3.3.3.1.3. Run-time Reset Sequence—TX + RX - 2025-12-15

F-Tile Low Latency Ethernet 10G MAC IP Design Example User Guide
Version
24.3.1
Figure 13. Reset Sequence
The following steps describe IP core reset sequence as shown in the waveform.
  1. Drive the i_rst_n reset signal high while i_tx_rst_n and i_rx_rst_n reset signals are already deasserted.
  2. The o_rst_ack_n reset signal deasserts. This indicates that the IP core is no longer in the full reset.
    Note: This step doesn't indicate that the IP core is in fully functional state.
    Note: The o_tx_rst_ack_n and o_rx_rst_ack_n reset signals also deassert. The exact sequence and timing is not guaranteed.
  3. The IP core is fully out of reset. Assert o_tx_lanes_stable and o_rx_pcs_ready to indicate that the TX and RX datapaths are ready for use.
  4. Assert the i_tx_rst_n reset signal.
  5. The o_tx_lanes_stable signal deasserts to indicate that the TX datapath is no longer operational.
  6. The o_tx_rst_ack_n signal asserts indicating that the TX datapath is fully in reset. Then, deassert the i_tx_rst_n signal to bring the TX datapath out of the reset.
  7. Assert the i_rx_rst_n reset signal.
  8. The o_rx_pcs_ready signal deasserts to indicate that the RX datapath is no longer operational.
  9. The o_rx_rst_ack_n signal asserts indicating that the RX datapath is fully in reset. Then, deassert the i_rx_rst_n signal to bring the RX datapath out of the reset.
  10. Assert the i_rst_n reset signal.
  11. The o_tx_lanes_stable and o_rx_pcs_ready signals deassert to indicate that TX and RX datapath are no longer operational.
  12. The o_rst_ack_n signals assert to indicate the IP core is fully in reset. To bring the IP core out of the reset, deassert the i_rst_n reset signal.