LAN9313 datasheet(202/398 Pages) SMSC

202 / 398 page

Three Port 10/100 Managed Ethernet Switch with MII

Datasheet

Revision 1.2 (04-08-08)

202

SMSC LAN9313/LAN9313i

DATASHEET

13.1.5.7

Switch Fabric MAC Address Low Register (SWITCH_MAC_ADDRL)

This register contains the lower 32-bits of the MAC address used by the switch for Pause frames. This

re gist er is used in conju n ct ion wit h Swit ch 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.

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.

F o r exa m pl e, if t h e des ired Et he rne t p h ysi cal ad dre ss is 12 -34 - 56 -78 - 9A-B C, th e

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.

Offset:

1F4h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:0

Physical Address[31:0]

This field contains the lower 32-bits (31:0) of the physical address of the

Switch Fabric MACs.

R/W

FF0F8000h

Table 13.2 SWITCH_MAC_ADDRL, SWITCH_MAC_ADDRH, and EEPROM Byte Ordering

EEPROM Address

Order of Reception on Ethernet

01h

SWITCH_MAC_ADDRL[7:0]

1st

02h

SWITCH_MAC_ADDRL[15:8]

2nd

03h

SWITCH_MAC_ADDRL[23:16]

3rd

04h

SWITCH_MAC_ADDRL[31:24]

4th

05h

SWITCH_MAC_ADDRH[7:0]

5th

06h

SWITCH_MAC_ADDRH[15:8]

6th

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