Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Datasheet

READ (Read Location): This command will cause a read of the EEPROM location pointed to by EPC Address (EPC_ADDR). The result of the read is available in the E2P_DATA register.

tCSL

EECS

 

 

 

 

 

 

EECLK

 

 

 

 

 

 

EEDIO (OUTPUT)

1

1

0

A6

A0

 

EEDIO (INPUT)

 

 

 

 

D7

D0

Figure 3.12 EEPROM READ Cycle

WRITE (Write Location): If erase/write operations are enabled in the EEPROM, this command will cause the contents of the E2P_DATA register to be written to the EEPROM location selected by the EPC Address field (EPC_ADDR). The EPC_TO bit is set if the EEPROM does not respond within 30ms.

tCSL

EECS

EECLK

EEDIO (OUTPUT)

1

0

1

A6

A0

D7

D0

EEDIO (INPUT)

Figure 3.13 EEPROM WRITE Cycle

Revision 1.22 (09-25-08)

36

SMSC LAN9420/LAN9420i

 

DATASHEET