Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide

ID 683426
Date 11/17/2023

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5.3. Primary MAC Address

Table 24.  Primary MAC Address
Word Offset Register Name Description Access HW Reset Value
0x0010 primary_mac_addr0 6-byte primary MAC address. Configure this register with a non-zero value before you enable the MAC IP core for operations.

Map the primary MAC address as follows:

  • primary_mac_addr0: Lower four bytes of the address.
  • primary_mac_addr1[15:0]: Upper two bytes of the address.
  • primary_mac_addr1[31:16]: Reserved.

If the primary MAC address is 00-1C-23-17-4A-CB, set primary_mac_addr0 to 0x23174ACB and primary_mac_addr1 to 0x0000001C.


On transmit, the MAC IP core uses this address to fill the source address field in control frames. For data frames from the client, the MAC IP core replaces the source address field with the primary MAC address when the tx_src_addr_override register is set to 1.

On receive, the MAC IP core uses this address to filter unicast frames when the EN_ALLUCAST bit of the rx_frame_control register is set to 0. The MAC IP core drops frames whose destination address is different from the value of the primary MAC address.

RW 0x0
0x0011 primary_mac_addr1