User Manual

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5.3 Memory

Described in the following sections are the three memory devices found on the board.

5.3.1 512MB DDR3L

A single 256Mb x16 DDR3L 4Gb (512MB) memory device is used. The memory used is

one of two devices:

- MT41K256M16HA-125 from Micron

- D2516EC4BXGGB from Kingston

It will operate at a clock frequency of 400MHz yielding an effective rate of 800MHZ on the

DDR3L bus allowing for 1.6GB/S of DDR3L memory bandwidth.

5.3.2 4KB EEPROM

A single 4KB EEPROM is provided on I2C0 that holds the board information. This

information includes board name, serial number, and revision information. This is the

not the same as the one used on the original BeagleBone. The device was changed for

cost reduction reasons. It has a test point to allow the device to be programmed and

otherwise to provide write protection when not grounded.

5.3.3 4GB Embedded MMC

A single 4GB embedded MMC (eMMC) device is on the board. The device connects to the

MMC1 port of the processor, allowing for 8bit wide access. Default boot mode for the board

will be MMC1 with an option to change it to MMC0, the SD card slot, for booting from the SD

card as a result of removing and reapplying the power to the board. Simply pressing the

reset button will not change the boot mode. MMC0 cannot be used in 8Bit mode because

the lower data pins are located on the pins used by the Ethernet port. This does not interfere

with SD card operation but it does make it unsuitable for use as an eMMC port if the 8 bit

feature is needed.

5.3.4 MicroSD Connector

The board is equipped with a single microSD connector to act as the secondary boot

source for the board and, if selected as such, can be the primary boot source. The

connector will support larger capacity microSD cards. The microSD card is not provided

with the board. Booting from MMC0 will be used to flash the eMMC in the production

environment or can be used by the user to update the SW as needed.