LAN7500-ABZJ

Manufacturer Part NumberLAN7500-ABZJ
DescriptionIC USB-10/100/1K ETH CTRL 56QFN
ManufacturerSMSC
LAN7500-ABZJ datasheets
 


Specifications of LAN7500-ABZJ

Mfg Application NotesLAN7500 SchematicDesign ResourcesLAN7500 BOM
Controller TypeEthernet Controller, USB 2.0 to 10/100/1KInterfaceUSB/Serial
Voltage - Supply1.2V, 2.5V, 3.3VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case56-VFQFN Exposed Pad
Lead Free Status / RoHS StatusLead free / RoHS CompliantCurrent - Supply-
Other names638-1108  
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Hi-Speed USB 2.0 to 10/100/1000 Ethernet Controller
Datasheet
Chapter 3 EEPROM Controller (EPC)
LAN7500/LAN7500i may use an external EEPROM to store the default values for the USB descriptors
and the MAC address. The EEPROM controller supports most “93C56 or 93C66” type 256/512 byte
EEPROMs. A total of nine address bits are used for connection to the device.
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 device’s MAC
address 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 device’s 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 the device descriptor, the only valid values for the length are 0 and 18.
Note: For the configuration and interface descriptor, 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 referencing descriptor must contain 00h for the respective string index field.
Note: If all string descriptor lengths are zero, then a Language ID will not be supported.
EEPROM ADDRESS
00h
A5h (EEPROM Programmed Indicator)
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 0
0Ah
Language ID Descriptor [7:0]
SMSC LAN7500/LAN7500i
Table 3.1 EEPROM Format
EEPROM CONTENTS
19
DATASHEET
Revision 1.0 (11-01-10)