EMAC Module Registers

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5.43 MAC Address Low Bytes Register (MACADDRLO)

The MAC address low bytes register used in address matching (MACADDRLO), is shown in Figure 81 and described in Table 80.

Figure 81. 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-x

 

 

 

R/W-x

 

 

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 channels

 

 

0

Address is not valid and will not be used for matching or filtering incoming packets

 

 

1

Address is valid and will be used for matching or filtering incoming packets

 

 

 

 

19

MATCHFILT

 

Match or filter bit

 

 

0

The address will be used (if the VALID bit is set) to filter incoming packet addresses

 

 

1

The address will be used (if the VALID bit is set) to match incoming packet addresses

 

 

 

 

18-16

CHANNEL

0-7h

Channel select. Determines which receive channel a valid address match will be transferred to. The

 

 

 

channel is a don't care if MATCHFILT is cleared to 0.

 

 

 

 

15-8

MACADDR0

0-FFh

MAC address lower 8-0 bits (byte 0)

 

 

 

 

7-0

MACADDR1

0-FFh

MAC address bits 15-8 (byte 1)

 

 

 

 

120

EMAC/MDIO Module

SPRUFL5B –April 2011

 

 

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Texas Instruments TMS320C674X manual MAC Address Low Bytes Register Macaddrlo, Valid Matchfilt Channel MACADDR0 MACADDR1