Low Latency Ethernet 10G MAC Intel® Cyclone® 10 GX FPGA IP Design Example User Guide

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ID 683354
Date 11/30/2020
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Document Table of Contents
Document Table of Contents x
1. Quick Start Guide 2. 10GBASE-R Ethernet Design Example for Intel® Cyclone® 10 GX Devices 3. 10M/100M/1G/2.5G/5G/10G (USXGMII) Ethernet Design Example for Intel® Cyclone® 10 GX Devices 4. Interface Signals Description 5. Configuration Registers Description 6. Low Latency Ethernet 10G MAC Intel® Cyclone® 10 GX FPGA IP Design Example User Guide Archives 7. Document Revision History for the Low Latency Ethernet 10G MAC Intel® Cyclone® 10 GX FPGA IP Design Example User Guide
1. Quick Start Guide x
1.1. Directory Structure 1.2. Generating the Design 1.3. Compiling and Simulating the Design 1.4. Compiling and Testing the Design in Hardware
1.2. Generating the Design x
1.2.1. Procedure 1.2.2. Design Example Parameters
1.3. Compiling and Simulating the Design x
1.3.1. Procedure 1.3.2. Testbench
1.4. Compiling and Testing the Design in Hardware x
1.4.1. Procedure 1.4.2. Hardware Setup
2. 10GBASE-R Ethernet Design Example for Intel® Cyclone® 10 GX Devices x
2.1. Features 2.2. Hardware and Software Requirements 2.3. Functional Description 2.4. Simulation 2.5. Hardware Testing 2.6. Interface Signals 2.7. Configuration Registers
2.3. Functional Description x
2.3.1. Design Components 2.3.2. Clocking and Reset Scheme
2.5. Hardware Testing x
2.5.1. Test Cases
3. 10M/100M/1G/2.5G/5G/10G (USXGMII) Ethernet Design Example for Intel® Cyclone® 10 GX Devices x
3.1. Features 3.2. Hardware and Software Requirements 3.3. Functional Description 3.4. Simulation 3.5. Hardware Testing 3.6. Interface Signals 3.7. Configuration Registers
3.3. Functional Description x
3.3.1. Design Components 3.3.2. Clocking Scheme 3.3.3. Reset Scheme
3.4. Simulation x
3.4.1. Test Case
3.5. Hardware Testing x
3.5.1. Test Procedure
4. Interface Signals Description x
4.1. Clock and Reset Interface Signals 4.2. Avalon® Memory-Mapped Interface Signals 4.3. Avalon® Streaming Interface Signals 4.4. PHY Interface Signals 4.5. Status Interface
5. Configuration Registers Description x
5.1. Register Access Definition 5.2. Low Latency Ethernet 10G MAC 5.3. PHY
5.3. PHY x
5.3.1. 1G/2.5G/5G/10G Multi-rate PHY Register Map Register Definitions
1. Quick Start Guide
2. 10GBASE-R Ethernet Design Example for Intel® Cyclone® 10 GX Devices
3. 10M/100M/1G/2.5G/5G/10G (USXGMII) Ethernet Design Example for Intel® Cyclone® 10 GX Devices
4. Interface Signals Description
5. Configuration Registers Description
6. Low Latency Ethernet 10G MAC Intel® Cyclone® 10 GX FPGA IP Design Example User Guide Archives
7. Document Revision History for the Low Latency Ethernet 10G MAC Intel® Cyclone® 10 GX FPGA IP Design Example User Guide

5.3.1. 1G/2.5G/5G/10G Multi-rate PHY

This topic lists the byte offsets of the 1G/2.5G/5G/10G Multi-rate variant registers for Intel® Cyclone® 10 GX devices.

Register Map

You can access the 32-bit configuration registers via the Avalon® memory-mapped interface.

Table 21.  Register Map Overview
Address Range Usage Register Width Configuration
0x400 : 0x41F USXGMII 32 1G/2.5G/5G/10G (USXGMII)
0x461 Serial Loopback 32 1G/2.5G/5G/10G (USXGMII)

Register Definitions

Observe the following guidelines when accessing the registers:
  • Do not write to reserved or undefined registers.
  • When writing to the registers, perform read-modify-write operation to ensure that reserved or undefined register bits are not overwritten.
Table 22.  1G/2.5G/5G/10G Multi-rate PHY Register Definitions
Word Offset Name Description Access HW Reset Value
0x400 usxgmii_control Control Register — —
Bit [0]: USXGMII_ENA:
  • 0: 10GBASE-R mode
  • 1: USXGMII mode
 RW 0
Bit [1]: USXGMII_AN_ENA is used when USXGMII_ENA is set to 1:
  • 0: Disables USXGMII Auto-Negotiation and manually configures the operating speed with the USXGMII_SPEED register.
  • 1: Enables USXGMII Auto-Negotiation, and automatically configures operating speed with link partner ability advertised during USXGMII Auto-Negotiation.
RW 1
Bit [4:2]: USXGMII_SPEED is the operating speed of the PHY in USXGMII mode and USE_USXGMII_AN is set to 0.
  • 3’b000: 10M
  • 3’b001: 100M
  • 3’b010: 1G
  • 3’b011: 10G
  • 3’b100: 2.5G
  • 3’b101: 5G
  • 3’b110: Reserved
  • 3’b111: Reserved
 RW 0
Bit [8:5]: Reserved — —
Bit [9]: RESTART_AUTO_NEGOTIATION

Write 1 to restart Auto-Negotiation sequence The bit is cleared by hardware when Auto-Negotiation is restarted.

 RWC 0
Bit [31:10]: Reserved — —
0x401 usxgmii_status Status Register — —
Bit [1:0]: Reserved — —
Bit [2]: LINK_STATUS indicates link status for USXGMII all speeds
  • 1: Link is established
  • 0: Link synchronization is lost, a 0 is latched
 RO 0
Bit [4:3]: Reserved — —
Bit [5]: AUTO_NEGOTIATION_COMPLETE

A value of 1 indicates the Auto-Negotiation process is completed.

 RO 0
Bit [31:6]: Reserved — —
0x402:0x404 Reserved — — —
0x405 usxgmii_partner_ability Device abilities advertised to the link partner during Auto-Negotiation — —
Bit [6:0]: Reserved — —
Bit [7]: EEE_CLOCK_STOP_CAPABILITY
Indicates whether or not energy efficient Ethernet (EEE) clock stop is supported.
  • 0: Not supported
  • 1: Supported
 RO 0
Bit [8]: EEE_CAPABILITY
Indicates whether or not EEE is supported.
  • 0: Not supported
  • 1: Supported
 RO 0
Bit [11:9]: SPEED
  • 3'b000: 10M
  • 3'b001: 100M
  • 3'b010: 1G
  • 3'b011: 10G
  • 3'b100: 2.5G
  • 3'b101: 5G
  • 3'b110: Reserved
  • 3'b111: Reserved
 RO 0
Bit [12]: DUPLEX
Indicates the duplex mode.
  • 0: Half duplex
  • 1: Full duplex
 RO 0
Bit [13]: Reserved — —
Bit [14]: ACKNOWLEDGE

A value of 1 indicates that the device has received three consecutive matching ability values from its link partner.

 RO 0
Bit [15]: LINK
Indicates the link status.
  • 0: Link down
  • 1: Link up
 RO 0
Bit [31:16]: Reserved — —
0x406:0x411 Reserved — — —
0x412 usxgmii_link_timer

Auto-Negotiation link timer. Sets the link timer value in bit [19:14] from 0 to 2 ms in approximately 0.05-ms steps. You must program the link timer to ensure that it matches the link timer value of the external NBASE-T PHY IP.

The reset value sets the link timer to approximately 1.6 ms.

Bits [13:0] are reserved and always set to 0.

 [19:14]: RW

[13:0]: RO

 [19:14]: 1F

[13:0]: 0
0x413:0x41F Reserved — — —
0x461 phy_serial_loopback Configures the transceiver serial loopback in the PMA from TX to RX. — —
Bit [0]
  • 0: Disables the PHY serial loopback
  • 1: Enables the PHY serial loopback
 RW 0
Bit [31:1]: Reserved — —
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