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Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 148 SMSC LAN9311/LAN9311i
DATASHEET
10.2.3.5 EWEN (Erase/Write Enable)
This command enables the EEPROM for erase and write operations. The EEPROM will allow erase
and write operations until the EWDS command is sent, or until power is cycled.
Note: The EEPROM will power-up in the erase/write disabled state. Any erase or write operations
will fail until an EWEN command is issued.
10.2.3.6 READ (Read Location)
This command will cause a read of the EEPROM location pointed to by the EPC_ADDRESS field of
the EEPROM Command Register (E2P_CMD). The result of the read is available in the EEPROM Data
Register (E2P_DATA).
Figure 10.10 EEPROM EWEN Cycle
Figure 10.11 EEPROM READ Cycle
01011
EECLK
EEDI
EEDO
EECS
110Ax A0
D7 D0
EECLK
EEDI
EEDO
EECS