LAN89730 datasheet(139/218 Pages) MICROCHIP

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 2013-2015 Microchip Technology Inc.

DS60001348A-page 139

LAN89730

EPC Time-out

If an EEPROM operation is performed, and there is no response from the

EEPROM within 30 ms, the EEPROM controller will time-out and return to its

idle state. This bit is set when a time-out occurs, indicating that the last opera-

tion was unsuccessful.

Note:

If the EEDI pin is pulled-high (default if left unconnected), EPC

commands will not time out if the EEPROM device is missing. In this

case, the EPC Busy bit will be cleared as soon as the command

sequence is complete. It should also be noted that the ERASE,

ERAL, WRITE and WRAL commands are the only EPC commands

that will time-out if an EEPROM device is not present and the EEDI

signal is pulled low.

R/WC

Data Loaded

When set, this bit indicates that a valid EEPROM was found and that the USB

and Ethernet data programming has completed normally. This bit is set after a

successful load of the data after power-up or after a RELOAD command has

been completed.

R/WC

8:0

EPC Address

The 9-bit value in this field is used by the EEPROM Controller to address a

specific memory location in the Serial EEPROM. This is a byte-aligned

address.

R/W

00h

Bits

Description

Type

Default

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