Ethernet Link Inspector User Guide for Intel® Stratix® 10 Devices

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ID 683367
Date 7/01/2019
Public
Document Table of Contents
Document Table of Contents x
1. Overview of Ethernet Link Inspector for Intel® Stratix® 10 Devices 2. Setting Up the Ethernet Link Inspector 3. Functional Description 4. Ethernet Link Inspector User Guide Archives 5. Document Revision History for the Ethernet Link Inspector User Guide for Intel® Stratix® 10 Devices
1. Overview of Ethernet Link Inspector for Intel® Stratix® 10 Devices x
1.1. Features 1.2. Supported IP Cores and Devices
1.1. Features x
1.1.1. Link Monitor 1.1.2. Link Analysis
2. Setting Up the Ethernet Link Inspector x
2.1. System Requirements and Prerequisites 2.2. Running the Ethernet Link Inspector
2.1. System Requirements and Prerequisites x
2.1.1. System Requirements 2.1.2. Enabling Your Design For the Link Monitor
2.2. Running the Ethernet Link Inspector x
2.2.1. Running the Link Monitor 2.2.2. Running the Link Analysis
2.2.2. Running the Link Analysis x
2.2.2.1. Creating and Capturing Signal Tap File and Exporting Signal Tap Database as CSV File
3. Functional Description x
3.1. Link Monitor Module 3.2. Link Analysis Module
3.1. Link Monitor Module x
3.1.1. Link Monitor Tabs and Settings
3.2. Link Analysis Module x
3.2.1. Sequencer State Machine 3.2.2. Link Analysis Tabs and Settings
3.2.2. Link Analysis Tabs and Settings x
3.2.2.1. Sequencer State Machine Tab 3.2.2.2. Auto Neg Tab 3.2.2.3. Link Training Tab LT Communication Packets 3.2.2.4. Data Mode Tab 3.2.2.5. Help Tab
1. Overview of Ethernet Link Inspector for Intel® Stratix® 10 Devices
2. Setting Up the Ethernet Link Inspector
3. Functional Description
4. Ethernet Link Inspector User Guide Archives
5. Document Revision History for the Ethernet Link Inspector User Guide for Intel® Stratix® 10 Devices

3.2.2.3. Link Training Tab

The Link Training Mode tab may have one or more subtabs based on number of times the device go into Link Training (LT) state during the Signal Tap capture in a finite amount of time. Each subtab displays the Ethernet link behavior during the occurrence of LT. Each LT occurrence is also prefixed with a number to distinguish between various LT occurrences.

Table 11.  Local Device Status Signals
Name Signal 7 Indication Description
Link Training Enable lt_enable LED
  • Green: LT is enabled.
  • Red: LT is disabled.
Frame Lock frame_lock LED
  • Green: Detected and locked from receiving LT packets. Also shows the timestamp of lock.
  • Red: Not locked from receiving LT packets.
RX Trained rx_trained LED
  • Green: LT completed.
  • Red: LT not completed.
Local RX Ready lcl_rx_ready LED This signal is a delayed version of rx_trained signal.
  • Green: LT completed.
  • Red: LT not completed.
Link Training commands sent by Local Device rmt_coef_updl, rmt_coef_updh — —
Init — Label Indicates the total Initialize commands sent.
Preset — Label Indicates the total Preset commands sent.
Main Incr — Label Indicates the total main-tap increment commands sent.
Main Dec — Label Indicates the total main-tap decrement commands sent.
Post-Tap Incr — Label Indicates the total post-tap increment commands sent.
Post-Tap Dec — Label Indicates the total post-tap decrement commands sent.
Pre-Tap Incr — Label Indicates the total pre-tap increment commands sent.
Pre-Tap Dec — Label Indicates the total pre-tap decrement commands sent.
Table 12.  Remote Device Status Signals
Name Signal 8 Indication Description
Remote RX Ready rmt_rx_ready LED
  • Green: LT completed.
  • Red: LT not completed.
Link Training commands sent by Remote Device lcl_coefh, lcl_coefl — —
Init — Label Indicates the total Initialize commands sent.
Preset — Label Indicates the total Preset commands sent.
Main Incr — Label Indicates the total main-tap increment commands sent.
Main Dec — Label Indicates the total main-tap decrement commands sent.
Post-Tap Incr — Label Indicates the total post-tap increment commands sent.
Post-Tap Dec — Label Indicates the total post-tap increment commands sent.
Pre-Tap Incr — Label Indicates the total pre-tap increment commands sent.
Pre-Tap Dec — Label Indicates the total pre-tap decrement commands sent.
Table 13.  Link Training Status Signals
Signal Indication Description
frame_lock Waveform Displays the behavior of frame_lock in a time domain. When asserted, it indicates that the local device locked to LT packets. This is a waveform representation of the Frame Lock signal in the Table 11.
rx_trained Waveform Displays the behavior of rx_trained in a time domain. When asserted, it indicates that the local device completed LT. This is a waveform representation of the RX Trained signal in the Table 11.
lcl_rx_ready Waveform Displays the behavior of lcl_rx_ready in a time domain. When asserted, it indicates that the local device completed LT. This is a waveform representation of the Local RX Ready signal in the Table 11.
rmt_rx_ready Waveform Displays the behavior of rmt_rx_ready in a time domain. When asserted, it indicates that the remote device completed LT. This is a waveform representation of the Remote RX Ready signal in the Table 12.

LT Communication Packets

The LT Communication Packets section displays the LT packets exchanged between two devices. The LT Communication packets option has to be enabled to start plotting LT packets. A timestamp header is stored with each packet with respect to the reference timer. The transaction of the LT packet plotting may take a few minutes based on the number of packets that are being exchanged. To determine whether the plotting is completed or still in progress, monitor the status bar.

Figure 11. LT Communication Packet Exchange between Local Device and Remote Device
If the LT Communication Packets option is checked, the following subsections will be displayed on the tab-window of the Link Training:
  1. Commands sent by Remote Device (signals: lcl_coefh, lcl_coefl)
  2. Status to Remote Device (signals: lcl_coef_sts)
  3. Commands sent by Local Device (signals: rmt_coef_updl, rmt_coef_updh)
  4. Status to Local Device (signals: rmt_coef_sts)

For every command sent by the local or remote device, there is an equivalent status being sent back by the receiver end. The status corresponding to every command can be mapped by monitoring their time stamps, as shown in the following figure:

Figure 12. LT Training SequenceThis figure shows the timestamps corresponding to Command1 (C1) -> Status1 (S1) and Command2 (C2) -> Status2 (S2) represents the time taken by taken by either device to respond to the LT commands.
Table 14.  Link Training Command Definitions
Command Description
Post- Decreases post-tap by 2 and increases main-tap by 1.
Post+ Increases post-tap by 2 and decreases main-tap by 1.
Main- Decreases main-tap by 1.
Main+ Increases main-tap by 1.
Pre- Decreases pre-tap by 2 and increases main-tap by 1
Pre+ Increases pre-tap by 2 and decreases main-tap by 1
Hold Do not change any tap values.
Preset Sets pre-tap and post-tap to zero and main-tap to maximum, as defined in Clause 72 of the IEEE 802.3 2015 Standard.
Initialize Sets the coefficients back to initial (start) values configured in the IP core.

The following figure shows the direction in which the digital values of main-tap, post-tap, and pre-tap move based on commands. For more details on these values, refer to the Intel® Stratix® 10 L- and H-Tile Transceiver PHY User Guide.

Figure 13. Direction of Main-Tap, Post-Tap, and Pre-Tap Based On Link Training Commands
Table 15.  Status Definitions
Status Description
no upd No taps updated.
Post-upd Post-tap updated. This status is valid for both increment and decrement command
Post-max Post-tap incremented and is at maximum value
Post-min Post-tap decremented and is at minimum value
Pre-upd Pre-tap updated. This status is valid for both increment and decrement command
Pre-max Pre-tap incremented and is at maximum value.
Pre-min Pre-tap decremented and is at minimum value.
Main-upd Main-tap updated. This status is valid for both increment and decrement command.
Main-max Main-tap incremented and is at maximum value.
Main-min Main-tap decremented and is at minimum value.
Note: If the command or status shows "----", this indicates that the values in the LT packet are invalid.
Related Information
7 All the descriptions in Table 11 are with reference to local device.
8 All the descriptions in Table 12 are with reference to remote device.
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