LAN9353 Datasheet, PDF (359/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
Bits
Description
30:28
EEPROM Controller Command (EPC_COMMAND)
This field is used to issue commands to the EEPROM controller. The
EEPROM controller will execute a command when the EPC_BUSY bit is set.
A new command must not be issued until the previous command completes.
The field is encoded as follows:
[30]
[29]
[28]
Operation
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
READ
RESERVED
RESERVED
WRITE
RESERVED
RESERVED
RESERVED
RELOAD
Note: Only the READ, WRITE and RELOAD commands are valid for I²C mode.
If an unsupported command is attempted, the EPC_BUSY bit will be
cleared and EPC_TIMEOUT will be set.
The EEPROM operations are defined as follows:
READ (Read Location)
This command will cause a read of the EEPROM location pointed to by the EPC_AD-
DRESS bit field. The result of the read is available in the EEPROM Data Register
(E2P_DATA).
WRITE (Write Location)
If erase/write operations are enabled in the EEPROM, this command will cause the
contents of the EEPROM Data Register (E2P_DATA) to be written to the EEPROM
location selected by the EPC_ADDRESS field.
27:19
18
RELOAD (EEPROM Loader Reload)
Instructs the EEPROM Loader to reload the device from the EEPROM. If a value of
A5h is not found in the first address of the EEPROM, the EEPROM is assumed to be
un-programmed and the RELOAD operation will fail. The CFG_LOADED bit indicates
a successful load. Following this command, the device will enter the not ready state.
The Device Ready (READY) bit in the Hardware Configuration Register (HW_CFG)
should be polled to determine then the RELOAD is complete.
RESERVED
EEPROM Loader Address Overflow (LOADER_OVERFLOW)
This bit indicates that the EEPROM Loader tried to read past the end of the
EEPROM address space. This indicates misconfigured EEPROM data.
This bit is cleared when the EEPROM Loader is restarted with a RELOAD
command, or a Digital Reset (DIGITAL_RST).
Type
R/W
RO
RO
Default
000b
-
0b
 2015 Microchip Technology Inc.
DS00001925A-page 359