REF: BBONEBLK_SRM
BeagleBone Black System
Reference Manual
Rev A5.2
Page 30 of 108
5.2
Processor
For the initial release, the board uses the Sitara XAM3359AZCZ processor in the 15x15
package. This is basically the same processor as used on the original BeagleBone. It does
use the updated 2.0 revision with several fixes on this new processor as opposed to the
original BeagleBone. A couple of important features from this new processor include:
1GHZ Operation
RTC fix
Eventually the board will move to the Sitara AM3358
B
ZCZ100 device once released and
readily available from TI. At this time we do not have a date when this will happen. We
do not expect any benefit from moving to this device and there should be no impact seen
as a result of making this move,
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
the MT41K512M16HA-125 from Micron. It will operate at a clock frequency of
303MHz yielding an effective rate of 606MHZ on the DDR3L bus allowing for
1.32GB/S of DDR3L memory bandwidth.
5.3.2
32KB EEPROM
A single 32KB EEPROM is provided on I2C0 that holds the board information. This
information includes board name, serial number, and revision information. This will be
the same as found on the original BeagleBone. It has a test point to allow the device to
be programmed and otherwise to provide write protection when not grounded.
5.3.3
2GB Embedded MMC
A single 2GB 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 for SD card booting.
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
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