SAMA5D2 datasheet(21/74 Pages) ATMEL

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SAMA5D2 Xplained Ultra [USER GUIDE]

Atmel-44028C-ATARM-SAMA5D2-Xplained-Ultra-User Guide_13-Oct-16

5.3.6.3

Serial EEPROM with Unique MAC Address

The SAMA5D2-XULT board embeds one Atmel AT24MAC402/602 EEPROM using a TWI1 interface.

The AT24MAC402/602 provides 2048 bits of Serial Electrically-Erasable Programmable Read-Only Memory

(EEPROM) organized as 256 words of eight bits each and is accessed via an I

2C-compatible (2-wire) serial

interface. In addition, the AT24MAC402/602 incorporates an easy and inexpensive method to obtain a globally

unique MAC or EUI address (EUI-48 or EUI-64).

The EUI-48/64 addresses can be assigned as the actual physical address of a system hardware device or node, or

it can be assigned to a software instance. These addresses are factory-programmed by Atmel and guaranteed

unique. They are permanently write-protected in an extended memory block located outside of the standard 2-Kbit

memory array.

In addition, the AT24MAC402/602 provides the value-added feature of a factory-programmed, also guaranteed

unique 128-bit serial number located in the extended memory block (same area as the EUI address values).

Figure 5-17.

EEPROM

WARNING

The EEPROM device is used as a “software label” to store board information such as

chip type, manufacture name and production date, using the last two 16-byte blocks in

memory. The information contained in these blocks should not be modified.

EEPROM_WP

VDD_3V3

EEPROM_TWD1_PD4

[8]

EEPROM_TWCK1_PD5

[8]

R316

U18

AT24MAC402-MAHM-T

GND

VCC

SCL

SDA

C161

100nF

SAMA5D2 датащи(PDF) 21 Page - ATMEL Corporation