LAN9117_08 Datasheet, PDF (36/136 Pages) SMSC Corporation – High Performance Single-Chip 10/100 Non-PCI Ethernet Controller

High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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.
t_CSL
EECS
EECLK
EEDIO (OUTPUT)
1
0
0
0
0
EEDIO (INPUT)
Figure 3.6 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.
t_CSL
EECS
EECLK
EEDIO (OUTPUT)
1
0
0
1
1
EEDIO (INPUT)
Figure 3.7 EEPROM EWEN Cycle
Revision 1.5 (07-11-08)
36
DATASHEET
SMSC LAN9117