Datasheet

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
Datasheet
SMSC LAN9220 41 Revision 2.9 (03-01-12)
DATASHEET
EWDS (Erase/Write Disable): After issued, the EEPROM will ignore erase and write commands. To
re-enable erase/write operations issue the EWEN command.
Figure 3.13 EEPROM EWDS Cycle
EWEN (Erase/Write Enable): Enables the EEPROM for erase and write operations. The EEPROM
will allow erase and write operations until the “Erase/Write Disable” command is sent, or until power
is cycled.
Note: The EEPROM device will power-up in the erase/write-disabled state. Any erase or write
operations will fail until an Erase/Write Enable command is issued.
Figure 3.14 EEPROM EWEN Cycle
0
EECLK
EEDIO (INPUT)
EEDIO (OUTPUT)
EECS
1000
t
CSL
0
EECLK
EEDIO (INPUT)
EEDIO (OUTPUT)
EECS
1011
t
CSL