16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
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.
tCSL
EECS
EECLK
1
0
0
0
0
EEDIO (OUTPUT)
EEDIO (INPUT)
Figure 3.5 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.
tCSL
EECS
EECLK
1
0
0
1
1
EEDIO (OUTPUT)
EEDIO (INPUT)
Figure 3.6 EEPROM EWEN Cycle
SMSC LAN9217
33
Revision 1.8 (06-06-07)
DATASHEET
SMSC [ SMSC CORPORATION ]
