Datasheet
2009-2016 Microchip Technology Inc. DS00002306A-page 19
LAN9514/LAN9514I
3.0 EEPROM CONTROLLER (EPC)
LAN9514/LAN9514i may use an external EEPROM to store the default values for the USB descriptors and the MAC
address. The EEPROM controller supports most “93C46” type EEPROMs. A total of nine address bits are used to sup-
port 256/512 byte EEPROMs.
A 3-wire style 2K/4K EEPROM that is organized for 256/512 x 8-bit operation must be used.
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.
3.1 EEPROM Format
Table 3-1 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: For Device Descriptors, the only valid values for the length are 0 and 18.
Note: For Configuration and Interface Descriptors, the only valid values for the length are 0 and 18.
Note: The EEPROM programmer must ensure that if a String Descriptor does not exist in the EEPROM, the ref-
erencing descriptor must contain 00h for the respective string index field.
Note: If no Configuration Descriptor is present in the EEPROM, then the Configuration Flags affect the values of
bmAttributes and bMaxPower in the Ethernet Controller Configuration Descriptor.
Note: If all String Descriptor lengths are zero, then a Language ID will not be supported.
TABLE 3-1: 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