F-Tile 25G Ethernet IP User Guide

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ID 750198
Date 8/13/2025
Public
Document Table of Contents
Document Table of Contents x
1. About the F-Tile 25G Ethernet Intel FPGA IP User Guide 2. About this IP 3. Getting Started 4. F-Tile 25G Ethernet IP Parameters 5. Functional Description 6. Reset 7. Interfaces and Signal Descriptions 8. Control, Status, and Statistics Register Descriptions 9. F-Tile 25G Ethernet IP User Guide Archive 10. Document Revision History for the F-Tile 25G Ethernet 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 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 IP Cores x
3.1.1. Altera 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 IP 3.5.3. Placement Settings for the F-Tile 25G Ethernet IP Core
4. F-Tile 25G Ethernet IP Parameters x
4.1. Main Tab Options 4.2. Analog Parameter Tab Options
4.2. Analog Parameter Tab Options x
4.2.1. Analog Parameter Settings
5. Functional Description x
5.1. F-Tile 25G Ethernet IP Core Functional Description 5.2. User Interface to Ethernet Transmission
5.1. F-Tile 25G Ethernet IP Core Functional Description x
5.1.1. F-Tile 25G Ethernet IP TX MAC Datapath 5.1.2. 25 GbE TX PCS 5.1.3. F-Tile 25G Ethernet IP Core RX MAC Datapath 5.1.4. Link Fault Signaling Interface 5.1.5. 25 GbE RX PCS 5.1.6. Flow Control
5.1.1. F-Tile 25G Ethernet 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 25G Ethernet 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 5.1.6.3. Dynamic Reconfiguration QSF Settings
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. Dynamic Reconfiguration Interface Signals 7.7. Miscellaneous Status and Debug 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. TX Statistics Registers 8.4.2. RX Statistics Registers
1. About the F-Tile 25G Ethernet Intel FPGA IP User Guide
2. About this IP
3. Getting Started
4. F-Tile 25G Ethernet IP Parameters
5. Functional Description
6. Reset
7. Interfaces and Signal Descriptions
8. Control, Status, and Statistics Register Descriptions
9. F-Tile 25G Ethernet IP User Guide Archive
10. Document Revision History for the F-Tile 25G Ethernet IP User Guide

8.2. RX MAC Registers

Table 25.  RX MAC Registers
Addr Name Description Reset Access
0x500 RXMAC_REVID

RX MAC revision ID for 25G Ethernet IP core.

0x2007 2022

 RO
0x501 RXMAC_SCRATCH Scratch register available for testing. 0x0000 0000 RW
0x502 RXMAC_NAME_0

First 4 characters of IP core variation identifier string, "25gMACRxCSR".

 0x3235 674D

RO
0x503 RXMAC_NAME_1 Next 4 characters of IP core variation identifier string, "ACRx". 0x4143 5278

RO
0x504 RXMAC_NAME_2 Final 4 characters of IP core variation identifier string, "0CSR". The "0" is unprintable. 0x0043 5352

RO
0x506 MAX_RX_SIZE_CONFIG Specifies the maximum frame length available. The MAC asserts l1_rx_error[3] when the length of the received frame exceeds the value of this register.

If the IP core receives an Ethernet frame of size greater than the number of bytes specified in this register, and the IP core includes statistics registers, the IP core increments the 64-bit CNTR_RX_OVERSIZE counter.

 0xXXXX 2580 2

RW
0x507 MAC_CRC_CONFIG The RX CRC forwarding configuration register. The following encodings are defined:
  • 1'b0: Remove RX CRC, do not forward it to the RX client interface
  • 1'b1: Retain RX CRC, forward it to the RX client interface
In either case, the IP core checks the incoming RX CRC and flags errors.		 31'hX1'b0 2

RW
0x508 LINK_FAULT

Link Fault Status Register.

For regular (non-unidirectional) Link Fault, implements IEEE 802.3 Ethernet Clause 46.

For unidirectional Link Fault, implements IEEE 802.3 Ethernet Clause 66.

If you turn on Enable link fault generation, the following bit fields are defined:
  • Bit[0]: A bit value of 1 indicates local fault is detected.
  • Bit[1]: A bit value of 1 indicates remote fault is detected.
 30'hX2'b00 2

RO
0x50A RXMAC_CONTROL RX MAC Control Register. A single bit is defined:
  • Bit [1]: VLAN detection disabled. This bit is deasserted by default implying VLAN detection is enabled.
  • Bit [4]: Enable check for Preamble. By default, Preamble check is turned off. Write 1'b1 to this bit to enable preamble checking. This bit is a don't care when you turn on Enable Preamble Passthrough.
 27'hX_5'b0XX0X 2 RW
2 X means "Don't Care".
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