F-Tile Ethernet Intel® FPGA Hard IP User Guide

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ID 683023
Date 1/07/2022
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Document Table of Contents
Document Table of Contents x
1. Overview 2. Getting Started 3. F-Tile Ethernet Intel® FPGA Hard IP Parameters 4. Functional Description 5. Clocks 6. Resets 7. Interface Overview 8. Configuration Registers 9. Supported Modules and IPs 10. Supported Tools 11. F-Tile Ethernet Intel® FPGA Hard IP User Guide Archives 12. Document Revision History
1. Overview x
1.1. Ethernet System in F-Tile Overview 1.2. F-Tile Ethernet Intel® FPGA Hard IP Overview
1.2. F-Tile Ethernet Intel® FPGA Hard IP Overview x
1.2.1. Device Family Support 1.2.2. Device Speed Grade Support 1.2.3. Resource Utilization 1.2.4. Release Information
2. Getting Started x
2.1. Installing and Licensing F-Tile Ethernet Intel® FPGA Hard IP Cores 2.2. Specifying the IP Core Parameters and Options 2.3. Reference and System PLL Clock for your IP Design 2.4. Generated File Structure 2.5. Generating Tile Files 2.6. IP Core Testbenches
4. Functional Description x
4.1. Datapath Description 4.2. F-Tile Ethernet Intel® FPGA Hard IP MAC 4.3. PCS, OTN, and FlexE Modes 4.4. Precision Time Protocol 4.5. Auto-Negotiation and Link Training
4.2. F-Tile Ethernet Intel® FPGA Hard IP MAC x
4.2.1. MAC TX Datapath 4.2.2. MAC RX Datapath 4.2.3. Congestion and Flow Control Using PAUSE or Priority Flow Control (PFC) 4.2.4. Link Fault Signaling 4.2.5. Order of Ethernet Transmission
4.2.1. MAC TX Datapath x
4.2.1.1. TX Preamble, Start, and SFD Insertion 4.2.1.2. Source Address Insertion 4.2.1.3. Length/Type Field Processing 4.2.1.4. Frame Padding 4.2.1.5. Frame Check Sequence (CRC-32) Insertion 4.2.1.6. Inter-Packet Gap Generation and Insertion
4.2.2. MAC RX Datapath x
4.2.2.1. RX Preamble Processing 4.2.2.2. RX Strict SFD Checking 4.2.2.3. RX FCS Checking 4.2.2.4. RX Malformed Packet Handling 4.2.2.5. Removing PAD Bytes and FCS Bytes from RX Frames 4.2.2.6. RX Undersized Frames, Oversized Frames, and Frames with Length Errors 4.2.2.7. Inter-Packet Gap
4.2.3. Congestion and Flow Control Using PAUSE or Priority Flow Control (PFC) x
4.2.3.1. Conditions Triggering XOFF Frame Transmission 4.2.3.2. Conditions Triggering XON Frame Transmission 4.2.3.3. Pause Control and Generation Interface 4.2.3.4. Pause Control Frame Filtering
4.3. PCS, OTN, and FlexE Modes x
4.3.1. PCS Mode 4.3.2. OTN Mode 4.3.3. FlexE Mode
4.4. Precision Time Protocol x
4.4.1. Features 4.4.2. PTP Timestamp Accuracy 4.4.3. PTP Client Flow 4.4.4. RX Virtual Lane Offset Calculation for No FEC Variants 4.4.5. Virtual Lane Order and Offset Values 4.4.6. UI Adjustment 4.4.7. Reference Time Interval 4.4.8. Minimum and Maximum Reference Time (TAM) Interval for UI Measurement (Hardware) 4.4.9. UI Value and PMA Delay 4.4.10. Routing Delay Adjustment for Advanced Timestamp Accuracy Mode
4.4.3. PTP Client Flow x
4.4.3.1. PTP TX Client Flow 4.4.3.2. PTP RX Client Flow
4.4.6. UI Adjustment x
4.4.6.1. TX UI Adjustment 4.4.6.2. RX UI Adjustment
5. Clocks x
5.1. Clock Connections in Single Instance Operation 5.2. Clock Connections in Multiple Instance Operation 5.3. Clock Connections in MAC Asynchronous FIFO Operation 5.4. Clock Connections in PTP-Based Synchronous and Asynchronous Operation 5.5. Clock Connections in Synchronous Ethernet Operation 5.6. Custom Cadence
6. Resets x
6.1. Reset Signals 6.2. Reset Sequence
7. Interface Overview x
7.1. Status Interface 7.2. TX MAC Avalon ST Client Interface 7.3. RX MAC Avalon ST Aligned Client Interface 7.4. TX MAC Segmented Client Interface 7.5. RX MAC Segmented Client Interface 7.6. MAC Flow Control Interface 7.7. PCS Mode TX Interface 7.8. PCS Mode RX Interface 7.9. FlexE and OTN Mode TX Interface 7.10. FlexE and OTN Mode RX Interface 7.11. Custom Rate Interface 7.12. Reconfiguration Interfaces 7.13. Precision Time Protocol Interface
7.2. TX MAC Avalon ST Client Interface x
7.2.1. TX MAC Avalon ST Client Interface with Disabled Preamble Passthrough 7.2.2. TX MAC Avalon ST Client Interface with Enabled Preamble Passthrough 7.2.3. Using MAC Avalon ST skip_crc Signal to Control Source Address, PAD, and CRC Insertion 7.2.4. Using MAC Avalon ST i_tx_error Signal to Mark Packets Invalid
7.3. RX MAC Avalon ST Aligned Client Interface x
7.3.1. RX MAC Avalon ST Client Interface with Disabled Preamble Passthrough 7.3.2. RX MAC Avalon ST Client Interface with Enabled Passthrough and RX CRC Forwarding 7.3.3. RX MAC Adapter Limitations 7.3.4. RX MAC Avalon ST Client Interface Status
7.4. TX MAC Segmented Client Interface x
7.4.1. TX MAC Segmented Client Interface with Disabled Preamble Passthrough 7.4.2. TX MAC Segmented Client Interface with Enabled Preamble Passthrough 7.4.3. Using MAC Segmented skip_crc Signal to Control Source Address, PAD, and CRC Insertion 7.4.4. Using MAC Segmented i_tx_mac_error to Mark Packets Invalid
7.5. RX MAC Segmented Client Interface x
7.5.1. RX MAC Segmented Client Interface with Disabled Preamble Passthrough 7.5.2. RX MAC Segmented Client Interface with Enabled Passthrough and RX CRC Forwarding 7.5.3. RX MAC Segmented Client Interface Status and Errors
7.12. Reconfiguration Interfaces x
7.12.1. Ethernet Reconfiguration Interfaces 7.12.2. Transceiver Reconfiguration Interfaces
7.13. Precision Time Protocol Interface x
7.13.1. Time-of-Day Interface 7.13.2. TX 2-Step Timestamp Interface 7.13.3. TX 1-Step Timestamp Interface 7.13.4. RX Timestamp Interface 7.13.5. PTP Status Interface 7.13.6. PTP Tile Interface
7.13.3. TX 1-Step Timestamp Interface x
7.13.3.1. PTP Field Offset for 1-Step Operation
8. Configuration Registers x
8.1. Ethernet Avalon® Memory-Mapped Interface Address Space 8.2. Transceiver Avalon® Memory-Mapped Interface Address Space
8.1. Ethernet Avalon® Memory-Mapped Interface Address Space x
8.1.1. Ethernet Hard IP Core CSRs 8.1.2. FEC and Transceiver Control and Status Registers
9. Supported Modules and IPs x
9.1. F-Tile Auto-Negotiation and Link Training For Ethernet Intel® FPGA IP 9.2. PTP Tile Adapter
9.1. F-Tile Auto-Negotiation and Link Training For Ethernet Intel® FPGA IP x
9.1.1. Overview 9.1.2. Release Information 9.1.3. Functional Description 9.1.4. Parameters 9.1.5. Clocks and Resets 9.1.6. Registers
9.2. PTP Tile Adapter x
9.2.1. Overview 9.2.2. Clocks, Reset, and Interface Ports 9.2.3. PTP Asymmetry Delay Reconfiguration Interface 9.2.4. PTP Peer-to-Peer MeanPathDelay Reconfiguration Interface
10. Supported Tools x
10.1. F-Tile Channel Placement Tool 10.2. Ethernet Toolkit Overview
10.2. Ethernet Toolkit Overview x
10.2.1. Features
1. Overview
2. Getting Started
3. F-Tile Ethernet Intel® FPGA Hard IP Parameters
4. Functional Description
5. Clocks
6. Resets
7. Interface Overview
8. Configuration Registers
9. Supported Modules and IPs
10. Supported Tools
11. F-Tile Ethernet Intel® FPGA Hard IP User Guide Archives
12. Document Revision History

4.4.6.2. RX UI Adjustment

  1. Request snapshot of initial RX TAM:
    csr_write (ptp_uim_tam_snapshot.rx_tam_snapshot, 1’b1)
  2. Read snapshotted initial TAM and counter values:
    rx_tam_0_31_0 = csr_read (ptp_rx_uim_tam_info0.tam_31_0[31:0])
rx_tam_0_47_32 = csr_read (ptp_rx_uim_tam_info1.tam_47_32[15:0])
rx_tam_0_cnt   = csr_read (ptp_rx_uim_tam_info1.tam_cnt[30:16])
rx_tam_0_valid = csr_read (ptp_rx_uim_tam_info1.tam_valid[31])
    • If rx_tam_0_valid = 1, complete TAM by concatenating the initial TAM values:
      rx_tam_0 = {rx_tam_0_47_32, rx_tam_0_31_0};
    • If rx_tam_0_valid = 0, restart from Step1.
  3. Starting from time when step 1 is executed, wait for time duration as specified in section Minimum and Maximum Reference Time (TAM) Interval for UI Measurement (Hardware).
  4. Request snapshot of Nth RX TAM:
    csr_write (ptp_uim_tam_snapshot.rx_tam_snapshot, 1’b1)
  5. Read snapshotted Nth TAM and counter values:
    rx_tam_n_31_0  = csr_read (ptp_rx_uim_info0.tam_31_0[31:0])
rx_tam_n_47_32 = csr_read (ptp_rx_uim_tam_info1.tam_47_32[15:0])
rx_tam_n_cnt   = csr_read (ptp_rx_uim_tam_info1.tam_cnt[30:16])
rx_tam_n_valid = csr_read (ptp_rx_uim_tam_info1.tam_valid[31])
    Form the TAM by concatenating snapshotted Nth TAM values: 
    rx_tam_n = {rx_tam_n_47_32, rx_tam_n_31_0};
  6. Check if there was a large change to TOD value impacting TAM value:
    rx_tam_n_valid = csr_read (ptp_rx_uim_tam_info1.tam_valid[31])

    If rx_tam_n_valid = 0, restart Step 1. If you used rx_tam_n as a new rx_tam_0 and rx_tam_n_cnt as a new rx_tam_0_cnt, you can skip Step 1 and 2. Then, you can start the wait time in Step 3 when Step 4 executes.

  7. Calculation:
    1. Get TAM interval 
      rx_tam_interval = <Refer to Reference Time Interval>
rx_tam_interval_per_pl = rx_tam_interval / PL
    2. Calculate time elapsed:
      rx_tam_delta = 
   (rx_tam_n <= rx_tam_0) ? [(rx_tam_n + 10^9ns) – rx_tam_0] 
                           : (rx_tam_n – rx_tam_0)
      Per Step 3, rx_tam_0 and rx_tam_n difference must be within the expected time range.
      • If rx_tam_delta (in ms) is lesser that the minimum time value specified by Time (ms) column of and , discard the result and restart from Step 3.
      • If rx_tam_delta (in ms) is greater than the maximum value specified by Time (ms) column of and , discard the result and restart from Step 1 or Step 3 by using rx_tam_n as a new rx_tam_0.
      Note: 10^9ns = 48’h 3B9A_CA00_0000
    3. Calculate TAM count value:
      rx_tam_cnt = (rx_tam_n_cnt < rx_tam_0_cnt) ? [(rx_tam_n_cnt + 2^15) – rx_tam_0_cnt] 
									       : (rx_tam_n_cnt – rx_tam_0_cnt)
      Per Step 3, rx_tam_0 and rx_tam_n difference must be within the expected time range.
      • If rx_tam_cnt (in ms) is lesser that the minimum time value specified by Number of Count column of and , discard the result and restart from Step 3.
      • If rx_tam_cnt (in ms) is greater than the maximum value specified by Number of Count column of and , discard the result and restart from Step 1 or Step 3 by using rx_tam_n as a new rx_tam_0.
    4. Calculate UI value:
      rx_ui = (rx_tam_delta) / (rx_tam_cnt * rx_tam_interval_pl)
  8. Write the calculated UI value to IP:
    csr_write (rx_ptp_ui, rx_ui)

    Ensure the format is {4-bit nanoseconds, 28-bit fractional nanoseconds}.

  9. After first UI measurement, for every minimum TAM interval or longer duration, repeat step 1 to 8. This is to prevent time counter drift from the golden time-of-day in the system whenever the clock ppm changes.
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