LAN9250 datasheet(290/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 290

 2015 Microchip Technology Inc.

13.4

EEPROM Loader

The EEPROM Loader interfaces to the I2C EEPROM controller, the PHYs and to the system CSRs (via the Register

Access MUX). All system CSRs are accessible to the EEPROM Loader.

The EEPROM Loader runs upon a pin reset (RST#), power-on reset (POR), digital reset (Digital Reset (DIGITAL_RST)

bit in the Reset Control Register (RESET_CTL)) or upon the issuance of a RELOAD command via the EEPROM Com-

mand Register (E2P_CMD). Refer to Section 6.2, "Resets," on page 38 for additional information on resets.

The EEPROM contents must be loaded in a specific format for use with the EEPROM Loader. An overview of the

EEPROM content format is shown in Table 13-3. Each section of EEPROM contents is discussed in detail in the follow-

ing sections.

13.4.1

EEPROM LOADER OPERATION

Upon a pin reset ((RST#), power-on reset (POR), digital reset (Digital Reset (DIGITAL_RST) bit in the Reset Control

(E2P_CMD), the EEPROM Controller Busy (EPC_BUSY) bit in the EEPROM Command Register (E2P_CMD) will be

set. While the EEPROM Loader is active, the Device Ready (READY) bit of the Hardware Configuration Register

(HW_CFG) is cleared and no writes to the device should be attempted. The operational flow of the EEPROM Loader

can be seen in Figure 13-8.

TABLE 13-3:

EEPROM CONTENTS FORMAT OVERVIEW

EEPROM Address

Description

Value

EEPROM Valid Flag

A5h

MAC Address Low Word [7:0]

1st Byte on the Network

MAC Address Low Word [15:8]

2nd Byte on the Network

MAC Address Low Word [23:16]

3rd Byte on the Network

MAC Address Low Word [31:24]

4th Byte on the Network

MAC Address High Word [7:0]

5th Byte on the Network

MAC Address High Word [15:8]

6th Byte on the Network

Configuration Strap Values Valid Flag

A5h

8 - 16

Configuration Strap Values

See Table 13-4

Burst Sequence Valid Flag

A5h

Number of Bursts

See Section 13.4.5, "Register

Data"

19 and above

Burst Data

See Section 13.4.5, "Register

Data"

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