Normal Frame Reception with Extension Field - 16.2 English

1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product Guide (PG047)

Document ID
Release Date
16.2 English
In accordance with the IEEE 802.3-2008, clause 36 , state machines for the 1000BASE-X PCS, gmii_rx_er can be driven High following reception of the end frame in conjunction with gmii_rxd[7:0] containing the hexadecimal value of 0x0F to signal carrier extension. This is shown in the following figure. See 1000BASE-X State Machines for more information.

This is not an error condition and can occur even for full-duplex frames.

Figure 1. GMII Normal Frame Reception with Carrier Extension