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LAN9220 Datasheet(PDF) 97 Page - Microchip Technology

Part # LAN9220
Description  16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
PDF  142 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9220 Datasheet(HTML) 97 Page - Microchip Technology

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 2006-2017 Microchip Technology Inc.
DS00002417A-page 97
LAN9220
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 Table 5-2. The values required to automatically load this configuration from the EEPROM
are also shown.
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.
0x12
0
7
0x34
8
15
0x56
16
23
0x78
24
31
ADDRL
0x9A
0
7
0xBC
8
15
ADDRH
xx
16
23
xx
24
31
0xA5
0x12
0x34
0x56
0x78
0x9A
0xBC
0x00
0x01
0x02
0x03
0x04
0x05
0x06
EEPROM



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