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

Download PDF
ID 758946
Date 4/03/2024
Public
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 IPs 3.2. Specifying the IP Parameters and Options 3.3. Simulating the IP 3.4. Generated File Structure 3.5. Integrating Your IP in Your Design 3.6. Compiling the Full Design and Programming the FPGA
3.1. Installing and Licensing Intel® FPGA IPs x
3.1.1. Intel® FPGA IP Evaluation Mode
3.5. Integrating Your IP 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
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 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 RX MAC Datapath x
5.1.3.1. IP Preamble Processing 5.1.3.2. IP 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

7.8. Clock Signals

The F-Tile Reference and System PLL Clocks Intel® FPGA IP is required to generate i_clk_ref and i_clk_sys input clocks that drive this IP.

A 390.625 MHz transmit clock (clk_txmac) is derived from the TX clock divider of the F-Tile Ethernet Intel® FPGA Hard IP. This clock is guaranteed stable when tx_lanes_stable is high.

A 390.625 MHz receive clock (clk_rxmac) is derived from the RX clock divider of the F-Tile Ethernet Intel® FPGA Hard IP. This clock is guaranteed stable when rx_pcs_ready is high.

The Avalon® memory-mapped clock (clk_status) is nominally 100 MHz but can be as high as 125 MHz.

Table 18.  Clock Signals
Signal Name Direction Width Nominal Frequency Description
i_clk_ref Input 1  

156.25 MHz transceiver reference clock. You must specify this frequency in the F-Tile Reference and System PLL Clocks Intel® FPGA IP FGT refclk frequency IP parameter.

Connect this signal to the out_refclk_fgt_<i> output signal of the F-Tile Reference and System PLL Clocks Intel® FPGA IP.

i_clk_sys Input 1  

805.6640625 MHz Ethernet system clock. You must specify this frequency in the F-Tile Reference and System PLL Clocks Intel® FPGA IP Mode of system PLL IP parameter.

Connect this signal to the out_systempll_clk_<i> signal of the F-Tile Reference and System PLL Clocks Intel® FPGA IP.

clk_txmac Output 1 390.625 MHz Clock for TX section.
clk_rxmac Output 1 390.625 MHz Clock for TX section.
clk status Input 1 100 MHz Avalon® memory-mapped interface clock.
reconfig_clk Input 1 100 MHz Transceiver reconfiguration clock.
Level Two Title