F-Tile Architecture and PMA and FEC Direct PHY IP User Guide

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ID 683872
Date 11/04/2024
Public
Document Table of Contents
Document Table of Contents x
1. F-Tile Overview 2. F-Tile Architecture 3. Implementing the F-Tile PMA/FEC Direct PHY Intel® FPGA IP 4. Implementing the F-Tile Reference and System PLL Clocks Intel® FPGA IP 5. F-Tile PMA/FEC Direct PHY Design Implementation 6. Supported Tools 7. Debugging F-Tile Transceiver Links 8. F-Tile Architecture and PMA and FEC Direct PHY IP User Guide Archives 9. Document Revision History for the F-Tile Architecture and PMA and FEC Direct PHY IP User Guide A. Appendix
1. F-Tile Overview x
1.1. Device Family Support
2. F-Tile Architecture x
2.1. F-Tile Building Blocks 2.2. F-Tile Placement Rules 2.3. PMA Architecture 2.4. Clock Architecture
2.1. F-Tile Building Blocks x
2.1.1. FHT and FGT PMAs 2.1.2. 400G Hard IP and 200G Hard IP 2.1.3. PMA Data Rates 2.1.4. FEC Architecture 2.1.5. PCIe* Hard IP 2.1.6. Bonding Architecture 2.1.7. Deskew Logic 2.1.8. Embedded Multi-die Interconnect Bridge (EMIB) 2.1.9. IEEE 1588 Precision Time Protocol for Ethernet 2.1.10. Clock Networks 2.1.11. Reconfiguration Interfaces
2.2. F-Tile Placement Rules x
2.2.1. PMA-to-Fracture Mapping 2.2.2. Determining Which PMA to Map to Which Fracture 2.2.3. Hard IP Placement Rules 2.2.4. IEEE 1588 Precision Time Protocol Placement Rules 2.2.5. Topologies 2.2.6. FEC Placement Rules 2.2.7. Clock Rules and Restrictions 2.2.8. Bonding Placement Rules 2.2.9. Preserving Unused PMA Lanes
2.2.1. PMA-to-Fracture Mapping x
2.2.1.1. FHT-PMA-to-400G-Hard-IP-Fracture Mapping 2.2.1.2. FGT-PMA-to-400G-Hard-IP-Fracture Mapping 2.2.1.3. FGT-PMA-to-200G-Hard-IP-Fracture Mapping
2.2.2. Determining Which PMA to Map to Which Fracture x
2.2.2.1. Implementing One 200GbE-4 Interface with 400G Hard IP and FHT 2.2.2.2. Implementing One 200GbE-2 Interface with 400G Hard IP and FHT 2.2.2.3. Implementing One 100GbE-1 Interface with 400G Hard IP and FHT 2.2.2.4. Implementing One 100GbE-4 Interface with 400G Hard IP and FGT 2.2.2.5. Implementing One 10GbE-1 Interface with 200G Hard IP and FGT 2.2.2.6. Implementing Three 25GbE-1 Interfaces with 400G Hard IP and FHT 2.2.2.7. Implementing One 50GbE-1 and Two 25GbE-1 Interfaces with 400G Hard IP and FHT 2.2.2.8. Implementing One 100GbE-1 and Two 25GbE-1 Interfaces with 400G Hard IP and FHT 2.2.2.9. Implementing Two 100GbE-1 and One 25GbE-1 Interfaces with 400G Hard IP and FHT 2.2.2.10. Implementing 100GbE-1, 100GbE-2, and 50GbE-1 Interfaces with 400G Hard IP and FHT
2.2.5. Topologies x
2.2.5.1. Topology 5: 400G Hard IP (FHT) + 200G Hard IP (FGT) Example 2.2.5.2. Topology 6a: 400G Hard IP with Mixed Transceiver Mode Example 2.2.5.3. Topology 14: 1x PCIe x4 + 400G Hard IP (FGT) with PTP Example
2.2.8. Bonding Placement Rules x
2.2.8.1. Bonded Lanes Use Case 1 2.2.8.2. Bonded Lanes Use Case 2
2.3. PMA Architecture x
2.3.1. FHT PMA Architecture 2.3.2. FGT PMA Architecture
2.3.1. FHT PMA Architecture x
2.3.1.1. FHT Transmitter PMA Architecture 2.3.1.2. FHT Receiver PMA Architecture 2.3.1.3. FHT PMA Loopback Modes
2.3.1.1. FHT Transmitter PMA Architecture x
2.3.1.1.1. FHT Transmitter Buffer and Phase Generator 2.3.1.1.2. FHT Serializer 2.3.1.1.3. FHT Gray-Coder and Pre-Coder 2.3.1.1.4. FHT Data Pattern Generator and Verifier
2.3.1.2. FHT Receiver PMA Architecture x
2.3.1.2.1. FHT Receiver Buffer and Equalizer 2.3.1.2.2. CDR Block 2.3.1.2.3. FHT Deserializer
2.3.2. FGT PMA Architecture x
2.3.2.1. FGT Transmitter PMA Architecture 2.3.2.2. FGT Receiver PMA Architecture 2.3.2.3. FGT PMA Tuning 2.3.2.4. FGT PMA Loopback Modes
2.3.2.1. FGT Transmitter PMA Architecture x
2.3.2.1.1. FGT Transmitter Buffer and Phase Generator 2.3.2.1.2. FGT Serializer 2.3.2.1.3. FGT Gray-Coder and Pre-Coder 2.3.2.1.4. FGT Data Pattern Generator and Verifier
2.3.2.2. FGT Receiver PMA Architecture x
2.3.2.2.1. FGT Receiver Buffer and Equalizer 2.3.2.2.2. Control Unit 2.3.2.2.3. FGT Deserializer
2.4. Clock Architecture x
2.4.1. Reference Clock Network 2.4.2. Datapath Clock Network 2.4.3. System PLL 2.4.4. Datapath Clock Cadences
2.4.1. Reference Clock Network x
2.4.1.1. FHT Reference Clock Network 2.4.1.2. FGT and System PLL Reference Clock Network 2.4.1.3. FGT Primary PLL Configuration
2.4.1.2. FGT and System PLL Reference Clock Network x
2.4.1.2.1. FGT Reference Clock Receiver Analog Front End
3. Implementing the F-Tile PMA/FEC Direct PHY Intel® FPGA IP x
3.1. F-Tile PMA/FEC Direct PHY Intel® FPGA IP Overview 3.2. Designing with F-Tile PMA/FEC Direct PHY Intel® FPGA IP 3.3. Configuring the IP 3.4. Signal and Port Reference 3.5. Bit Mapping for PMA and FEC Mode PHY TX and RX Datapath 3.6. Clocking 3.7. Custom Cadence Generation Ports and Logic 3.8. Asserting Reset 3.9. Bonding Implementation 3.10. Independent Port Configurations 3.11. Configuration Registers 3.12. Configurable Quartus® Prime Software Settings 3.13. Configuring the F-Tile PMA/FEC Direct PHY Intel® FPGA IP for Hardware Testing 3.14. Hardware Configuration Using the Avalon® Memory-Mapped Interface
3.1. F-Tile PMA/FEC Direct PHY Intel® FPGA IP Overview x
3.1.1. PMA Direct Supported Modes 3.1.2. FEC Direct Supported Modes 3.1.3. Unsupported PMA/FEC Modes
3.2. Designing with F-Tile PMA/FEC Direct PHY Intel® FPGA IP x
3.2.1. Preset IP Parameter Settings
3.3. Configuring the IP x
3.3.1. General and Common Datapath Options 3.3.2. TX Datapath Options 3.3.3. RX Datapath Options 3.3.4. RS-FEC (Reed Solomon Forward Error Correction) Options 3.3.5. Avalon® Memory Mapped Interface Options 3.3.6. Register Map IP-XACT Support 3.3.7. Example Design Generation 3.3.8. Analog Parameter Options
3.3.1. General and Common Datapath Options x
3.3.1.1. FGT PMA Configuration Rules for SATA mode 3.3.1.2. FGT PMA Configuration Rules for GPON Mode
3.3.2. TX Datapath Options x
3.3.2.1. TX PMA interface Parameters
3.3.3. RX Datapath Options x
3.3.3.1. RX FGT PMA Interface Options
3.4. Signal and Port Reference x
3.4.1. TX and RX Parallel and Serial Interface Signals 3.4.2. TX and RX Reference Clock and Clock Output Interface Signals 3.4.3. Reset Signals 3.4.4. RS-FEC Signals 3.4.5. Custom Cadence Control and Status Signals 3.4.6. TX PMA Control Signals 3.4.7. RX PMA Status Signals 3.4.8. TX and RX PMA and Core Interface FIFO Signals 3.4.9. PMA Avalon® Memory Mapped Interface Signals 3.4.10. Datapath Avalon® Memory Mapped Interface Signals
3.4.10. Datapath Avalon® Memory Mapped Interface Signals x
3.4.10.1. Number of Datapath Memory Mapped Avalon® Interfaces and Additional Address Bits per Interface
3.5. Bit Mapping for PMA and FEC Mode PHY TX and RX Datapath x
3.5.1. Parallel Data Mapping Information 3.5.2. TX and RX Parallel Data Mapping Information for Different Configurations 3.5.3. Example of TX Parallel Data for PMA Width = 8, 10, 16, 20, 32 (X=1) 3.5.4. Example of TX Parallel Data for PMA width = 64 (X=2) 3.5.5. Example of TX Parallel Data for PMA width = 64 (X=2) for FEC Direct Mode
3.5.2. TX and RX Parallel Data Mapping Information for Different Configurations x
3.5.2.1. TX Parallel Data Mapping Information for SATA Protocol Mode for Different Configurations
3.6. Clocking x
3.6.1. Clock Ports 3.6.2. Recommended tx/rx_coreclkin Connection and tx/rx_clkout2 Source 3.6.3. Port Widths and Recommended Connections for tx/rx_coreclkin, tx/rx_clkout, and tx/rx_clkout2 3.6.4. FGT PMA Fractional Mode 3.6.5. FGT RX CDR Clock Output
3.6.5. FGT RX CDR Clock Output x
3.6.5.1. Dynamically Configure the FGT RX CDR Clock Output
3.7. Custom Cadence Generation Ports and Logic x
3.7.1. Enabling the tx_cadence_slow_clk_locked Port 3.7.2. Rate Match FIFO
3.8. Asserting Reset x
3.8.1. Reset Signal Requirements 3.8.2. Power On Reset Requirements 3.8.3. Reset Signals—Block Level 3.8.4. Reset Signals—Descriptions 3.8.5. Status Signals—Descriptions 3.8.6. Run-time Reset Sequence—TX 3.8.7. Run-time Reset Sequence—RX 3.8.8. Run-time Reset Sequence—TX + RX 3.8.9. Run-time Reset Sequence—TX with FEC
3.8.8. Run-time Reset Sequence—TX + RX x
3.8.8.1. Run-time Reset Sequence Approximate Time Durations
3.11. Configuration Registers x
3.11.1. PMA and FEC Direct PHY Soft CSR Register Map 3.11.2. FHT PMA Register Map 3.11.3. FGT PMA Register Map 3.11.4. FEC Register Map 3.11.5. Lane Offset Address 3.11.6. Accessing Configuration Registers
3.11.6. Accessing Configuration Registers x
3.11.6.1. Accessing PMA and FEC Direct PHY Soft CSR Registers 3.11.6.2. Accessing FHT PMA Registers 3.11.6.3. Accessing FGT PMA Registers
3.11.6.2. Accessing FHT PMA Registers x
3.11.6.2.1. FHT PMA Register Address Range 0x40000 to 0x48000 3.11.6.2.2. FHT PMA Register Address Range 0x60000 to 0xF0030 3.11.6.2.3. FHT PMA Register Address 0xFFFFC
3.11.6.3. Accessing FGT PMA Registers x
3.11.6.3.1. FGT PMA Register Address Range 0x40000 to 0x48000 3.11.6.3.2. FGT PMA Register Address Range 0x62000 to 0x62004 3.11.6.3.3. FGT PMA Register Address Range 0x9003C to 0xF0028 3.11.6.3.4. FGT PMA Register Address 0xFFFFC
3.12. Configurable Quartus® Prime Software Settings x
3.12.1. FHT PMA Settings 3.12.2. FGT PMA Settings
3.13. Configuring the F-Tile PMA/FEC Direct PHY Intel® FPGA IP for Hardware Testing x
3.13.1. Using Debug Endpoint Interface within the F-Tile PMA/FEC Direct PHY Intel® FPGA IP 3.13.2. Using JTAG to Avalon® Master Bridge Intel FPGA IP
3.13.1. Using Debug Endpoint Interface within the F-Tile PMA/FEC Direct PHY Intel® FPGA IP x
3.13.1.1. RTL Connection Example for Debug Endpoint Avalon® Interface
3.13.2. Using JTAG to Avalon® Master Bridge Intel FPGA IP x
3.13.2.1. RTL Connection Example for JTAG to Avalon® Master Bridge Intel IP
3.14. Hardware Configuration Using the Avalon® Memory-Mapped Interface x
3.14.1. FHT PMA 3.14.2. FGT PMA
3.14.1. FHT PMA x
3.14.1.1. Enabling Loopback 3.14.1.2. Enabling the PRBS Generator and Verifier for ES Devices 3.14.1.3. Obtaining BER Values for Production Devices 3.14.1.4. TX Equalizer Settings 3.14.1.5. TX Error Injection 3.14.1.6. RX Reconvergence 3.14.1.7. Preserving Unused Lanes
3.14.2. FGT PMA x
3.14.2.1. Direct Register Method 3.14.2.2. FGT Attribute Access Method
3.14.2.1. Direct Register Method x
3.14.2.1.1. Direct Register Method Examples
3.14.2.2. FGT Attribute Access Method x
3.14.2.2.1. FGT Attribute Access Method Example 1 3.14.2.2.2. FGT Attribute Access Method Example 2 3.14.2.2.3. FGT Attribute Access Method Example 3
4. Implementing the F-Tile Reference and System PLL Clocks Intel® FPGA IP x
4.1. IP Parameters 4.2. IP Port List 4.3. Mode of System PLL - System PLL Reference Clock and Output Frequencies 4.4. Guidelines for F-Tile Reference and System PLL Clocks Intel® FPGA IP Usage 4.5. Guidelines for Refclk #i is Active At and After Device Configuration 4.6. Guidelines for Obtaining the Lock Status and Resetting the FGT and FHT TX PLLs
4.5. Guidelines for Refclk #i is Active At and After Device Configuration x
4.5.1. Guidelines for System PLL Reference Clock 4.5.2. Guidelines for FGT Reference Clock
4.6. Guidelines for Obtaining the Lock Status and Resetting the FGT and FHT TX PLLs x
4.6.1. How to Read the Real-Time Lock Status of the FGT TX PLL 4.6.2. How to Read the Real-Time Lock Status of the FHT Lane TX PLL 4.6.3. How to Read the Real-Time Lock Status of the FHT Common TX PLL 4.6.4. How to Reset the FGT TX PLL 4.6.5. How to Reset the FHT Lane TX PLL and Common PLL
4.6.1. How to Read the Real-Time Lock Status of the FGT TX PLL x
4.6.1.1. How to Determine the TX PLL Your FGT Channel is Using
4.6.3. How to Read the Real-Time Lock Status of the FHT Common TX PLL x
4.6.3.1. How to Determine Which Common PLL Your FHT Channel is Using
5. F-Tile PMA/FEC Direct PHY Design Implementation x
5.1. Implementing the F-Tile PMA/FEC Direct PHY Design 5.2. Instantiating the F-Tile PMA/FEC Direct PHY Intel® FPGA IP 5.3. Implementing a RS-FEC Direct Design in the F-Tile PMA/FEC Direct PHY Intel® FPGA IP 5.4. Instantiating the F-Tile Reference and System PLL Clocks Intel® FPGA IP 5.5. Enabling Custom Cadence Generation Ports and Logic 5.6. Connecting the F-Tile PMA/FEC Direct PHY Design IP 5.7. Simulating the F-Tile PMA/FEC Direct PHY Design 5.8. F-Tile Interface Planning
5.2. Instantiating the F-Tile PMA/FEC Direct PHY Intel® FPGA IP x
5.2.1. Setting General and Common Datapath Options 5.2.2. Setting TX Datapath Options 5.2.3. Setting RX Datapath Options
5.7. Simulating the F-Tile PMA/FEC Direct PHY Design x
5.7.1. PAM4 Encoding Schemes in Simulation
5.8. F-Tile Interface Planning x
5.8.1. F-Tile Interface Planner Usage Example
6. Supported Tools x
6.1. F-Tile Channel Placement Tool 6.2. F-Tile PMA and FEC Direct Port Mapping Calculator 6.3. F-Tile Clocking and Datapath Tool 6.4. F-Tile FGT TX Equalizer Tool
7. Debugging F-Tile Transceiver Links x
7.1. F-Tile Transceiver Toolkit GUI 7.2. F-Tile Transceiver Debugging Flow Walkthrough 7.3. Transceiver Toolkit Parameter Settings 7.4. Using F-Tile Multirate IPs with Transceiver Toolkit 7.5. Troubleshooting Common Errors 7.6. Transceiver Toolkit Scripts
7.1. F-Tile Transceiver Toolkit GUI x
7.1.1. Collection View
7.2. F-Tile Transceiver Debugging Flow Walkthrough x
7.2.1. Modifying the Design to Enable F-Tile Transceiver Debug 7.2.2. Programming the Design into an Intel FPGA 7.2.3. Loading the Design to the Transceiver Toolkit 7.2.4. Creating Transceiver Links 7.2.5. Running BER Tests 7.2.6. Running Eye Viewer Tests 7.2.7. Running Link Optimization Tests 7.2.8. Checking FEC Statistics 7.2.9. Vertical Bathtub Curve Measurements (VBCM) Data
7.3. Transceiver Toolkit Parameter Settings x
7.3.1. Dashboard
7.4. Using F-Tile Multirate IPs with Transceiver Toolkit x
7.4.1. F-Tile PMA/FEC Direct PHY Multirate Intel FPGA IP 7.4.2. F-Tile Ethernet Multirate Intel FPGA IP 7.4.3. Ethernet Subsystem Intel FPGA IP
7.6. Transceiver Toolkit Scripts x
7.6.1. Supported Transceiver Toolkit Scripts 7.6.2. Modifying the Scripts 7.6.3. Script Execution 7.6.4. Example of the Results in Tcl Console
A. Appendix x
A.1. Agilex™ 7 F-Tile OPNs A.2. OSC_CLK_1 QSF Assignment Requirement A.3. FGT Internal Serial Loopback Calibration Sequence for RX Manual Adaptation
1. F-Tile Overview
2. F-Tile Architecture
3. Implementing the F-Tile PMA/FEC Direct PHY Intel® FPGA IP
4. Implementing the F-Tile Reference and System PLL Clocks Intel® FPGA IP
5. F-Tile PMA/FEC Direct PHY Design Implementation
6. Supported Tools
7. Debugging F-Tile Transceiver Links
8. F-Tile Architecture and PMA and FEC Direct PHY IP User Guide Archives
9. Document Revision History for the F-Tile Architecture and PMA and FEC Direct PHY IP User Guide
A. Appendix

7.3. Transceiver Toolkit Parameter Settings

The following table describes the transceiver toolkit parameter settings.
Table 119.  Transceiver Toolkit Parameter Settings
Parameter Description Control Pane
Auto refresh RX CDR status Enable this option to update the RX CDR status real time. Receiver pane.
Auto refresh RX PMA settings Enable this option to update the RX Equalization settings real time for FGT PMA. Receiver pane.
Auto refresh TX Status Enable this option to update the TX PLL lock status real time. Transmitter pane
Bit error rate (BER) Reports the number of errors divided by bits tested since the last reset of the checker. When RX CDR is locked to reference clock or PRBS checker is not locked, the BER reported is not reliable. Receiver pane
Clear Stats Clear the current number of bits tested, number of error bits and BER. Receiver pane
Hard PRBS checker running

Not Running: checker stops.

Running: checker is checking, and data pattern is locked.

 Receiver pane
Hard PRBS generator running

Not Running: generator stops.

Running: generator is sending a pattern.

 Transmitter pane
Inject Error Inject a bit error in the transmitter PRBS pattern. Transmitter pane
Line encoding Specifies the modulation type used for serial data. Transmitter and receiver pane
Loopback mode Select the loopbacks mode. The available options are:
  • RX2TXPAR - PMA-receiver-to-transmitter parallel loopback
  • TX2RXPAR - PMA-transmitter-to-receiver parallel loopback
  • TX2RXBUF - PMA-transmitter-to-receiver buffer loopback
 Transmitter and receiver pane
Number of bits tested Specifies the number of bits tested since the last reset of the checker. When RX CDR is locked to reference clock or PRBS checker is not locked, the BER reported is not reliable Receiver pane
Number of error bits Specifies the number of error bits encountered since the last reset of the checker. When RX CDR is locked to reference clock or PRBS checker is not locked, the BER reported is not reliable Receiver pane
PRBS locked Locked: indicates the PRBS checker is locked to the received PRBS pattern.

Not Locked: indicates the PRBS checker is not locked to the received PRBS pattern.

 Receiver pane
PRBS pattern Select the test pattern for the bit error test. Transmitter and receiver pane
RX CDR locked to ref clock Locked: Indicates the receiver CDR is in lock-to-reference (LTR) mode.

Not Locked: Indicates the receiver CDR is not locked to reference clock.

Don't Care: When the receiver CDR is in LTD mode.

 Receiver pane
RX CDR locked to data Locked: Indicates the receiver CDR is in lock-to-data (LTD) mode.

Not Locked: Indicates the receiver CDR is not locked to incoming data.

 Receiver pane
RX Enable Gray Code Enables Gray coding for PAM4 only. Receiver pane
RX PMA Settings RX Equalization settings. Receiver pane
RX Polarity Inversion Enable RX polarity inversion. Receiver pane
RX Ready Ready: RX channel out of reset and CDR locks to data.

Not Ready: RX channel in reset or CDR is not locked to data.

 Receiver pane
RX Reset FGT PMA Reset the FGT RX datapath.
Note: Clicking the RX reset of one channel resets all the RX channels in the same F-Tile PMA/FEC Direct PHY Intel® FPGA IP instance.
Receiver pane
High Frequency VGA Gain Options for the RX EQ VGA gain value, in 1.0 step size increments. Receiver Pane
High Frequency Boost Options for the RX EQ high frequency boost value, in 1.0 step size increments. Receiver Pane
DFE Data Tap1 Options for RX EQ DFE data tap1 value, in 1.0 step size increments. Receiver Pane
Auto refresh RX PMA settings above Enable this option to automatically update the RX PMA settings in real time. Receiver Pane
Save Eye data as CSV Set the file path to save the eye viewer data. Receiver Pane
Eye Width Enable this option for measurement of eye width. Receiver Pane
Eye Height Enable this option for measurement of eye height. Receiver Pane
Bit error rate to measure Eye Height Sets the Bit Error Rate to measure eye height. Receiver Pane
Bit error rate to measure Eye Width Sets the Bit Error Rate to measure eye width. Receiver Pane
Start Eye Viewer Starts the Eye Viewer measurements. Receiver Pane
Eye Height (VBCM) Enable this option for VBCM data measurement of eye height. Receiver Pane
Eye Width (VBCM) Enable this option for VBCM data measurement of eye width. FGT PMA only. Receiver Pane
Bit error rate for Eye Height Sets the Bit Error Rate to measure eye height. Receiver Pane
Bit error rate for Eye Width Sets the Bit Error Rate to measure eye width. FGT PMA only. Receiver Pane
Export VBCM data to XLSX Exports the VBCM data to the set working directory. Receiver Pane
Start Starts the pattern generator or checker on the channel to verify incoming data. Transmitter and receiver pane
Stop Stops generating patterns and testing the channel. Transmitter and receiver pane
TX Enable Gray Code Enables Gray coding for PAM4 only. Transmitter pane
TX Equalization Parameters FGT 49 FHT 50 51 Transmitter pane and receiver pane

Post_tap_1

Main_tap

Pre_tap_1

Pre_tap_2

C-3: Pre-cursor 3

C-2: Pre-cursor 2

C-1: Pre-cursor 1

C0: Main cursor

C+1: Post-cursor 1

C+2: Post-cursor 2

C+3: Post-cursor 3

C+4: Post-cursor 4

TX PLL Locked Locked: Indicates TX PLL locks to reference clock. Transmitter pane
TX Polarity Inversion Enable TX polarity inversion. Transmitter pane
TX Reset FGT PMA Reset the FGT TX PMA datapath.
Note: Clicking the TX reset of one channel resets all the TX channels in the same F-Tile PMA/FEC Direct PHY Intel® FPGA IP instance.
Transmitter pane

Section Content
Dashboard

Related Information
49 Refer to F-Tile TX Equalizer Tool for legal settings.
50 Refer to FHT PMA Architecture for legal settings.
51 When internal serial loopback is enabled, the TX Equalization Parameters are set to default values.
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