LAN9312 datasheet(119/458 Pages) SMSC

119 / 458 page

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

119

Revision 1.2 (04-08-08)

DATASHEET

Destination Address Source Address ……………FF FF FF FF FF FF

00 11 22 33 44 55 00 11 22 33 44 55 00 11 22 33 44 55 00 11 22 33 44 55

…CRC

Note:

The switch fabric must be configured to pass magic packets to the Host MAC for this function

to operate properly.

9.6

Host MAC Address

The Host MAC address is configured via the Host MAC Address Low Register (HMAC_ADDRL) and

Host MAC Address High Register (HMAC_ADDRH). These registers contain the 48-bit physical

address of the Host MAC. The contents of these registers may be loaded directly by the host, or

optionally, by the EEPROM Loader from EEPROM at power-on (if a programmed EEPROM is

detected). The MAC address value loaded by the EEPROM Loader into the Host MAC address

registers (for host packet unicast qualification), is also loaded into the Switch Fabric MAC address

registers (for pause packet / flow control): Switch Fabric MAC Address Low Register

(SWITCH_MAC_ADDRL) and Switch Fabric MAC Address High Register (SWITCH_MAC_ADDRH).

These two sets of registers are loaded simultaneously via the same EEPROM byte addresses.

Table 9.7 below illustrates the byte ordering of the HMAC_ADDRL/SWITCH_MAC_ADDRL and

HMAC_ADDRH/SWITCH_MAC_ADDRH registers with respect to the reception of the Ethernet

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

HMAC_ADDRL/SWITCH_MAC_ADDRL and HMAC_ADDRH/SWITCH_MAC_ADDRH registers.

For example, if the desired Ethernet physical address is 12-34-56-78-9A-BC, the HMAC_ADDRL and

HMAC_ADDRH registers would be programmed as shown in Figure 9.2. The values required to

automatically load this configuration from the EEPROM are also shown.

Table 9.7 EEPROM Byte Ordering and Register Correlation

EEPROM Address

Order of Reception on Ethernet

01h

HMAC_ADDRL[7:0]

SWITCH_MAC_ADDRL[7:0]

1st

02h

HMAC_ADDRL[15:8]

SWITCH_MAC_ADDRL[15:8]

2nd

03h

HMAC_ADDRL[23:16]

SWITCH_MAC_ADDRL[23:16]

3rd

04h

HMAC_ADDRL[31:24]

SWITCH_MAC_ADDRL[31:24]

4th

05h

HMAC_ADDRH[7:0]

SWITCH_MAC_ADDRH[7:0]

5th

06h

HMAC_ADDRH[15:8]

SWITCH_MAC_ADDRH[15:8]

6th

LAN9312 Datasheet(PDF) 119 Page - SMSC Corporation

LAN9312 Datasheet(HTML) 119 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL