Texas Instruments TMS320DM36X - Manual (Page 119)

www.ti.com Ethernet Media Access Controller (EMAC) Registers
5.43 MAC Address Low Bytes Register (MACADDRLO)
The MAC address low bytes register used in address matching (MACADDRLO), is shown in Figure 82
and described in Table 80 .
Figure 82. 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 80. 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 the VALID bit is set) to determine if the incoming packet address
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.
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.
15-8 MACADDR0 0-FFh MAC address lower 8 bits (byte 0)
7-0 MACADDR1 0-FFh MAC address bits 15-8 (byte 1)
119 SPRUFI5B – March 2009 – Revised December 2010 Ethernet Media Access Controller (EMAC)/Management Data Input/Output
(MDIO)
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