E-tile Hard IP Intel® Agilex™ Design Example User Guide: Ethernet, E-tile CPRI PHY and Dynamic Reconfiguration

ID 683860
Date 12/11/2021
Public
Document Table of Contents

4.2.2.1. 10GE/25GE MAC+PCS with RS-FEC and PTP Simulation Dynamic Reconfiguration Design Example Components

The simulation block diagram below is generated using the following settings in the IP parameter editor:
  1. Ethernet Protocol as DR Protocol.
  2. Under the 10G/25G Ethernet Protocol tab:
    1. 25G 1588PTP RS-FEC as Select DR Design.
    2. Other Development Kits as the target development kit.
Figure 32. Simulation Block Diagram for E-Tile Ethernet IP for Intel® Agilex™ FPGA 10GE/25GE with RS-FEC and PTP Dynamic Reconfiguration Design Example

The successful test displays the dynamic reconfiguration transition flow between various modes. Use preset HEX file provided for each design example or modify provided C code to enable specific transition simulation. For more information on HEX file, refer to Simulating the E-Tile Dynamic Reconfiguration Design Example Testbench.

To test a specific transition, reorder the dynamic reconfiguration transition flow tests in the main.c file and regenerate a new HEX file. Each test describes a transition from the starting rate to the destination rate.

This is the default simulation test sequence based on the provided HEX file.
  1. Toggle sl_tx_rst_n and sl_rx_rst_n reset signals.
  2. Link Initialization. For more information, refer to Performing the Link Initialization.
  3. Dynamic reconfiguration (DR) test from 25G PTP with RS-FEC to 25G PTP without RS-FEC
  4. DR test from 25G PTP without RS-FEC to 10G PTP
  5. DR test from 10G PTP to 25G PTP without RS-FEC
  6. DR test from 25G PTP without RS-FEC to 25G PTP with RS-FEC
  7. DR test from 25G PTP with RS-FEC to 10G PTP
  8. DR test from 10G PTP to 25G PTP with RS-FEC
Each of the dynamic reconfiguration tests follows these steps:
  1. Assert sl_tx_rst_n and sl_rx_rst_n reset signals.
  2. Disable SERDES. Use PMA attribute code 0x0001 in the E-tile Transceiver PHY User Guide: PMA Attribute Codes section.
  3. Trigger PMA analog reset. For more information about register descriptions, refer to the E-tile Transceiver PHY User Guide.
  4. Change transceiver TX bit/refclk ratio to the destination rate. The refclk is 156.25 MHz.
  5. Change transceiver RX bit/refclk ratio to the destination rate. The refclk is 156.25 MHz.
  6. Reconfigure the following registers for the Ethernet, RS-FEC, and transceiver blocks. For more information about the details of the changed register values, refer to the c3_reconfig.c file. For more information about the register descriptions, refer to the E-tile Hard IP for Ethernet and CPRI PHY Intel® FPGA IPs User Guide.
  7. Adjust the phase offset of a recovered clock. Use PMA attribute code 0x000E in the E-tile Transceiver PHY User Guide: PMA Attribute Codes section.
  8. Enable SERDES. Use PMA attribute code 0x0001 in the E-tile Transceiver PHY User Guide: PMA Attribute Codes section.
  9. Enable internal serial loopback. Use PMA attribute code 0x0008 in the E-tile Transceiver PHY User Guide: PMA Attribute Codes section.
  10. Deassert sl_tx_rst_n and sl_rx_rst_n reset signals.
  11. Wait for PIO_OUT[4:0] = 0x1F (o_sl_rx_ptp_ready, o_sl_rx_pcs_ready, o_sl_rx_block_lock, and o_ehip_ready asserted).
  12. Clear Ethernet statistic counters.
  13. Enable the packet generator to start sending packets of data.
  14. Check for checker_pass status and waiting for PIO_OUT[3:0] = 0xF (checker_pass, o_sl_rx_pcs_ready, o_sl_rx_block_lock, and o_ehip_ready asserted).
The following sample output illustrates a successful simulation test run for a 25GE MAC+PCS with RS-FEC and PTP IP core variation.
# CPU is alive!
# INFO:  PKT_RX_CNT received = 10
# INFO:  PKT_RX_CNT received = 20
# INFO:  PKT_RX_CNT received = 30
# INFO:  PKT_RX_CNT received = 40
# INFO:  PKT_RX_CNT received = 50
# INFO:  PKT_RX_CNT received = 60
# INFO:  PKT_RX_CNT received = 70
# End of test
# Nios has completed its transactions          4794387104
# Simulation PASSED          4794387104
# ** Note: $finish    : ./../basic_avl_tb_top.sv(587)
#    Time: 4794387104 ps  Iteration: 9  Instance: /basic_avl_tb_top

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