- Standard Microsystems Single-Chip Ethernet Controller Specification Sheet

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
Revision 1.22 (09-25-08) 36 SMSC LAN9420/LAN9420i
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.
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.
Figure 3.12 EEPROM READ Cycle
Figure 3.13 EEPROM WRITE Cycle
110A6
EECS
EECLK
EEDIO (OUTPUT)
A0
D7 D0
EEDIO (INPUT)
t
CSL
0
EECLK
EEDIO (INPUT)
EEDIO (OUTPUT)
EECS
11A6 A0 D7 D0
t
CSL