LAN9420 Datasheet, PDF (36/171 Pages) SMSC Corporation – Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

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.
EECS
EECLK
EEDIO (OUTPUT)
EEDIO (INPUT)
1
1
0
A6
A0
D7
Figure 3.12 EEPROM READ Cycle
tCSL
D0
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.
EECS
EECLK
EEDIO (OUTPUT)
EEDIO (INPUT)
tCSL
1
0
1
A6
A0
D7
D0
Figure 3.13 EEPROM WRITE Cycle
Revision 1.6 (07-18-11)
36
DATASHEET
SMSC LAN9420/LAN9420i