LAN9250 datasheet(296/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 296

 2015 Microchip Technology Inc.

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:

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.

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.

R/W

000b

27:19

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, Host MAC Reset (HMAC_RESET), or a Digital Reset (DIGI-

TAL_RST).

Bits

Description

Type

Default

[30]

[29]

[28]

Operation

000

READ

RESERVED

011

WRITE

RESERVED

111

RELOAD

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