LAN9117 Datasheet, PDF (27/114 Pages) SMSC Corporation – HIGH PERFORMANCE SINGLE-CHIP 10/100 NON-PCI ETHERNET CONTROLLER

LAN9117
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 3-6:
EEPROM EWDS CYCLE
t_CSL
EECS
EECLK
EEDIO (OUTPUT)
1
0
0
0
0
EEDIO (INPUT)
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 3-7:
EEPROM EWEN CYCLE
t_CSL
EECS
EECLK
EEDIO (OUTPUT)
1
0
0
1
1
EEDIO (INPUT)
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DS00002267A-page 27