lan9420 Standard Microsystems Corp., lan9420 Datasheet - Page 36

• 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
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.
t
CSL
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.
t
CSL
EECS
EECLK
EEDIO (OUTPUT)
1
0
1
A6
A0
D7
D0
EEDIO (INPUT)
Figure 3.13 EEPROM WRITE Cycle
Revision 1.1 (03-31-08)
36
SMSC LAN9420/LAN9420i
DATASHEET