lan9420 Standard Microsystems Corp., lan9420 Datasheet - Page 35

• Manufacturer Part Number: lan9420
• Description: Lan9420/lan9420i Single-chip Ethernet Controller With Hp Auto-mdix Support And Pci Interface
• Manufacturer: Standard Microsystems Corp.

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 1.1 (03-31-08)
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