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5.43 MAC Address Low Bytes Register (MACADDRLO)
EMAC Port Registers
The MAC address low bytes register (MACADDRLO) is shown in Figure 71 and described in Table 71 .
Figure 71. MAC Address Low Bytes Register (MACADDRLO)
31 21 20 19 18 16
Reserved VALID MATCH CHANNEL
FILT
R-0 R/W-x R/W-x R/W-x
15 8 7 0
MACADDR0 MACADDR1
R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 71. MAC Address Low Bytes Register (MACADDRLO) Field Descriptions
Bit Field Value Description
31-21 Reserved 0 Reserved
20 VALID Address valid bit. This bit should be cleared to zero for unused address RAM locations.
0 Address location is not valid and will not be used in determining whether or not an incoming packet
matches or is filtered
1 Address location is valid and will be used in determining whether or not an incoming packet
matches or is filtered
19 MATCHFILT Match or filter bit.
0 The address will be used (if VALID is set) to determine if the incoming packet address should be
filtered
1 The address will be used (if VALID is set) to determine if the incoming packet address is a match
18-16 CHANNEL Channel bit; determines which receive channel a valid address match will be transferred to. The
channel is a don't care if the MATCHFILT bit is cleared to zero.
15-8 MACADDR0 MAC address lower 8 bits (byte 0)
7-0 MACADDR1 MAC address bits 15-8 (byte 1)
SPRU975B – August 2006 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) 129
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