lan9512 Standard Microsystems Corp., lan9512 Datasheet - Page 32

• Manufacturer Part Number: lan9512
• Description: Usb Hub With Integrated 10/100 Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

Revision 1.0 (04-20-09)
3.2
3.3
EEPROM Defaults
EEPROM Auto-Load
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
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.
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
Table 3.10 EEPROM Defaults
FIELD
DATASHEET
32
DEFAULT VALUE
FFFFFFFFFFFFh
EC00h
0424h
USB Hub with Integrated 10/100 Ethernet Controller
01h
04h
05h
01h
Table
3.10.
SMSC LAN9512
Datasheet