LAN9115 datasheet(83/114 Pages) MICROCHIP

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DS00002269A-page 83

LAN9115

Table 5-7 below illustrates the byte ordering of the ADDRL and ADDRH registers with respect to the reception of the

Ethernet physical address. Also shown is the correlation between the EEPROM addresses and ADDRL and ADDRH

registers.

As an example, if the desired Ethernet physical address is 12-34-56-78-9A-BC, the ADDRL and ADDRH registers would

be programmed as shown in Figure 5-2. The values required to automatically load this configuration from the EEPROM

are also shown.

5.4.4

HASHH—MULTICAST HASH TABLE HIGH REGISTER

The 64-bit Multicast table is used for group address filtering. For hash filtering, the contents of the destination address

in the incoming frame is used to index the contents of the Hash table. The most significant bit determines the register

to be used (Hi/Low), while the other five bits determine the bit within the register. A value of 00000 selects Bit 0 of the

Multicast Hash Table Lo register and a value of 11111 selects the Bit 31 of the Multicast Hash Table Hi register.

If the corresponding bit is 1, then the multicast frame is accepted. Otherwise, it is rejected. If the “Pass All Multicast” (MCPAS)

bit is set (1), then all multicast frames are accepted regardless of the multicast hash values.

The Multicast Hash Table Hi register contains the higher 32 bits of the hash table and the Multicast Hash Table Low

TABLE 5-7:

ADDRL, ADDRH AND EEPROM BYTE ORDERING

EEPROM ADDRESS

ADDRN

ORDER OF RECEPTION ON ETHERNET

0x01

ADDRL[7:0]

1st

0x02

ADDRL[15:8]

2nd

0x03

ADDRL[23:16]

3rd

0x04

ADDRL[31:24]

4th

0x05

ADDRH[7:0]

5th

0x06

ADDRH[15:8]

6th

FIGURE 5-2:

EXAMPLE ADDRL, ADDRH AND EEPROM SETUP

Note:

By convention, the left most byte of the Ethernet address (in this example 0x12) is the most significant byte

and is transmitted/received first.

Offset:

Attribute:

R/W

Default Value:

00000000h

Size:

32 bits

Bits

Description

31-0

Upper 32 bits of the 64-bit Hash Table

0x12

0x34

0x56

0x78

ADDRL

0x9A

0xBC

ADDRH

0xA5

0x12

0x34

0x56

0x78

0x9A

0xBC

0x00

0x01

0x02

0x03

0x04

0x05

0x06

EEPROM

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