LAN89218 datasheet(97/148 Pages) MICROCHIP

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DS60001255B-page 97

LAN89218

30:28

EPC command. This field is used to issue commands to the EEPROM con-

troller. The EPC will execute commands when the EPC Busy bit is set. A new

command must not be issued until the previous command completes.

This field is encoded as follows:

READ (Read Location): This command will cause a read of the EEPROM

location pointed to by EPC Address. The result of the read is available in the

E2P_DATA register.

EWDS (Erase/Write Disable): After issued, the EEPROM will ignore erase

and write commands. To re-enable erase/write operations issue the EWEN

command.

EWEN (Erase/Write Enable): Enables the EEPROM for erase and write

operations. The EEPROM will allow erase and write operations until the

Erase/Write Disable command is sent, or until power is cycled.

Note:

The EEPROM device will power-up in the erase/write-disabled

state. Any erase or write operations will fail until an Erase/Write

Enable command is issued.

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.

WRAL (Write All): If erase/write operations are enabled in the EEPROM, this

command will cause the contents of the E2P_DATA register to be written to

every EEPROM memory location.

ERASE (Erase Location): If erase/write operations are enabled in the

EEPROM, this command will erase the location selected by the EPC Address

field.

ERAL (Erase All): If erase/write operations are enabled in the EEPROM, this

command will initiate a bulk erase of the entire EEPROM.

RELOAD (MAC Address Reload): Instructs the EEPROM controller to

reload the MAC address from the EEPROM. If a value of 0xA5 is not found in

the first address of the EEPROM, the EEPROM is assumed to be unpro-

grammed and MAC Address Reload operation will fail. The “MAC Address

Loaded” bit indicates a successful load of the MAC address.

R/W

27:10

Reserved

Bits

Description

Type

Default

[30]

[29]

[28]

OPERATION

000

READ

001

EWDS

EWEN

011

WRITE

100

WRAL

ERASE

ERAL

Reload

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