LAN9420-NU Standard Microsystems (SMSC), LAN9420-NU Datasheet - Page 35

• Manufacturer Part Number: LAN9420-NU
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9420-NU

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i
EEDIO (OUTPUT)
EEDIO (INPUT)
EEDIO (OUTPUT)
EEDIO (INPUT)
EWDS (Erase/Write Disable): After issued, the EEPROM will ignore erase and write commands. To
re-enable erase/write operations issue the EWEN command.
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
EECLK
EECS
EECLK
operations will fail until an Erase/Write Enable command is issued.
EECS
1
Figure 3.10 EEPROM EWDS Cycle
Figure 3.11 EEPROM EWEN Cycle
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Revision 1.4 (12-17-08)
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