NO_PREAMBLE

The background and motivation for this hidden option are tracked in SIP-421. Possible values:

  • 0 – Normal operation
  • 1 – No preamble and no SFD in the received frame
  • 2 – No preamble in the received frame

In SGMII mode, when NO_PREAMBLE = 2, the SFD is removed by the byte_shift module before entering the rx_ctr module. This approach reduces design complexity.