Low Latency 40-Gbps Ethernet IP Core User Guide

Download PDF
ID 683745
Date 3/08/2021
Public
Document Table of Contents
Document Table of Contents x
1. About the LL 40GbE IP Core 2. Getting Started 3. Functional Description 4. Debugging the Link A. Arria 10 10GBASE-KR Registers B. Additional Information
1. About the LL 40GbE IP Core x
1.1. LL 40GbE IP Core Supported Features 1.2. IP Core Device Family and Speed Grade Support 1.3. IP Core Verification 1.4. Performance and Resource Utilization 1.5. Release Information
1.2. IP Core Device Family and Speed Grade Support x
1.2.1. LL 40GbE IP Core Device Family Support 1.2.2. LL 40GbE IP Core Device Speed Grade Support
1.3. IP Core Verification x
1.3.1. Simulation Environment 1.3.2. Compilation Checking 1.3.3. Hardware Testing
1.4. Performance and Resource Utilization x
1.4.1. Arria 10 Resource Utilization 1.4.2. Stratix V Resource Utilization
2. Getting Started x
2.1. Installation and Licensing for LL 40GbE IP Core for Stratix® V Devices 2.2. Installing and Licensing Intel® FPGA IP Cores 2.3. Specifying the IP Core Parameters and Options 2.4. IP Core Parameters 2.5. Files Generated for Stratix V Variations 2.6. Files Generated for Arria 10 Variations 2.7. Integrating Your IP Core in Your Design 2.8. IP Core Testbenches 2.9. Compiling the Full Design and Programming the FPGA 2.10. Initializing the IP Core
2.2. Installing and Licensing Intel® FPGA IP Cores x
2.2.1. Intel® FPGA IP Evaluation Mode
2.7. Integrating Your IP Core in Your Design x
2.7.1. Pin Assignments 2.7.2. External Transceiver Reconfiguration Controller Required in Stratix V Designs 2.7.3. Transceiver PLL Required in Arria 10 Designs 2.7.4. Handling Potential Jitter in Intel® Arria® 10 Devices 2.7.5. External Time-of-Day Module for Variations with 1588 PTP Feature 2.7.6. Clock Requirements for 40GBASE-KR4 Variations 2.7.7. External TX MAC PLL 2.7.8. Placement Settings for the LL 40GbE Core
2.8. IP Core Testbenches x
2.8.1. Testbench Behavior 2.8.2. Simulating the LL 40GbE IP Core With the Testbenches
2.8.2. Simulating the LL 40GbE IP Core With the Testbenches x
2.8.2.1. Generating the LL 40GbE Testbench 2.8.2.2. Optimizing the IP Core Simulation With the Testbenches 2.8.2.3. Optimization in the 40GBASE-KR4 Testbench 2.8.2.4. Simulating with the Modelsim Simulator 2.8.2.5. Simulating with the NCSim Simulator 2.8.2.6. Simulating with the VCS Simulator 2.8.2.7. Testbench Output Example
3. Functional Description x
3.1. High Level System Overview 3.2. LL 40GbE IP Core Functional Description 3.3. Signals 3.4. Software Interface: Registers 3.5. Ethernet Glossary
3.2. LL 40GbE IP Core Functional Description x
3.2.1. LL 40GbE IP Core TX Datapath 3.2.2. LL 40GbE IP Core TX Data Bus Interfaces 3.2.3. LL 40GbE IP Core RX Datapath 3.2.4. LL 40GbE IP Core RX Data Bus Interfaces 3.2.5. External Reconfiguration Controller 3.2.6. External Transceiver PLL 3.2.7. External TX MAC PLL 3.2.8. Congestion and Flow Control Using Pause Frames 3.2.9. Pause Control and Generation Interface 3.2.10. Pause Control Frame Filtering 3.2.11. Link Fault Signaling Interface 3.2.12. Statistics Counters Interface 3.2.13. 1588 Precision Time Protocol Interfaces 3.2.14. PHY Status Interface 3.2.15. Transceiver PHY Serial Data Interface 3.2.16. Low Latency 40GBASE-KR4 IP Core Variations 3.2.17. Control and Status Interface 3.2.18. Arria 10 Transceiver Reconfiguration Interface 3.2.19. Clocks 3.2.20. Resets
3.2.1. LL 40GbE IP Core TX Datapath x
3.2.1.1. Preamble, Start, and SFD Insertion 3.2.1.2. Address Insertion 3.2.1.3. Length/Type Field Processing 3.2.1.4. Frame Padding 3.2.1.5. Frame Check Sequence (CRC-32) Insertion 3.2.1.6. Inter-Packet Gap Generation and Insertion 3.2.1.7. Error Insertion Test and Debug Feature
3.2.2. LL 40GbE IP Core TX Data Bus Interfaces x
3.2.2.1. LL 40GbE IP Core User Interface Data Bus 3.2.2.2. LL 40GbE IP Core TX Data Bus with Adapters (Avalon-ST Interface) 3.2.2.3. LL 40GbE IP Core TX Data Bus Without Adapters (Custom Streaming Interface) 3.2.2.4. Bus Quantization Effects With Adapters 3.2.2.5. User Interface to Ethernet Transmission
3.2.2.5. User Interface to Ethernet Transmission x
3.2.2.5.1. Order of Transmission
3.2.3. LL 40GbE IP Core RX Datapath x
3.2.3.1. LL 40GbE IP Core RX Filtering 3.2.3.2. LL 40GbE IP Core Preamble Processing 3.2.3.3. IP Core Strict SFD Checking 3.2.3.4. LL 40GbE IP Core FCS (CRC-32) Removal 3.2.3.5. LL 40GbE IP Core CRC Checking 3.2.3.6. LL 40GbE IP Core Malformed Packet Handling 3.2.3.7. RX CRC Forwarding 3.2.3.8. Inter-Packet Gap 3.2.3.9. Pause Ignore 3.2.3.10. Control Frame Identification
3.2.4. LL 40GbE IP Core RX Data Bus Interfaces x
3.2.4.1. LL 40GbE IP Core User Interface Data Bus 3.2.4.2. LL 40GbE IP Core RX Data Bus with Adapters (Avalon-ST Interface) 3.2.4.3. LL 40GbE IP Core RX Data Bus Without Adapters (Custom Streaming Interface)
3.2.8. Congestion and Flow Control Using Pause Frames x
3.2.8.1. Conditions Triggering XOFF Frame Transmission 3.2.8.2. Conditions Triggering XON Frame Transmission
3.2.12. Statistics Counters Interface x
3.2.12.1. OctetOK Count Interface
3.2.13. 1588 Precision Time Protocol Interfaces x
3.2.13.1. Implementing a 1588 System That Includes a LL 40GbE Core 3.2.13.2. PTP Receive Functionality 3.2.13.3. PTP Transmit Functionality 3.2.13.4. External Time-of-Day Module for 1588 PTP Variations 3.2.13.5. PTP Timestamp and TOD Formats 3.2.13.6. 1588 PTP Interface Signals
3.3. Signals x
3.3.1. LL 40GbE IP Core Signals
3.4. Software Interface: Registers x
3.4.1. LL 40GbE IP Core Registers 3.4.2. LL 40GbE Hardware Design Example Registers
3.4.1. LL 40GbE IP Core Registers x
3.4.1.1. PHY Registers 3.4.1.2. Link Fault Signaling Registers 3.4.1.3. LL 40GBASE-KR4 Registers 3.4.1.4. LL 40GbE IP Core MAC Configuration Registers 3.4.1.5. Pause Registers 3.4.1.6. TX Statistics Registers 3.4.1.7. RX Statistics Registers 3.4.1.8. 1588 PTP Registers
3.4.2. LL 40GbE Hardware Design Example Registers x
3.4.2.1. Packet Client Registers
4. Debugging the Link x
4.1. Creating a Signal Tap Debug File to Match Your Design Hierarchy
A. Arria 10 10GBASE-KR Registers x
A.1. 10GBASE-KR PHY Register Definitions
B. Additional Information x
B.1. LL 40GbE IP Core User Guide Archives B.2. LL 40GbE IP Core User Guide Revision History
1. About the LL 40GbE IP Core
2. Getting Started
3. Functional Description
4. Debugging the Link
A. Arria 10 10GBASE-KR Registers
B. Additional Information

3.4. Software Interface: Registers

This section provides information about the memory-mapped registers. You access these registers using the IP core control and status interface. The registers use 32-bit addresses; they are not byte addressable.

Write operations to a read-only register field have no effect. Read operations that address a Reserved register return an unspecified constant. Write operations to Reserved registers have no effect. Accesses to registers that do not exist in your IP core variation have an unspecified result.

Table 33.   LL 40GbE IP Core Register Map OverviewLists the main ranges of the memory mapped registers for the LL 40GbE IP core. Addresses are word addresses. Register address range 0x100–0x2FF is Reserved.

Word Offset

Register Category

0x0B0–0x0FF 40GBASE-KR4 registers
0x300–0x3FF PHY registers
0x400–0x4FF TX MAC registers
0x500–0x5FF RX MAC registers
0x600–0x6FF TX flow control (pause functionality) registers
0x700–0x7FF RX flow control (pause functionality) registers
0x800–0x8FF TX statistics counters
0x900–0x9FF RX statistics counters
0xA00–0xAFF TX 1588 PTP registers
0xB00–0xBFF RX 1588 PTP registers
Table 34.   IP Core Address Map Lists the memory mapped registers for the LL 40GbE IP core. Each register is 32 bits, and the addresses (word offsets) each address a full word. This table does not list the Revision ID, scratch, and name registers present in each of the address ranges at offsets 0x00, 0x01, and 0x02–0x04 respectively. However, those registers appear in the detailed listings with descriptions.

Word Offset

Register Description

0x0B0–0x0BD

40GBASE-KR4 top-level and FEC registers

Accessible only if you turn on Enable KR. FEC registers are accessible only if you also turn on Include FEC sublayer.

0x0BE–0x0BF

Reserved.

0x0C0–0x0CC

40GBASE-KR4 auto-negotiation registers

Accessible only if you turn on Enable KR and Enable Auto-Negotiation.

0x0CD–0x0CF

Reserved.

0x0D0–0x0EB

40GBASE-KR4 link training registers

Accessible only if you turn on Enable KR and Enable Link Training.

0x0EC–0x0FF

Reserved.

0x310–0x344

PHY registers available in all IP core variations

0x405

Link fault signaling register LINK_FAULT_CONFIG

Accessible only if you turn on Enable link fault generation

0x406

IPG column removal register IPG_COL_REM

Accessible only if you turn on Average interpacket gap

0x407

TX maximum size Ethernet frame (in bytes) MAX_TX_SIZE_CONFIG. Value determines whether the IP core increments the CNTR_TX_OVERSIZE register

0x506

RX maximum size Ethernet frame (in bytes) MAX_RX_SIZE_CONFIG. Value determines whether the IP core increments the CNTR_RX_OVERSIZE register.

0x507

RX CRC forwarding configuration register MAC_CRC_CONFIG

0x508

Link fault status register

Provides link fault status information if you turn on Enable link fault generation . Returns zeroes if you turn off Enable link fault generation .

0x50A

Enable RX payload length checking register

Provides enable bit to determine whether the RX error signal flags payload lengths that do not match the length field..

0x605–0x60A

Transmit side pause registers

Accessible only if you set Flow control mode to the value Standard flow control or Priority-based flow control.

0x700–0x703

Receive side pause registers

Accessible only if you set Flow control mode to the value Standard flow control or Priority-based flow control.

0x800–0x837, 0x860–0x861

Transmit side statistics registers

Accessible only if you turn on Enable TX statistics

0x845

Transmit statistics counters configuration register CNTR_TX_CONFIG

Accessible only if you turn on Enable TX statistics

0x846

Transmit statistics counters status register

Accessible only if you turn on Enable TX statistics

0x900–0x937, 0x960–0x961

Receive side statistics registers

Accessible only if you turn on Enable RX statistics

0x945

Receive statistics counters configuration register CNTR_RX_CONFIG

Accessible only if you turn on Enable RX statistics

0x946

Receive statistics counters status register

Accessible only if you turn on Enable RX statistics

0xA00–0xA0C TX 1588 PTP registers

Accessible only if you turn on Enable 1588 PTP

0xB00–0xB06 RX 1588 PTP registers

Accessible only if you turn on Enable 1588 PTP

Table 35.   LL 40GbE Hardware Design Example RegistersLists the memory mapped register ranges for the LL 40GbE IP core hardware design example

Word Offset

Register Category

0x1000–0x1016

Packet client registers

0x2004–0x2023

Reserved

0x4000–0x4C00

 Arria 10 dynamic reconfiguration register base addresses for four-lane variations. Register base address is 0x4000 for Lane 0, 0x4400 for Lane 1, 0x4800 for Lane 2, and 0x4C00 for Lane 3. (Bits [11:10] specify the lane).

Section Content
LL 40GbE IP Core Registers
LL 40GbE Hardware Design Example Registers

Related Information
Level Two Title