LAN9514_12 Datasheet, PDF (35/52 Pages) SMSC Corporation – USB 2.0 Hub and 10/100 Ethernet Controller

USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
3.2
EEPROM Defaults
The signature value of 0xA5 is stored at address 0. A different signature value indicates to the
EEPROM controller that no EEPROM or an un-programmed EEPROM is attached to the device. In
this case, the hardware default values are used, as shown in Table 3.11.
Table 3.11 EEPROM Defaults
FIELD
Ethernet Controller
MAC Address
Ethernet Controller
Full-Speed Polling
Interval (mS)
Ethernet Controller
Hi-Speed Polling Interval
(mS)
Ethernet Controller
Configuration Flags
Ethernet Controller
Maximum Power (mA)
Ethernet Controller
Vendor ID
Ethernet Controller
Product ID
DEFAULT VALUE
FFFFFFFFFFFFh
01h
04h
05h
01h
0424h
EC00h
3.3
EEPROM Auto-Load
Certain system level resets (USB reset, POR, nRESET, and SRST) cause the EEPROM contents to
be loaded into the device. After a reset, the EEPROM controller attempts to read the first byte of data
from the EEPROM. If the value 0xA5 is read from the first address, then the EEPROM controller will
assume that the external Serial EEPROM is configured for auto-loading. If a value other than 0xA5 is
read from the first address, the EEPROM auto-load will not commense.
Note:
The EEPROM contents are loaded for both the Hub and the Ethernet Controller as a result of
a POR or nRESET. The USB reset results only in the loading of the MAC address from the
EEPROM. A software reset (SRST) or a EEPROM Reload Command causes the EEPROM
contents related solely to the Ethernet Controller to be loaded.
SMSC LAN9514/LAN9514i
35
DATASHEET
Revision 1.2 (02-29-12)