Unicast Address Word Lower Register - 7.2 English

AXI 1G/2.5G Ethernet Subsystem Product Guide (PG138)
Document ID
PG138
Release Date
2023-11-15
Version
7.2 English

The Unicast Address Word Lower (UAWL) register is shown in the following figure. This register and the Unicast Address Word Upper (UAWU) register are only used when extended multicast filtering is included in the subsystem at build-time (C_MCAST_EXTEND = 1) and is enabled. These registers should not be confused with the UAW0 and UAW1 registers which are registers inside the TEMAC core which are only used when extended multicast filtering is excluded in the subsystem at build-time or is disabled .

Important: When using extended multicast filtering, the TEMAC core must be placed in promiscuous address filtering mode.

This register allows filtering of unicast frames not matching the address stored in these registers. See Extended Multicast Address Filtering Mode for more information.

Figure 1. Unicast Address Word Lower Register (0x020) AXI Ethernet Page-1 Sheet.1 X14034 X14034 Sheet.2 MSB MSB Sheet.3 LSB LSB Sheet.4 Sheet.11 UnicastAddr(31:0) UnicastAddr(31:0) Sheet.17 0 0 Sheet.18 31 31 Standard Arrow.8

The following table shows the Unicast Address Word Lower register bit definitions.

Table 1. Unicast Address Word Lower Register (0x020)
Bits Name Access Reset Value Description
31:0 UnicastAddr R/W 0x00000000 Unicast Address [31:0]: This address is used to match against the destination address of any received frames.

The address is ordered so the first byte transmitted/received is the lowest positioned byte in the register; for example, an Ethernet MAC address of AA-BB-CC-DD-EE-FF would be stored in UnicastAddr(47:0) as 0xFFEEDDCCBBAA.