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EMAC Module Registers

31.5.43 MAC Address Low Bytes Register (MACADDRLO)

The MAC address low bytes register used in receive address matching (MACADDRLO), is shown in

Figure 31-81 and described in Table 31-82.

Figure 31-81. MAC Address Low Bytes Register (MACADDRLO) (offset = 500h)

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 31-82. 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 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)

1631

SPNU562–May 2014 EMAC/MDIO Module

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