lan9313 Standard Microsystems Corp., lan9313 Datasheet - Page 102

• Manufacturer Part Number: lan9313
• Description: Lan9313/lan9313i Three Port 10/100 Managed Ethernet Switch With Mii
• Manufacturer: Standard Microsystems Corp.

Revision 1.2 (04-08-08)
8.2.1
EEPROM Controller Operation
I
(E2P_CMD)
In Microwire EEPROM mode, the following operations are supported:
Note: In I
Note: The EEPROM Loader uses the READ command only.
The supported commands of each mode are detailed in
Register (E2P_CMD)," on page
Microwire) are explained in
respectively.
When issuing a WRITE, or WRAL command, the desired data must first be written into the
Data Register
EPC_COMMAND field of the
value. If the operation is a WRITE, the EPC_ADDRESS field in the
(E2P_CMD)
bit of the
when the EPC_BUSY bit is cleared.
When issuing a READ command, the EPC_COMMAND and EPC_ADDRESS fields of the
Command Register (E2P_CMD)
address, respectively. The READ command is executed by setting the EPC_BUSY bit of the
Command Register
bit is cleared, at which time the data from the EEPROM may be read from the
(E2P_DATA).
Other EEPROM operations (EWDS, EWEN, ERASE, ERAL, RELOAD) are performed by writing the
appropriate command into the EPC_COMMAND field of the
(E2P_CMD). The command is executed by setting the EPC_BUSY bit of the
Register
modifying the
Note: The EEPROM device powers-up in the erase/write disabled state. To modify the contents of
If an operation is attempted and the EEPROM device does not respond within 30mS, the
LAN9313/LAN9313i will time-out, and the EPC_TIMEOUT bit of the
(E2P_CMD)
2
C and Microwire master EEPROM operations are performed using the
ERASE (Erase Location)
ERAL (Erase All)
EWDS (Erase/Write Disable)
EWEN (Erase/Write Enable)
READ (Read Location)
WRITE (Write Location)
WRAL (Write All)
RELOAD (EEPROM Loader Reload - See
are supported.
the EEPROM, the EWEN command must first be issued.
EEPROM Command Register (E2P_CMD)
(E2P_CMD). In all cases, the software must wait for the EPC_BUSY bit to clear before
2
C EEPROM mode, only a sub-set of the above commands (READ, WRITE, and RELOAD)
and
must also be set to the desired location. The command is executed when the EPC_BUSY
will be set.
EEPROM Command Register
(E2P_DATA). The WRITE or WRAL command may then be issued by setting the
EEPROM Data Register
(E2P_CMD). The completion of the operation is indicated when the EPC_BUSY
Section 8.2.2, "I2C EEPROM"
EEPROM Command Register (E2P_CMD)
must be configured with the desired command value and the read
160. Details specific to each EEPROM controller mode (I
DATASHEET
102
(E2P_DATA).
(E2P_CMD).
Section 8.2.4, "EEPROM
is set. The completion of the operation is indicated
and
Section 13.1.3.1, "EEPROM Command
Three Port 10/100 Managed Ethernet Switch with MII
Section 8.2.3, "Microwire EEPROM"
EEPROM Command Register
EEPROM Command Register
EEPROM Command Register
EEPROM Command Register
Loader")
to the desired command
EEPROM Data Register
SMSC LAN9313/LAN9313i
EEPROM Command
EEPROM
EEPROM
EEPROM
Datasheet
2
C and