lan9513 Standard Microsystems Corp., lan9513 Datasheet - Page 20

• Manufacturer Part Number: lan9513
• Description: Usb 2.0 Hub And 10/100 Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

Chapter 3 EEPROM Controller (EPC)
Revision 1.0 (11-24-09)
3.1
EEPROM ADDRESS
EEPROM Format
00h
01h
02h
03h
04h
05h
06h
07h
08h
LAN9513/LAN9513i 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 support 256/512 byte EEPROMs.
Note: 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 registers. 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.
Table 3.1
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
Note: If no Configuration Descriptor is present in the EEPROM, then the Configuration Flags affect
Note: If all String Descriptor lengths are zero, then a Language ID will not be supported.
EEPROM, the referencing descriptor must contain 00h for the respective string index field.
the values of bmAttributes and bMaxPower in the Ethernet Controller Configuration Descriptor.
illustrates the format in which data is stored inside of the EEPROM.
0xA5
MAC Address [7:0]
MAC Address [15:8]
MAC Address [23:16]
MAC Address [31:24]
MAC Address [39:32]
MAC Address [47:40]
Full-Speed Polling Interval for Interrupt Endpoint
Hi-Speed Polling Interval for Interrupt Endpoint
Table 3.1 EEPROM Format
DATASHEET
20
EEPROM CONTENTS
USB 2.0 Hub and 10/100 Ethernet Controller
SMSC LAN9513/LAN9513i
Datasheet