LAN9313 Datasheet, PDF (202/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

13.1.5.7
Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
Switch Fabric MAC Address Low Register (SWITCH_MAC_ADDRL)
Offset:
1F4h
Size:
32 bits
This register contains the lower 32-bits of the MAC address used by the switch for Pause frames. This
register is used in conjunction with Switch Fabric MAC Address High Register
(SWITCH_MAC_ADDRH). The contents of this register are optionally loaded from the EEPROM at
power-on through the EEPROM Loader if a programmed EEPROM is detected. The least significant
byte of this register (bits [7:0]) is loaded from address 01h of the EEPROM. The most significant byte
(bits [31:24]) is loaded from address 04h of the EEPROM. The Host can update the contents of this
field after the initialization process has completed.
Refer to Section 8.2.4, "EEPROM Loader," on page 113 for information on using the EEPROM Loader.
BITS
DESCRIPTION
31:0 Physical Address[31:0]
This field contains the lower 32-bits (31:0) of the physical address of the
Switch Fabric MACs.
TYPE
R/W
DEFAULT
FF0F8000h
Table 13.2 illustrates the byte ordering of the SWITCH_MAC_ADDRL and SWITCH_MAC_ADDRH
registers with respect to the reception of the Ethernet physical address. Also shown is the correlation
between the EEPROM addresses and the SWITCH_MAC_ADDRL and SWITCH_MAC_ADDRH
registers.
Table 13.2 SWITCH_MAC_ADDRL, SWITCH_MAC_ADDRH, and EEPROM Byte Ordering
EEPROM Address
01h
02h
03h
04h
05h
06h
Register Location Written
SWITCH_MAC_ADDRL[7:0]
SWITCH_MAC_ADDRL[15:8]
SWITCH_MAC_ADDRL[23:16]
SWITCH_MAC_ADDRL[31:24]
SWITCH_MAC_ADDRH[7:0]
SWITCH_MAC_ADDRH[15:8]
Order of Reception on Ethernet
1^st
2^nd
3^rd
4^th
5^th
6^th
For example, if the desired Ethernet physical address is 12-34-56-78-9A-BC, the
SWITCH_MAC_ADDRL and SWITCH_MAC_ADDRH registers would be programmed as shown in
Figure 13.2. The values required to automatically load this configuration from the EEPROM are also
shown.
Revision 1.2 (04-08-08)
202
DATASHEET
SMSC LAN9313/LAN9313i