LAN89730 datasheet(137/218 Pages) MICROCHIP

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DS60001348A-page 137

LAN89730

6.3.12

EEPROM COMMAND REGISTER (E2P_CMD)

This register is used to control the read and write operations on the Serial EEPROM.

Address:

030h

Size:

32 bits

Bits

Description

Type

Default

EPC Busy

When a ‘1’ is written into this bit, the operation specified in the EPC Command

field is performed at the specified EEPROM address. This bit will remain set

until the operation is complete. In the case of a read, the host can read valid

data from the E2P Data register. The E2P_CMD and E2P_DATA registers

should not be modified until this bit is cleared. In the case where a write is

attempted and an EEPROM is not present, the EPC Busy remains busy until

the EPC time-out occurs. At that time, the busy bit is cleared.

Note:

EPC busy will be high immediately following power-up, chip-level,

or USB reset. After the EEPROM controller has finished reading (or

attempts to read) the USB Descriptors and Ethernet default register

values, the EPC Busy bit is cleared.

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