Texas Instruments TMS320DM646x 사용자 설명서
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5.43 MAC Address Low Bytes Register (MACADDRLO)
Ethernet Media Access Controller (EMAC) Registers
The MAC address low bytes register used in address matching (MACADDRLO), is shown in
and described in
.
Figure 83. MAC Address Low Bytes Register (MACADDRLO)
31
21
20
19
18
16
Reserved
VALID
MATCHFILT
CHANNEL
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; -x = value is indeterminate after reset
Table 82. 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.
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.
matches or is filtered.
19
MATCHFILT
Match or filter bit
0
The address will be used (if the VALID bit is set) to determine if the incoming packet address
should be filtered.
should be filtered.
1
The address will be used (if the VALID bit is set) to determine if the incoming packet address is a
match.
match.
18-16
CHANNEL
0-7h
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 0.
channel is a don't care if the MATCHFILT bit is cleared to 0.
15-8
MACADDR0
0-FFh
MAC address lower 8 bits (byte 0)
7-0
MACADDR1
0-FFh
MAC address bits 15-8 (byte 1)
120
Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)
SPRUEQ6 – December 2007