core implements link fault signaling as defined in the IEEE 802.3-2012 IEEE Standard for Ethernet. The MAC includes a Reconciliation Sublayer (RS) to manage local and remote faults. When enabled, the local RS TX logic can transmit remote fault sequences in case of a local fault and can transmit IDLE control words in case of a remote fault.
Enable preamble passthrough Enabled, Disabled Disabled When enabled, the IP core is in RX and TX preamble pass-through mode. In RX preamble pass-through mode, the IP core passes the preamble and Start Frame Delimiter (SFD) to the client instead of stripping them out of the Ethernet packet. In TX preamble pass-through mode, the client specifies the preamble and provides the SFD to be sent in the Ethernet frame.
Enable TX CRC passthrough Enabled, Disabled Disabled When enabled, TX MAC does not insert the CRC-32 checksum in the out-going frame. In pass-through mode, the client must provide frames with at least 64 bytes, including the Frame Check Sequence (FCS). When disabled, the TX MAC computes and inserts a 32-bit FCS in the TX MAC frame.
Enable MAC statistic counters Enabled, Disabled Enabled When enabled, the IP core includes statistics counters that characterize TX and RX traffic.
Configuration, Debug and Extension Options
Reference clock frequency 156.25 156.25 Specifies the frequency of the transceiver CDR reference clock input in MHz.
Table 7.  IP Core Parameters: Analog Parameter Tab
Parameter Range Default Setting Description
FGT TX EQ
FGT TXEQ Post Tap 1, 1.0 step size 0–19 0 Options for FGT TX EQ Post Tap 1, in 1.0 step size increments.
FGT TXEQ Main Tap, 1.0 step size 0–55 35 Options for FGT TX EQ Main Tap, in 1.0 step size increments.
FGT TXEQ Pre Tap 1, 1.0 step size 0–15 5 Options for FGT TX EQ Pre Tap 1, in 1.0 step size increments.
FGT TXEQ Pre Tap 2, 1.0 step size 0–17 0 Options for FGT TX EQ Pre Tap 2, in 1.0 step size increments.
FGT RX
Select FGT Onchip Termination RX_ONCHIP_TERMINATION_R_1(85 Ohms)

RX_ONCHIP_TERMINATION_R_2(100 ohms)

RX_ONCHIP_TERMINATION_R_1(85_Ohms) Selects FGT RX termination resistor setting.
Enable FGT RX AC Couple DISABLE

ENABLE

ENABLE Enable RX external AC coupling setting.
Enable FGT VSR Mode VSR_MODE_LOW_LOSS

VSR_MODE_HIGH_LOSS

VSR_MODE_DISABLE

VSR_MODE_DISABLE Enable VSR mode setting.
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