LAN9500 Datasheet, PDF (79/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
The MAC address is used as the default Ethernet MAC address and is loaded into the MAC’s ADDRH and ADDRL reg-
isters. If a properly configured EEPROM is not detected, it is the responsibility of the Host LAN Driver to set the IEEE
addresses.
After a system-level reset occurs, the device will load the default values from a properly configured EEPROM. The
device will not accept USB transactions from the Host until this process is completed.
The EEPROM controller also allows the Host system to read, write and erase the contents of the Serial EEPROM.
5.7.1 EEPROM FORMAT
Table 5-57 illustrates the format in which data is stored inside of the EEPROM.
Note the EEPROM offsets are given in units of 16-bit word offsets. A length field with a value of zero indicates that the
field does not exist in the EEPROM. The device will use the field’s HW default value in this case.
Note 1: For the device descriptor, the only valid values for the length are 0 and 18.
2: For the configuration and interface descriptor, the only valid values for the length are 0 and 18.
3: The EEPROM programmer must ensure that if a string descriptor does not exist in the EEPROM, the refer-
encing descriptor must contain 00h for the respective string index field.
4: If all string descriptor lengths are zero, then a Language ID will not be supported.
TABLE 5-57: EEPROM FORMAT
EEPROM Address
EEPROM Contents
00h
0xA5
01h
MAC Address [7:0]
02h
MAC Address [15:8]
03h
MAC Address [23:16]
04h
MAC Address [31:24]
05h
MAC Address [39:32]
06h
MAC Address [47:40]
07h
Full-Speed Polling Interval for Interrupt Endpoint
08h
Hi-Speed Polling Interval for Interrupt Endpoint
09h
Configuration Flags
0Ah
Language ID Descriptor [7:0]
0Bh
Language ID Descriptor [15:8]
0Ch
Manufacturer ID String Descriptor Length (bytes)
0Dh
Manufacturer ID String Descriptor EEPROM Word Offset
0Eh
Product Name String Descriptor Length (bytes)
0Fh
Product Name String Descriptor EEPROM Word Offset
10h
Serial Number String Descriptor Length (bytes)
11h
Serial Number String Descriptor EEPROM Word Offset
12h
Configuration String Descriptor Length (bytes)
13h
Configuration String Descriptor Word Offset
14h
Interface String Descriptor Length (bytes)
15h
Interface String Descriptor Word Offset
16h
Hi-Speed Device Descriptor Length (bytes)
17h
Hi-Speed Device Descriptor Word Offset
18h
Hi-Speed Configuration and Interface Descriptor Length (bytes)
19h
Hi-Speed Configuration and Interface Descriptor Word Offset
1Ah
Full-Speed Device Descriptor Length (bytes)
1Bh
Full-Speed Device Descriptor Word Offset
1Ch
Full-Speed Configuration and Interface Descriptor Length (bytes)
 2010 - 2015 Microchip Technology Inc.
DS00001875A-page 79