Ethernet Subsystem Intel® FPGA IP User Guide: Early Access Customer Release

ID 773413
Date 4/14/2023

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4.1.13. disable_loopback for F-Tile

Issuing the disable_loopback SAL command disables the serial loopback mode on FGT and FHT PMA (port 0 - 15). Below are the CSR sequences carried out by NIOS FW to disable serial loopback for F-tile transceiver PMA.

For FHT PMA (port 16 - 19),

  • Assert rx_reset.
  • Write 1'b1 to 0x45800[14] CSR register bit to enable serial internal loopback.
  • Deassert rx_reset.

For FGT PMA (port 0 - 15),

  • Assert rx_reset.
  • Write 1'b0 to register 0x4781C bit 1 to disable serial loopback
  • Deassert rx_reset.