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SMSC LAN91C111 32/16/8-Bit Three-In-One Fast Ethernet Controller
Revision 1.0 (08-14-08) 26 SMSC AN 9.6
APPLICATION NOTE
Note: If no EEPROM is connected to the LAN91C111 the ENEEP pin should be grounded and no
accesses to the EEPROM will be attempted. Configuration, Base, and Individual Address
assume their default values upon hardware reset and the CPU is responsible for programming
them for their final value.
Table 4.1 EEPROM MEMORY MAP
4.4.2 Use the Serial EEPROM as an Option
If system designers prefer to use an EEPROM, the minimum size of the EEPROM required is as small
as 1K (64 x 16) to store the above information. If an EEPROM is not present, the LAN91C111 initiates
using 300h as the I/O Base Address. The individual address registers will default to all zeros, but
individual addresses can be programmed by writing a MAC address to the individual address registers
(IAR).