Ethernet Media Access Controller (EMAC)/ Management Data Input/Output (MDIO) Module User's Guide

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5.44 MAC Address High Bytes Register (MACADDRHI)
5.45 MAC Index Register (MACINDEX)
Ethernet Media Access Controller (EMAC) Registers
The MAC address high bytes register (MACADDRHI) is shown in Figure 84 and described in Table 83 .
Figure 84. MAC Address High Bytes Register (MACADDRHI)
31 24 23 16
MACADDR2 MACADDR3
R/W-0 R/W-0
15 8 7 0
MACADDR4 MACADDR5
R/W-0 R/W-0
LEGEND: R/W = Read/Write; - n = value after reset
Table 83. MAC Address High Bytes Register (MACADDRHI) Field Descriptions
Bit Field Value Description
31-24 MACADDR2 0-FFh MAC source address bits 23-16 (byte 2)
23-16 MACADDR3 0-FFh MAC source address bits 31-24 (byte 3)
15-8 MACADDR4 0-FFh MAC source address bits 39-32 (byte 4)
7-0 MACADDR5 0-FFh MAC source address bits 47-40 (byte 5). Bit 40 is the group bit. It is forced to 0 and read as 0.
Therefore, only unicast addresses are represented in the address table.
The MAC index register (MACINDEX) is shown in Figure 85 and described in Table 84 .
Figure 85. MAC Index Register (MACINDEX)
31 16
Reserved
R-0
15 3 2 0
Reserved MACINDEX
R-0 R/W-0
LEGEND: R = Read only; R/W = Read/Write; - n = value after reset
Table 84. MAC Index Register (MACINDEX) Field Descriptions
Bit Field Value Description
31-3 Reserved 0 Reserved
2-0 MACINDEX 0-7h MAC address index. The host must write the index into the RX ADDR RAM in the MACINDEX field,
followed by the upper 32-bits of address, followed by the lower 16-bits of address (with control bits). The
53-bit indexed RAM location is written when the low location is written. All 32 address RAM locations
must be initialized prior to enabling packet reception.
SPRUEQ6 – December 2007 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) 121
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